TW201703909A - Power tool with drop arm orbit bracket - Google Patents

Abstract

A power tool assembly includes a drop arm assembly including a drop arm frame and an arbor shaft configured to support a shaping device at least partially above a workpiece support surface, the drop arm assembly configured to move within a drop plane to drop the shaping device completely beneath the workpiece support surface, a belt operably connected to the arbor shaft and configured to rotate the arbor shaft through a slave pulley, the slave pulley having a slave pulley axis of rotation, a motor including a power shaft operably connected to the belt through a motor end pulley, the motor end pulley having a motor end pulley axis of rotation, and an orbit bracket configured to orbitally support the drop arm assembly, the orbit bracket defining a drop arm orbit axis located between the motor end pulley axis of rotation and the slave pulley axis of rotation.

Description

Power tool with steering arm track bracket

This application claims the US Provisional Application No. 62/132,004, which was filed on March 12, 2015 as "TABLE SAW WITH DROPPING BLADE", and the name of the application on March 12, 2015 as "SYSTEM AND METHOD FOR" The disclosure of U.S. Provisional Application No. 62/131,977, the disclosure of which is hereby incorporated by reference in its entirety in its entirety in its entirety in the the the the the the the the the the the the

This invention relates to power tools and, more particularly, to power tools having exposed forming devices.

Many power tools have been produced to facilitate the formation of the workpiece into the desired shape. One of these power tools is a table saw. A wide range of table saws can be used for a variety of purposes. Some table saws, such as cabinet table saws, are very heavy and relatively incapable of moving. Other table saws, sometimes referred to as site table saws, are relatively light. The site table saw is therefore portable so that workers can position the table saw at the work site. Some accuracy is typically sacrificed in making the table saw light enough to be movable. However, the convenience of having the table saw at the work site makes the site table saw very desirable in applications such as general construction projects.

All table saws, including cabinet table saws and site table saws, present a safety concern because the table saw blades are typically very sharp and move at high rates. So, for example, cutting your fingers and deep Severe injuries to the wound can occur almost instantaneously. In response to the hazards inherent in high-speed moving exposed saw blades, many different safety systems have been developed for table saws. One such safety system is a saw blade protector. The blade guard movably encloses the blade, thereby providing a physical barrier that must be moved prior to exposure to the rotating blade. While the blade protector effectively prevents some injury, the blade protector can be removed by the user for convenience of use of the table saw, or because the blade protector is incompatible for use with a particular forming device. By way of example, the blade protector is typically not compatible with the wall panel saw blade and must typically be removed when performing non-cut through.

A table saw security system intended to brake the blade when the user's hand approaches or touches the blade has also been developed. Various brake devices have been developed, including brake devices that are physically inserted into the serrations of the saw blade. However, after actuation of this type of brake device, the saw blade is typically destroyed due to the braking member. In addition, the brake members are typically destroyed. Therefore, whenever the safety device is actuated, a large amount of resources must be consumed to replace the saw blade and the brake member. Another disadvantage of this type of safety device is that the forming device must be toothed. In addition, if the spare blade and brake member are not at hand, the user must travel to the warehouse to obtain a replacement. Therefore, this type of security system can be expensive and inconvenient.

Another type of table saw uses a safety control system that moves the saw blade at the table level in response to the sensed unsafe condition. One such system is disclosed in U.S. Patent No. 8,286,537, issued on October 16, 2012. The '537 patent discloses a power tool comprising: a workpiece support surface; a swing arm assembly movable along a first swing arm position extending over a workpiece support surface in a portion of the forming device supported by the swing arm assembly a portion of the forming device that does not move between the positions of the second swing arm extending above the workpiece support surface; and a latch pin that is engageable in a first position in which the latch pin engages the swing arm assembly Does not swing with the latch The arm assembly moves between the second positions of engagement.

In general, the power tool of the '537 patent operates in a known manner until unsafe conditions are sensed by the safety control system. In response to the sensed unsafe condition, the safety control system controls the pressure operated actuator to force the latch pin from the first position to the second position and force the swing arm assembly away from the first swing arm position and toward the second Swing arm position. Once the movement of the starting saw blade has been cleared, the safety system must be reset.

In view of the foregoing, it would be advantageous to provide a power tool with a safety system that can be easily reset. It is further advantageous to have a special system that does not require special tools to reset the system. A further advantage will be achieved by a safety system that can be reset without extensive disassembly of the power tool.

In one embodiment, a power tool assembly includes: a workpiece support surface; a steering arm assembly including a steering arm frame and a mandrel configured to support a forming device at least partially above the workpiece support surface, The steering arm assembly is configured to move in a falling plane to cause the forming device to completely fall under the workpiece support surface; a belt operatively coupled to the mandrel and configured to rotate the mandrel via a pulley The slave pulley has a slave pulley rotating shaft; a motor including a motor shaft operatively coupled to the belt via a motor end pulley, the motor end pulley having a motor end pulley rotating shaft; and a track bracket The rail structure supports the steering arm assembly, and the rail bracket defines a steering arm rail axis between the motor end pulley rotating shaft and the slave pulley rotating shaft.

In one or more embodiments, the steering arm track axis is lower than the motor end pulley rotation axis.

In one or more embodiments, the track bracket is fixedly attached to a height adjustment frame.

In one or more embodiments, the height adjustment bracket includes a locator pin and an anti-rotation pin, and the track bracket includes an alignment hole defining an aperture axis and configured to receive the locator pin. And extending longitudinally along a slot axis and configured to receive an anti-rotation slot of the counter-rotating pin, and the slot axis is aligned to intersect the bore axis.

In one or more embodiments, the track bracket includes an inner face portion configured to contact the height adjuster, and the inner face defines a non-zero angle with respect to a plane parallel to the drop plane.

In one or more embodiments, the inner face defines an angle of about 0.65° with respect to a plane parallel to the plane of the drop.

In one or more embodiments, the track bracket includes a track axle hole through which a track axle is inserted, the steering arm frame is supported by the track bracket via the track axle track, and the track axle hole A lower portion and an upper portion are formed, the lower portion and the upper portion being configured to form two shoulders extending within the rail shaft bore along an axis defined by the rail shaft bore.

In one or more embodiments, the lower portion is a lower circular portion having a first starting point, the upper portion is an upper circular portion having a second starting point, and the second starting point is from the first Point offset.

In one or more embodiments, the lower portion is a lower circular portion having a first diameter dimension, the upper portion being an upper circular portion having a second diameter size, and the second diameter is The first diameter is different in size.

In one or more embodiments, the power tool assembly includes at least two fixing screws A rod, each of the at least two fixed screws configured to abut the two shoulders to force the track shaft.

In one or more embodiments, the track bracket further includes a pair of aligned apertures to the track axle bore, the track axle including a track axle passing therethrough and aligned with the pair of aligned apertures a hole, and the power tool assembly further includes a track pin extending through the pair of aligned holes and the track shaft hole.

In one embodiment, a method of connecting a power tool assembly to a steering arm assembly, the steering arm assembly including a steering arm frame and a core that is configured to support at least a portion of the forming device above a workpiece support surface a shaft, the steering arm assembly being configured to move in a falling plane to cause the forming device to completely fall under the workpiece support surface, the method comprising defining a pulley for rotating from one of the belts a shaft, defined as a motor end pulley rotating shaft constituting a power shaft operatively coupled to a motor and operatively coupled to one of the motor end pulleys of the belt; and a rotational axis of the pulley at the motor end And a steering arm track axis between the rotating shaft of the pulley, wherein a track bracket is constructed to support the steering arm assembly.

In one or more embodiments, defining the steering arm track axis includes defining a steering arm track axis that is lower than the motor end pulley rotation axis.

In one or more embodiments, defining the steering arm track axis includes fixedly attaching the track bracket to a height mount.

In one or more embodiments, the fixed attachment of the track bracket to a height adjustment bracket includes inserting one of the height adjustment brackets into an alignment hole of one of the rail brackets, An alignment hole defines an aperture axis; and inserting one of the height adjustment brackets with the anti-rotation pin One of the track brackets is counter-rotating in the slot, the counter-rotating slot including a slot axis extending longitudinally along the slot, the slot axis being aligned to intersect the bore axis.

In one or more embodiments, fixedly attaching the track bracket to the height adjustment bracket includes positioning an inner surface portion of the track bracket against the height adjustment bracket, the inner surface defining about being parallel to the drop A non-zero angle of a plane of a plane.

In one or more embodiments, defining the steering arm track axis includes inserting a track axis into one of the track bracket holes and defining a hole defined by the track axis hole and one of the track shaft holes The portion and an upper portion define one of the two shoulder portions extending in axial contact with the inserted track shaft.

In one or more embodiments, defining the steering arm track axis includes urging the track shaft against the two shoulders by at least two fixed screws.

In one or more embodiments, a method of attaching a steering arm assembly includes aligning a track axle bore with a bore aligned with one of the bores of the raceway shaft, and through the pair of aligned bores and the Align the track shaft hole with a track pin.

In one or more embodiments, a method of attaching a steering arm assembly includes compressing a pair of bearings against respective inner bearing walls of the bracket spaced apart from the steering arm frame.

The various embodiments of the invention are described in the drawings and are in the

Figure 1 depicts a top perspective view of a table saw mounted to a wheeled pedestal; Figure 2 depicts the outer cover, swash plate and workpiece removed and having a height adjustment at the upper position A side plan view of the right side of the table saw of Figure 1; Figure 3 depicts a side plan view of the left side of the table saw of Figure 1 with the outer cover, workpiece support surface and sloping plate removed; Figure 4 depicts the table of Figure 1 FIG. 5 depicts a top perspective view of the height adjustment bracket of the saw, the steering arm assembly and the motor assembly; FIG. 5 depicts a top perspective view of the height adjustment bracket of FIG. 4 together with the rod and tube for guiding the movement of the height adjustment bracket; FIG. 6 depicts FIG. Side cross-sectional view of the motor assembly; Figure 7 depicts a plan view of the motor assembly of Figure 4 from the left side of the table saw; Figure 8 depicts the motor assembly as it has been rotated to provide the desired tension to the belt of Figure 4 A plan view of the motor assembly of FIG. 4 on the left side of the table saw; FIG. 9 depicts a side plan view of the track portion of the height adjustment frame of FIG. 4; FIG. 10 depicts an exploded view of the track portion of FIG. 9; A partially exploded view of another exemplary embodiment of a track bracket; FIG. 12A depicts a top plan view of the track bracket of FIG. 12; FIG. 13 depicts FIG. 10 of the support steering arm assembly. Cross-sectional view of the track assembly; Figure 14 FIG. 15A depicts an exploded perspective view of the steering arm assembly of FIG. 4; FIG. 15B depicts a side perspective view of the steering arm assembly of FIG. 4; FIG. 15C depicts the steering arm of FIG. a side plan view; Figure 16 depicts a side view of the right side of the table saw of Figure 1 with the outer cover and workpiece support surface removed Figure 17 depicts a perspective view of a height adjustment bracket having a pyrotechnic assembly and a latch assembly mounted to the height adjustment bracket of Figure 4; Figure 18 depicts a perspective view of the sleeve of Figure 17; Figure 19 and Figure 20 depict Figure 17. FIG. 21 depicts a partial top plan view of the table saw of FIG. 1 with the throat plate removed; FIG. 22 depicts the steering of FIG. 4 showing the common points shared by the center of gravity and the rib of the steering arm frame. Side cross-sectional view of the arm frame; Figure 23 depicts a side perspective view of the pyrotechnic cover mounted to the height mount; Figure 24 depicts an exploded view of the pyrotechnic assembly of Figure 17; Figure 25 depicts the active pellet of Figure 17 with an electrical connector Top plan view; FIGS. 26-29 depict the active pellet of FIG. 17 moving the latch assembly of FIG. 17 when the reaction plug of FIG. 24 is screwed into the pyrotechnic enclosure; FIGS. 30-31 depict The latch assembly of FIG. 17 that biases the active pellet outwardly from the pyrotechnic enclosure when the reaction plug is removed; FIG. 32 depicts a side plan view of the steering arm assembly of FIG. 4 indicating the axes of the various components; FIG. Depicted in the upper part of the height adjustment frame A side plan view of the table saw of Fig. 1 having been offset from the surface to cause the steering arm assembly to fall; Fig. 34 depicts a side view of the table saw of Fig. 1 in which the steering arm assembly is latched and the height adjustment bracket is in the lower position Figure 35 depicts a side plan view of the table saw of Figure 1 having the steering arm assembly dropped against the surface when the height adjustment bracket is in the lower position; Figure 36 depicts a top perspective view of the bounce latch assembly mounted to the height mount; Figures 37-39 depict left, top and right plan views of the height mount showing the ribs to provide increased strength; Figure 40 to Figure 41 depicts a perspective view of a ramp frame showing the ribs to provide increased strength; FIG. 42 depicts a saw control unit assembly mounted to the ramp frame; and FIG. 43 depicts an exploded view of the saw control unit assembly and the ramp frame of FIG. 42; An exploded view of the saw control unit assembly, steering arm assembly and ramp frame of FIG. 42 is depicted; FIG. 45 depicts a side perspective view of a ramp frame showing coaxial wiring for providing communication with various components; FIG. 46 depicts FIG. 47 depicts a perspective view of the connection between the center conductor and the CCP; FIG. 48 depicts a perspective view of the coaxial wiring offset from its normal position, in which the connection is normal. To the protective cover removed to show the beveled frame attached to the exposed shroud of the beveled frame; Figures 49 to 50 depict the stripped portion to cover the coaxial wire and also provide coaxial wires and other groups Protective cover for communication between; FIG. 51 depicts a side perspective view of the table saw of FIG. 1 with the cover removed to show the manner in which the assembly communicates with the shield of the coaxial wiring; FIG. 52 depicts the workpiece support surface and the ramp An exploded view of the electrically isolated trunnion for pivoting the ramp; Figure 53 is a cross-sectional view of the mandrel showing the mandrel and the remainder of the steering arm assembly and the belt being electrically isolated; Figure 54 is an exploded view of the pulley of Figure 53 providing electrical isolation between the belt and the mandrel; Figure 54A is a side plan view of the housing of Figure 54 showing the dovetail; Figure 55 depicts the guiding of carbon dust away from the assembly. A perspective view of a motor assembly of one or more radially-guiding vents; Figure 56 depicts a partial exploded view of the throat plate and workpiece support surface of Figure 1; Figure 57 depicts a knob engagement in which the workpiece support surface is removed Fig. 58 depicts a top perspective view of the knob of Fig. 56; Fig. 59 depicts a side plan view of the front portion of the throat panel; Fig. 60 depicts a partial perspective view of the steering arm assembly, wherein the spindle lock of Fig. 15B engages pyrotechnics The cover is used to maintain the steering arm assembly under latched conditions; Figure 61 depicts a partial top perspective view of the table saw of Figure 1, wherein the throat plate is removed to allow for resetting of the steering arm assembly; Figure 62 depicts Figure 1 A side view of the HMI unit; FIG. 63 depicts an exploded view of the internal components of the HMI unit of FIG. 62; FIG. 64 depicts a plan view of the table saw of FIG. 1 with the ramp frame at zero degrees; FIG. 65 depicts a plan view of the table saw of FIG. Beveled shelf The forty-five degree bevel allows the dust raft to be accessed through the table saw cover, the USB port of the saw control unit assembly is visible; and Figures 66 through 67 depict the protection that can be used to protect the USB port of Figure 65 from improper access. cover.

Throughout the several views, corresponding reference numerals indicate corresponding parts. Similar reference numerals indicate similar parts throughout the several views.

Although the power tools described in this article are susceptible to various modifications and alternatives, Particular embodiments thereof have been shown by way of example in the drawings and will be described in detail herein. However, it should be understood that there is no intention to limit the power tool to the particular form disclosed. Rather, the intention is to cover all modifications, equivalents, and alternatives of the scope of the invention as defined by the appended claims.

Referring to Figure 1, a table saw assembly 100 is shown. The table saw assembly 100 includes a table saw 102 mounted to one of the wheeled pedestals 104. The table saw 102 includes a base outer cover 106 and a workpiece support surface 108. Support surface extensions 110 and 112 are provided to assist in supporting a larger workpiece. A fence 114 is provided to guide the workpiece along the workpiece support surface 108.

A trowel or separator 116 is positioned adjacent to the forming device of the saw blade 118 in this embodiment, the saw blade extending from within the base outer cover 106 above the workpiece support surface 108. The blade guard 120 and the kickback pawl 117 can be attached to the separator 116. The saw blade 118 extends through a slot in the throat plate 122. A human machine interface (HMI) unit 124 is provided at the front portion of the table saw 102.

An angle indicator 130 positioned adjacent to the HMI unit 124 indicates the angle of the saw blade 118 with respect to the workpiece support surface 108. The ramp adjustment lock 132 can be used to establish the angle of the saw blade 118 with respect to the workpiece support surface 108 by pivoting the ramp 134 (shown in FIG. 2) within the base housing 106. The ramp frame 134 is then clamped between the ramp adjustment lock 132 and the ramp clamp 133 (see Fig. 3). As further depicted in FIG. 3, the height adjustment wheel 136 is used to adjust the height of the saw blade 118 above the workpiece support surface 108 (not shown in FIG. 3). The rotation of the height adjustment wheel 136 rotates the helical gear 138 that meshes with the threaded rod 140. Therefore, depending on the direction of the rotational height adjustment wheel 136, the threaded rod 140 is forced to rotate clockwise or counterclockwise.

The threaded rod 140 threadably engages the height adjustment bracket 142. In one embodiment, the threaded rod 140 engages the threaded bushing 152 of the height adjustment bracket 142. So when the threaded rod 140 is rotated When turning, the height adjustment frame 142 is forced to move up and down. The rotation of the height adjustment bracket 142 is blocked by the height adjustment lever 144 and the height adjustment tube 146 that are fixedly attached to the ramp frame 134. Height adjustment bar 144 and height adjustment tube 146 extend through openings 148 and 150 (shown in FIG. 4) in height adjustment bracket 142, respectively.

In order to reduce the weight of the table saw 102, a lightweight material (e.g., aluminum) is used in the manufacture of the height adjustment bracket 142. While effective for reducing weight, aluminum is typically not strong enough to withstand the various forces applied to the height mount 142 without deformation or damage (described more fully below). Accordingly, the powder metallurgy liner 153, shown more clearly in FIG. 5, is provided within the opening 150. The bushing 153 distributes forces equally along the opening 150, thereby reducing the likelihood of damage to the mouth of the opening 150 in particular, which can result in improper "looseness" between the height adjustment bracket 142 and the height adjustment tube 146. open".

Similarly, a powder metallurgy slotted bushing 154 is provided over the mouth 148 to protect the opening 148 from damage from the height adjustment rod 144. In other embodiments, one or more of the bushings 153/154 are replaced by linear bearings or split guide pads. In some embodiments, the ramp 134 is protected by the combination of damping bushings at locations that support the height adjustment rod 144 and/or the height adjustment tube 146.

Returning to FIG. 4, the motor assembly 160 is supported by the height adjustment bracket 142. Motor assembly 160 drives belt 162 via offset drive shaft 164 and motor end pulley 166, which are more clearly shown in FIG. 6, which in one embodiment is fabricated from a conductive material. The offset drive shaft 164 is offset by the gear 170 automatic force shaft 168. Motor assembly 160 is attached to height adjustment bracket 142 in a manner that allows belt 162 to be tensioned without the need for a linear tensioner (as explained with reference to Figure 7).

As shown in Figure 7, by installing separately through the motor gear housing 176 The four screws 172 into which the slots 174 are inserted attach the motor assembly 160 to the height adjustment bracket 142. The mounting slot 174 is oriented to define a motor mounted rotating shaft 178 under the axis of rotation 180 of the power shaft 168, which in turn is below the offset shaft 164. Accordingly, rotation of the lifting screw 182 in threaded engagement with the plate 184 fixedly attached to the height adjustment bracket 142 causes the lifting screw 182 to be pushed to the plate 186 of the motor gear housing 176. In one embodiment, the plate 184 is formed as part of the height adjustment bracket 142 or integrated into the height adjustment bracket 142 as a single unit. Thus, instead, the lifting screw 182 is threadedly engaged with the height adjustment bracket 142. Since the plate 186 that is impacted by the lifting screw 182 is positioned above the motor mounting rotary shaft 178, the motor assembly 160 is rotated from the position of FIG. 7 to the position of FIG. 8 in the direction of arrow 188.

Returning to FIG. 4, the above movement of the motor assembly 160 causes the motor end pulley 166 attached to the offset drive shaft 164 to move away from the pulley 192 in the direction of arrow 190 away from the steering arm assembly 194. Therefore, the belt 162 is placed under tension. Thus, the motor assembly 160 can be placed in the position of Figure 7 for initial assembly and then pivoted toward the position depicted in Figure 8 to provide the desired tension of the belt 162. This configuration requires less linear stroke than a linear adjustment mechanism to achieve the same tension in a confined space. In other embodiments, a spring loaded actuator replaces the lifting screw 182 to maintain the tension of the belt over time.

The tension of the belt 162 is verified using a belt tension meter inserted through a belt tension take-up 196 (see Fig. 4) in the upper surface of the belt protection cover 198. The positioning of the access pocket 196 on the upper surface of the belt protection cover 198 allows the belt 162 to be received from above the table saw 102. This allows for easier setting of the tension of the belt while maintaining the structural requirements for the height adjustment bracket without turning the saw upside down to enable access to the belt 162. Although depicted as a circular opening, in other embodiments the access pockets 196 are of different geometries, and in some embodiments, have a removable plug Plug or get started.

Continuing with FIG. 4, the steering arm assembly 194 is movably coupled to the height adjustment bracket 142 by a track axle 200 that defines a steering arm track axis 201. The track bracket 203, further described with reference to Figures 9-10, controls the position of the steering arm track axis 201 to be located on the rotational axis 202 of the offset drive shaft 164 (see Figure 6) (which is also the rotational axis of the motor end pulley 166). Between the rotating shaft 183 from the pulley 192.

The track bracket 203 includes a track axle bore 204 through which the track axle 200 is inserted. The rail bracket 203 further includes an alignment hole 205 and an anti-rotation groove 206 respectively accommodating the positioner pin 207 and the anti-rotation pin 208 extending from the height adjustment frame 142. The rail bracket 203 is connected to the height adjustment bracket 142 by two screws 210.

The axis 211 of the counter-rotation slot 206 is aligned to intersect the central axis 212 of the alignment aperture 205. Therefore, when the positioner pin 207 and the anti-rotation pin 208 are respectively positioned in the alignment hole 205 and the reverse rotation groove 206, the reverse rotation pin 208 and the reverse rotation groove 206 provide accurate angular positions for alignment. Steering arm track axis 201.

The combination of the track bracket 203 with the counter-rotating slot 206 and the counter-rotating pin 226 enables the use of lightweight materials while providing increased accuracy in positioning the saw blade 118. In some embodiments, the accuracy of the track bracket is achieved using two shoulder screws 213 (see FIG. 11) or alignment pins 214 (FIG. 12) received in corresponding holes (not shown) on the height adjustment bracket 142. Positioning. The alignment of the saw blade 118 is further provided by combining the inner face 228 of the track bracket 203 with an angle 230 about 0.65° parallel to one of the planes of the drop plane (see below and Figure 21). This angle of the inner face provides increased accuracy when positioning the saw blade 118 through various bevel angles, even when the belt 162 is under increased tension.

The increased accuracy in positioning the blade 118 is further provided by the manner in which the steering arm assembly 194 is movably coupled to the height adjustment bracket 142. In particular, as shown in FIG. 13, the track axle 200 is movably supported within the steering arm frame 242 of the steering arm assembly 194 by two bearings 215. The track bolts 232 threadably engage the track shaft 200 and abut the inner bearing wall 234 of the bracket 236 spaced apart from the steering arm frame 242 against the compression bearing 215.

Track pins 216 extend through aligned holes 217, 218, and 219. The bore 218 extends through the track axle 200. The aperture 217 extends through the upper portion of the track bracket 203 and the aperture 219 extends through the lower portion of the track bracket 203. The track axle 200 is thus fixed with respect to the track bracket 203 rail. The two setscrews 220 extend through holes 221 in the lower portion of the track bracket 203 and abut the track axles 200 against the two shoulders 222 of the track axle holes 204 depicted in FIG.

The shoulder 222 is formed in the track shaft hole 204 by forming a circular portion 224 below the track shaft hole 204 and a circular portion 226 above the track shaft hole 204. The diameter of the lower circular portion 224 is substantially the same as the diameter of the orbital shaft 200. The upper circular portion 226 has the same or a different diameter than the lower circular portion 224 in various embodiments. However, the starting point of the upper circular portion 226 is offset from the starting point of the lower circular portion 224 in one direction opposite to the position of the fixed screw 220.

Thus, the upper circular portion 226 provides sufficient clearance for a sliding fit between the track axle 200 and the track axle bore 204. At the same time, the junction of the upper circular portion 226 and the lower circular portion 224 forms a shoulder 222 that extends along the entire length of the rail shaft bore 204. Thus, when the fixed screw 220 is installed, the fixed screw 220 abuts the shoulder 222 against the track shaft 200, thereby forming a "three-point" lock between each of the fixed screws and the shoulder.

In some embodiments, the shoulder is pressed to the steering arm frame by the use of a bearing outer race Replace the two ball bearings in 242. Next, the track shaft 200 is inserted, wherein one side of the track shaft engages the inner race of one of the bearings. The rail bolts are then screwed inside the track shaft from opposite directions of the track shaft to engage the inner races of the other bearings. The track axle and bolt assembly moves the inner races of the two bearings toward each other. In the case where the outer race is fixed in the steering arm and the inner race is pulled together, the internal clearance is minimized, thus reducing or eliminating side-to-side movement due to internal voids of the bearing.

Turning now to Figures 15A-15C, the steering arm assembly 194 is depicted in further detail. As noted above, the pulley 192 is engaged with the belt 162 and is rotatably supported by the steering arm assembly 194. More specifically, the mandrel 240, which is constructed to rotatably support the saw blade 118 (see Fig. 1) from the pulley 192, is rotatably supported. The mandrel 240 is rotatably supported within the steering arm frame 242.

The steering arm frame 242 further includes a spring well 244 (Fig. 15B) that receives a spring 246. Spring 246 is operatively coupled to flange 248 of mandrel lock 250. The spindle lock 250 includes a launch arm 252 positioned above the steering arm frame 242 and a locking ramp 254. The mandrel 240 extends through the mandrel slot 256 and the two shoulder screws 258 extend through the guide slot 260 and threadably engage the steering arm frame 242.

The steering arm assembly 194 includes a capacitive coupling plate (CCP) 262 from which the connector tab 264 extends. The CCP is mounted to the CCP bracket 268 using a screw, illustrating five screws that are the same or different types of screws 266, and three fixed screws 269 that are used to mount the CCP bracket to the steering arm frame 242. The CCP bracket 268 includes a raised lip 270 that is configured to provide electrical isolation between the CCP and the saw blade. Although a single piece of CCP bracket 268 is depicted in the embodiment of Fig. 15a, brackets in other embodiments are formed using a plurality of modules that are not interconnected in some embodiments.

CCP 262 is part of a capacitive sensing system (discussed in further detail below) And manufactured from conductive materials. As more clearly depicted in Figure 15C, the CCP 262 is shaped asymmetrically. Conversely, the centroid of the CCP 262 is displaced toward the track 272 of the steering arm frame 242. This shape provides sufficient capacitance while reducing the inertia of the steering arm assembly 194. In one embodiment, the finishing finish for CCP 262 is treated as a non-conductive coating. Acceptable coatings include manganese phosphate for steel CCP and anodization for aluminum CCP. This thin non-conductive cover provides isolation due to accidental contact between the saw blade and the conductive portion of the CCP during re-cutting due to blade deflection.

The CCP bracket 268 is fabricated from a non-conductive material. In one embodiment, a plastic having a low dielectric constant that is unaffected by water is used to minimize capacitance variations in the system. The CCP bracket 268 is inserted into the steering arm and manually adjusted to the proper distance from the saw blade, and then locked in place by the set screw 269 (see Fig. 15A, only two shown).

In particular, the screw 266 is used to mount the CCP 262 to the CCP bracket 268 by threading the protuberances 271. Optionally, in addition to the screw 266, a fastening element such as a nut (not shown) can be used to mount the CCP 262 to the CCP bracket 268. In another embodiment, the CCP bracket 268 is overmolded to the CCP 262 as a single unit. Therefore, no fastening elements are needed anymore. The protuberance 271 is then inserted into a well 273 formed in the steering arm frame and adjusted to set the CCP 262 at the desired position. Next, the fixing screw 269 is inserted through the hole in the well 273 to engage the protuberance 271.

The protuberance 271 electrically isolates the screw 266 and the CCP 262 from the steering arm frame 242. The raised lip 270 of the CCP bracket 268 surrounds the CCP 262 along the outer edge to protect the CCP 262 from accidental contact with the saw blade during re-cutting.

Continuing with Figure 15C, the track 272 includes a rebounding ledge 274/275 (see also 15A), and a pad 276 is mounted to the lower surface of the steering arm frame 242. As best seen in FIG. 15B, the steering arm assembly 194 further includes two alignment pins 278, a hemispherical impact pin 280, and one of the latch pins 282 supported by the steering arm frame 242.

Referring now to Figure 16, steering arm assembly 194 is maintained in latched position by latch 300. The latch 300 is movably coupled to the pyrotechnic enclosure 322 by a pin 302. Latch 300 (also shown in FIG. 17) includes a latch pin receiving area 304 that engages latch pin 282 in the latched position. The latch 300 further includes two prongs 306. The latch 300 is biased by a spring 308 such that the prong 306 is biased into contact with an actuator that is a pellet 310 in one embodiment.

The pellet 310 is paired with another actuator or pellet 312 by a sleeve 314 as shown in FIG. Bridge 320 engages two of the actuators or pellets 310/312 in sleeve 314.

A sleeve 314 mounted in a pyrotechnic enclosure 322 (also referred to as an actuator housing) is shown in FIG. The pyrotechnic or actuator housing 322 (also shown in Figures 19-20) includes an internal threaded chamber 324, a mounting plate 326, and a fingerboard 328. Lock ramp 364 is located on the upper portion of fingerboard 328. The slit 330 extends along one side of the inner threaded chamber 324 and terminates at the rounded end portion 332. This configuration allows for optimal positioning of the active pellets, as explained further with reference to Figures 21 and 22.

21 depicts a partial top plan view of the table saw 102 with the throat plate 122 removed from the throat opening 334. Visible through the throat opening 334 is a mandrel nut 336 and a saw blade 118 that are mounted to one of the mandrels 240. Portions of steering arm 194 and height adjustment bracket 142 are also visible through throat opening 334. Also depicted in FIG. 21 is a drop plane 338. The drop plane 338 is a plane aligned therewith, wherein the shot 310 is interfaced with the steering arm assembly, and when the saw control system is activated, the steering arm assembly moves along the plane in a substantially parallel manner, as described below Fully discussed. Figure 22 depicts a cross-sectional view of the steering arm assembly 194 taken parallel to the drop plane 338 of FIG.

21 and 22 thus show that the steering arm assembly 194 is configured such that the center of gravity 340 of the steering arm assembly 194 is on the drop plane 338, closest to the drop plane or adjacent the drop plane, such that the force from the pellet to the hemispherical impact The transfer of the pins 280 occurs as close as practicable to the drop plane 338.

Thus, the pyrotechnic enclosure 322 is constructed such that the active pellets are substantially centered in the falling plane 338. This results in reduced stress for the system and reduced down time for the steering arm assembly 194. In addition, inactive pellets are positioned within the active pellet (in the configuration of Figure 21, pellet 312) while the sleeve 314 is maintained in a position that is readily accessible through the throat opening 334. This configuration ensures that the inactive pellet does not interfere with the movement of the steering arm assembly 194.

To further improve the alignment of the active pellets with the hemispherical impact pins 280, the alignment housing 342 is mounted to the pyrotechnic enclosure 322, as shown in FIG. Aligning the outer cover 342 receives the hardened steel alignment pins 278 (Fig. 15B), thereby reducing blade deflection under load and ensuring proper alignment between the active pellets and the hemispherical impact pins 280. Providing the pin 278 in the steering arm assembly 194 further provides enhanced stability of the steering arm frame 242 against side loads or torsional loads that abut the track shaft 200 (Fig. 4). Using a hardened steel pin as an alignment pin extending from the aluminum, the steering arm frame 242 achieves this benefit while allowing for a lightweight/low inertia steering arm frame 242.

Although two pins 278 are shown in Figure 15B, in other embodiments only one is used. However, in another embodiment, one or more protrusions or surfaces are used in the system. Additionally, in some embodiments, the alignment housing is positioned in the steering arm assembly 194 and the hardened steel legs extend from the pyrotechnic housing 322. In other embodiments, the alignment features are integrated into the latch 300 and/or pellets.

The slit 330 in the outer cover 322 receives the bridge 320 of the sleeve 314. The slit 330 thus allows for the incorporation of spare pellets into the sleeve 314. However, the slit 330 weakens the pyrotechnic cover 322. Therefore, support at both the forward and rearward positions with respect to the slit 330 is required to prevent malfunction of the pyrotechnic enclosure 322. When the rear mounting plate 326 is tightly bolted to the height adjustment bracket 142 with two bolts 346 and a pin 348 (shown in Figure 23), the bolting of the forward portion of the pyrotechnic cover 322 will result in unacceptably high stresses. Even in the case where the round end portion 332 which suppresses the crack at the end of the slit 330 is provided. It is for this reason that the fingerboard 328 is used.

As depicted in FIG. 17, the forward portion of the pyrotechnic enclosure 322 is supported by the contact between the fingerboard 328 and the finger ribs 344 on the height adjustment bracket 142. The fingerboard 328 thus shifts the force in the direction of the high temperature point (under the pyrotechnic enclosure 322), but does not limit the pyrotechnic enclosure 322 in any other degree of freedom, which greatly reduces the stress level in this section and allows for self-availability and The lightweight material is used to make a pyrotechnic cover 322. In this embodiment, three fingers are provided. In other embodiments, more or less fingers are provided.

The disclosed pyrotechnic system provides many additional features. By way of example, the pyrotechnic assembly 350 of Figure 24 includes two pellets 310/312. While in some embodiments the saw control system provides electrical inspection to ensure connection of unused pellets, in some embodiments the safety control system is not constructed to ensure proper attachment of the attached pellets to the pyrotechnic enclosure 322. And thus aligned with the hemispherical impact pin 280. However, the pyrotechnic assembly 350 shown in Figure 24 is constructed to ensure that the user does not mistakenly connect the wrong pellets.

24 depicts a pyrotechnic assembly 350 that includes a pyrotechnic enclosure 322, sleeve 314, and pellets 310/312 that have been described above. The pyrotechnic assembly 350 further includes an electrical connector 352, a connecting wire 354, and a reaction plug 356.

Typically, pellets 310/312 and sleeve 314 are provided as a single unit. Additionally, the table saw 102 is provided with a connecting wire 354 that is inserted through the opening 358 of the reaction plug 356, as shown most clearly in FIG. One end of the connecting wire 354 is permanently attached to the saw control unit and the other end is attached to the electrical connector 352.

The pyrotechnic assembly 350 is assembled by providing pellets 310/312 in the sleeve 314. The pellets 310/312 and sleeve 314 are inserted into the pyrotechnic enclosure 322. For the new unit, either of the pellets 310/312 is aligned with the shroud axis 366 and inserted into the inner threaded chamber 324. If the unit has been previously used, the unused pellets are inserted into the inner threaded chamber 324.

Next, the electrical connector 352 is inserted into the plug of the pellets 310/312. The reaction plug 356 is then threaded into the inner threaded chamber 324. Because the electrical connector 352 is larger than the opening 358 (see FIG. 25), if the electrical connector 352 is coupled to the pellet located in the internally threaded chamber 324, only the reaction plug 356 can be threaded into the internally threaded cavity. In chamber 324. The combination of the electrical connector 352 and the mating connector on the pellet thus enables the combination of mechanical/electrical locks as described above.

In other embodiments, the reaction plug 356 and the electrical connector 352 can be replaced by a snap cover or a flashlight cover. Additionally, electrical connector 352 can be omitted in these embodiments and replaced with a simple pigtail connector.

The reaction plug 356 further assists in the latching function of ensuring that the sleeve 314 is sufficiently seated within the pyrotechnic enclosure 322. As shown in Figure 26, the spring 308 biases the latch 300 in a clockwise direction. When the reaction plug 356 is not sufficiently threaded into the inner threaded chamber 324 (as depicted in FIG. 26), the prong 306 forces the pellet 312 upwardly within the internally threaded chamber 324 and the latch 300 Rotate clockwise to a position at which the latch 300 is underneath The lower surface of portion portion 360 is located within the drop path of latch pin 282. Thus, the counterclockwise orbital operation of the steering arm assembly 194 is constrained by contact between any portion of the steering arm assembly and the lower portion 360. Therefore, the latch pin 282 cannot be housed in the latch pin receiving area 304.

By rotating the reaction plug 356 in a direction to further engage the internally threaded chamber 324, the reaction plug 356 is forced against the sleeve 314 or the pellet 310 to abut the pellet 310 or sleeve against the prong 306. 314 afterburner. This forces the spring 308 to compress and rotate the latch in a counterclockwise direction, resulting in the configuration of FIG. In FIG. 27, the counterclockwise orbital operation of the steering arm assembly 194 is still constrained by the contact between the latch pins 282 and the lower surface of the lower portion 360.

Continued rotation of the reaction plug 356 causes the sleeve 314 to seat sufficiently within the internally threaded chamber 324 to further rotate the latch 300 to the configuration of FIG. In FIG. 28, the latch 300 has been rotated such that the side surface of the lower portion 360 is within the drop path of the latch pin 282. Therefore, by causing the steering arm assembly 194 to orbit in the counterclockwise direction, the latch pin 282 presses the side surface of the lower portion 360, so that when the latch pin 282 slides up along the side surface of the lower portion 360, The spring 308 is further compressed and the latch 300 is rotated in a counterclockwise direction.

The continued counterclockwise orbital movement of the steering arm assembly 194 moves the latch pins 282 above the side surfaces of the lower portion 360. Thus, spring 308 causes latch 300 to rotate in a clockwise direction, resulting in the configuration of FIG. In FIG. 29, the latch 300 has been rotated in the clockwise direction such that the latch pin 282 is housed in the latch pin receiving area 304.

Thus, if the reaction plug 356 is not sufficiently threaded into the pyrotechnic enclosure 322, the latch 300 provides mechanical "latching" and the steering arm assembly 194 cannot be raised to the cutting/passing Latch position. Although described with respect to pyrotechnic devices, reaction plugs 356 can be used with any type of actuator to provide both mechanical and electrical latching capabilities.

Reaction plug 356 is typically configured such that it can be easily rotated by hand. In one embodiment, the reaction plug 356 includes a rib 362 (see FIG. 24) that is configured to permit tightening/releasing. The ribs 362 are further configured to allow the reaction plug 356 to be tightened/released by a spanner wrench (not shown). In some embodiments, the reaction plug is a hexagonal plug that can be replaced with a standard hex wrench instead of a spanner wrench. In a further embodiment, a locking feature separate from the reaction plug is provided that requires a tool to allow rotation of the reaction plug. By way of example, the locking feature can be a spring loaded component (ball bearing, spring tab) that operates by propelling a locking tab that requires a screwdriver or similar tool to release. In other embodiments, the holes and the extruded pins are used with a circular reaction plug, which requires a special wrench to tighten and loosen the reaction plug.

Biasing the latch 300 into the active pellet by the spring 308 also assists in the removal of the sleeve 314, as initially explained with reference to FIG. FIG. 30 depicts a sleeve 314 that is sufficiently seated within the pyrotechnic enclosure 322. To remove the sleeve 314, the reaction plug 356 is removed. Because the latch 300 is offset against the active pellet, removal of the reaction plug 356 allows the sleeve 314 to be pushed up to the position depicted in FIG. The user can then grip the upper portion of the sleeve 314 above the inactive pellet instead of pulling the sleeve 314 using the connecting wire 354.

Referring back to FIG. 16, when the active pellet 310 is activated by the saw control system, the pellet 310 applies a force to the steering arm assembly 194 via a hemispherical impact pin 280 that is substantially aligned by the outer cover 322 with the drop plane 338. This force is transferred to the latch pin 282 (see FIG. 29), and the latch pin energizes the latch 300 to compress the spring 308 and move the latch pin receiving portion 304 of the latch 300 out. The drop path of the latch pin 282. Steering arm assembly 194 is then in time The track is moved in the direction of the needle to move the saw blade 118 (see FIG. 2) mounted to the mandrel 240 below the workpiece support surface 104.

As discussed above, the position of the steering arm track axis 201 is controlled to be between the axis of rotation 202 of the offset drive shaft 164 and the axis of rotation of the slave pulley 192. This arrangement provides for increased drop speed of the steering arm assembly 194 and prevents damage or stretching of the belt that would result in degradation of powertrain performance, as explained further with reference to Figures 6, 15A and 32. 32 shows the steering arm track axis 201, the rotating shaft 202 of the offset drive shaft 164, and the rotating shaft 183 from the pulley 192. Since the motor end pulley 166 is mounted to the height adjustment bracket 142 and mounted from the pulley 192 to the steering arm assembly 194, the tensioning of the belt 162 as described above moves the motor end pulley 166 away from the steering arm track axis 201 (in the figure) 32 to the left). As a result, the pulley 192 moves toward the motor end pulley 166 during the falling of the steering arm. Thus, the axis 183 moves closer to the axis 202. This reduction in distance causes the belt to slack, which results in a faster drop time.

The impact portion of the steering arm assembly 194 is absorbed by the contact between the pad 276 and the surface 374, as shown in FIG. The liner 276 is mounted to the steering arm assembly 194 using any desired mounting means such as glue, fasteners, splints, and the like. Positioning the pad 276 on the steering arm assembly 194 allows for a pad of a smaller geometry than when the pad is mounted on the surface 374.

For example, FIG. 33 depicts the location of the impact between the steering arm assembly 194 and the surface 374 when the height adjustment bracket 142 is initially in the fully elevated position as depicted in FIG. When the height adjustment bracket 142 is in the lowest position as depicted in FIG. 34, the steering arm assembly 194 contacts the surface 374 at the lower position, as depicted in FIG. Thus, covering the traverse of the surface 374 that is contacted by the steering arm assembly 194 would require more material than would be required to cover the portion of the contact surface 374 of the steering arm assembly 194. Therefore, mounting the spacer 276 on the steering arm assembly 194 reduces the need The amount of gasket material.

The configuration of the steering arm frame 242 is thus selected in part to provide the desired surface for the contact surface 374. Returning to Figure 22, the configuration of the steering arm frame 242 is further selected to reduce the weight of the steering arm frame 242. As depicted in FIG. 22, a plurality of ribs 376/378/380/382 extend from the lower surface 384 to the opening 386 that houses the mandrel 240. The ribs 376/378/380/382 provide strength that allows for the use of less material and/or allows the use of lighter materials. In the case of the steering arm assembly 194, this translates into a reduced moment of inertia, thereby providing a more rapid reduction in the steering arm assembly in response to the sensed unsafe condition.

Once the liner 276 contacts the surface 374, the ribs 376/378/380/382 also reduce the rebound force of the steering arm assembly 194. As shown in Figure 22, the ribs 376/378/380/382 each define a respective axis 388/390/392/394. The axis 388/390/392/394 intersects at location 396, which coincides with the center of gravity 340, is adjacent to the center of gravity, and is closest to the center of gravity. This configuration reduces the bounce energy and allows for a reduction in the amount or weight of the material.

The above configuration is typically insufficient for the dissipation of all of the bounce energy of the steering arm assembly 104. Accordingly, a bounce latch assembly 400 is provided, as shown in FIG. The bounce latch assembly 400 includes a lower latch 402 and an upper latch 404 that are independently movably coupled to the track carrier 203 by pins 406. Pin 406 in some embodiments is sized longer than necessary to provide tolerance. A wave washer (not shown) can be used between the head of the pin 406 and the latch 404 to allow for tolerance while providing the desired tension to the system.

The lower latch 402 and the upper latch 404 are biased into contact with the bounce surface 408 of the steering arm frame 242 by two springs 410 and 412, respectively. Springs 410/412 are anchored to rail bracket 203 by bolts 414. The bounce latch assembly 400 further includes a reset lever 416 from the bottom The portion latch 402 extends to a position above the track bracket 203.

During orbital operation of the steering arm assembly 194 in response to the sensed unsafe condition, the bounce surface 408 orbits in a clockwise direction (as viewed in Figure 36). When the bounce surface 408 is orbiting, the bounce lug 275 (see Figure 15A) orbits through the lower latch 402. Thus, the spring 410 biases the lower latch 402 into contact with the bounce surface 408 at an inwardly accessible position of the rebound lug 275. Subsequently, steering arm assembly 194 contacts surface 374 as described above. When the steering arm assembly 194 bounces away from the surface 374, the lower latch 402 becomes in contact with the rebound lug 275, thereby preventing further upward (counterclockwise) movement of the steering arm assembly 194.

The rebound lug 274 (see Figure 15A) and the upper latch 404 operate similarly. The main difference is that in order for the bounce lug 274 to orbit below the upper latch 404, more clockwise orbiting of the bounce surface 408 is required. This occurs, for example, when positioning the height adjustment bracket 142 toward its highest position, such as the height depicted in FIG. Thus, at a higher position, the bounce protection is provided by the bounce lug 274 and the upper latch 404, while at a lower height (such as the height depicted in Figure 34), the bounce protection is latched by the bounce lug 275 and the lower portion. The device 402 provides.

When the user wishes to return the steering arm assembly 194 to the latched position, the user pushes the reset lever 416 that moves the lower latch 402 away from the bounce surface 408. Additionally, the lip 418 of the lower latch 402 contacts the upper latch 404, thereby moving the upper latch 404 away from the bounce surface 408. The steering arm assembly 194 can then be raised to the latched position held by the latch 300.

The above-described use of the ribs that reduce the weight of the steering arm assembly 194 also reduces the overall weight of the table saw 102, thereby making the table saw 102 more portable. For the same purpose, in other areas of the table saw Use ribs. For example, Figures 37-39 depict various views of the height adjustment bracket 142. A plurality of ribs 420 are provided to accommodate the large impact forces from the pellets 310/312.

Similarly, the ramp 134 includes ribs 422/424/426/428, along with other structural features as depicted in Figures 40-41. Also shown in Figures 40 through 41 are openings 430 and 432. The ribs 424 and 428 provide structural support to the surface 374 that is impacted by the steering arm assembly 194 as discussed above. Ribs 422 and 426 and other structural features provide support that allows for receiving openings 430 and 432. Opening 430 is required to allow installation of motor assembly 160 (Fig. 4), while opening 432 is provided to enhance the operation of the saw control unit, as will be discussed in further detail below. Moreover, the removal of the material forming the opening 432 reduces the weight of the saw.

Thus, in one embodiment, ribs are used throughout the table saw 102 to keep the table saw 102 light and portable without damaging the structure. However, the selective areas and components of the table saw 102 are provided in the form of stronger materials to ensure optimal functioning of the table saw 102, even after multiple fireworks are activated. For example, the impact of the drop is transferred via the steering arm, the track bracket, and into the height adjustment rod. Thus, the track bracket 203 (Fig. 10) and the area of the ramp/height mount around the height adjustment rod are typically formed from a stronger and/or heavier material. Likewise, in some embodiments the alignment housing 342 (FIG. 17), the pyrotechnic housing, and the latch 300 are fabricated from a stronger material, such as by using powder metallurgy, zinc die casting, or the like.

Because many of the structural components are formed from lightweight materials, the forces from the use of pyrotechnics and from the containment steering arm assembly 194 are not hindered. When locating sensitive components, the force of transfer must be considered accordingly. One such sensitive component is received within the saw control unit assembly 450 of Figure 42 that is mounted to the ramp frame 134. The saw control unit assembly 450 includes electronic components for controlling the table saw assembly 100. The electronic components include memory having program instructions stored therein, the programs The instructions control the safety control system when executed by the processor of the saw control unit assembly 450.

As shown in FIG. 43, the saw control unit assembly 450 includes a printed circuit board (PCB) 452 that is mounted to one of the outer shrouds 454. The outer shroud 454 is in turn mounted to the inner shroud 456. The saw control unit assembly 450 is then mounted to the ramp frame 134. Inner housing 456 and outer housing 454 electrically isolate PCB 452 from ramp frame 134. USB port 458 (see Figure 42) provides electronic access to PCB 452.

The aforementioned configuration of the saw control unit assembly 450 provides damping from the use of pyrotechnics and forces from the containment steering arm assembly 194. However, some of the forces may still be transferred to the PCB 452. Thus, if the PCB 452 is mounted perpendicular to any of these force vectors, a large shock/vibration load will be applied to the PCB 452, which can cause damage to the PCB 452. Thus, as best viewed in Figure 44, the PCB 452 is mounted at an angle of about 15 degrees with respect to the plane of the force applied to the pellet and the impact on the surface 374.

If the PCB 452 is mounted in close proximity and parallel to the conductive body of the positive carrying signal (such as a ramp as discussed in further detail below), the signal can be capacitively coupled to the PCB 452 and cause other signals that are not desired by others. Noise. Thus, ramp assembly 134 and saw control unit assembly 450 are configured such that no parallel metal surfaces are present to couple noise to PCB 452. It is for this reason that the opening 432 is provided in the ramp 134.

While it is convenient to mount the PCB 452 on the ramp 134 for the purpose of wire wiring as discussed further below, in some embodiments, the PCB 452 is mounted on the plastic substrate or on the underside of the workpiece support surface. In these embodiments, force transfer and signal coupling are reduced, but wire wiring is typically not optimal. Mounting the PCB 452 to the underside of the workpiece support surface has the use of a workpiece support surface as a heat generating component for the PCB 452 (such as two-way three The additional advantage of the heat sink of the polar body. In another embodiment, an assembly such as a second PCB that generates heat other than the PCB 452 is mounted to the underside of the workpiece support surface and uses the workpiece support surface as a heat sink.

As noted above, for ease of wire routing, the positioning of the saw control unit assembly 450 is selected in one embodiment. The wire harness for one embodiment is depicted in FIG. In FIG. 45, PCB 452 is connected to CCP 262 by coaxial cable 460. The coaxial cable 460 shown in FIG. 46 includes a center conductor 462 insulated from the shroud 464 by an insulator 466. The outer plastic coating 468 protects and insulates the shield 464. As shown most clearly in Figure 47, the center conductor 462 of the coaxial cable 460 is coupled to the connector tab 264 of the CCP 262 to provide a reliable connection that can withstand the impact load of the pyrotechnic ignition event.

Returning to Figure 45, the coaxial cable 460 is coupled to the height adjustment bracket 142 at position 470 and provides sufficient slack in the wire 460 between the position 470 and the connector tab 264 to allow the steering arm assembly 194 to move without The coaxial cable 460 is detached from the connector tab 264.

Coaxial cable 460 is further coupled to ramp mount 134 at locations 472 and 474 and to height mount 142 at location 476. Sufficient slack is provided in the coaxial cable 460 between locations 474 and 476 to allow movement of the height adjustment bracket 142 with respect to the ramp 134.

In various locations, the plastic coating 468 is stripped to expose the shield 464. By way of example, FIG. 48 depicts a stripped region 478 associated with location 474. The stripped zone 478 is placed in direct contact with the ramp 134 at location 474. Typically, a protective cover 480 (see FIG. 49) is then attached over the stripped zone 478 to protect the stripped zone 478 and ensure good contact between the shield 464 and the underlying metal component.

A twin-screw protective cover such as a protective cover 480 can be used depending on the location of the connection Or a single screw protective cover such as the protective cover 482 of FIG. One or more of the protective covers in some embodiments are formed from plastic, while in other embodiments one or more of the protective covers are formed from metal to provide increased connectivity. Alternatively, the coaxial cable shield 464 can be directly soldered to other components or surfaces.

In some embodiments, the only attachment location with a protective cover 480/482 is stripped. Thus, in some embodiments, the cable is stripped at locations 472 and 476 of Figure 45, but the cable is not stripped at location 474.

Thus, the coaxial cable shield 464 can be attached to the metal component in such a manner that the shield 464 can be connected to a plurality of points without termination and also in a manner that provides protection to the coaxial cable 460, wherein the outer plastic coating 468 is stripped. Drop it. This ensures an uninterrupted shroud connection to all metal parts in the lower frame assembly. Coaxial cable 460 is thus used to connect the shroud to ramp mount 134, height mount 142, file 116 and associated components, and the like.

The shroud connection to angle indicator 130 (Fig. 1) is also provided by position 472. As discussed above, position 472 is in electrical communication with ramp frame 134, also shown in FIG. The ramp frame 134 is in turn in electrical communication with the ramp clamp 133. Finally, when the ramp frame 134 is locked by the ramp adjustment lock 132, the ramp clamp 133 is pressed to be in electrical communication with the angle indicator 130. Thus, the angle indicator 130 is placed in electrical communication with the shield 464.

The angle indicator 130 is electrically isolated from the workpiece support surface 108 by a non-conductive front plate 486. This allows the workpiece support surface 108 to be maintained "neutral" when the angle indicator 130 is at the "shield". In other embodiments, the electrical isolation is provided by a plastic isolator attached as a table by using an all-plastic front panel or a plastic front panel having a small insert for bevel clamping, or by using a beveled lock All metal of non-conductive isolators for workpieces and workpiece support surfaces Ger. If desired, the workpiece support surface 108 can be connected to ground to reduce interference from the static electricity to the sensing system. Static electricity from the saw blade and components connected to the shroud can be improved by connecting their components to ground via a high resistance cable.

Because the ramp frame 134 is suspended from the workpiece support surface 108, the support mechanism must also be insulated. As shown in FIG. 52, the ramp frame 134 includes a pair of beveled trunnions 488 (only one of which is visible in FIG. 52) that are pivotally supported by the trunnion block 490 by attachment to one of the workpiece support surfaces 108. . The trunnion block 490 is insulated from the beveled trunnion 488 by a pair of plastic trunnion inserts 492.

In some embodiments, the angle indicator 130 is coupled to the shroud, alternatively or additionally, via a ramp 134 or height adjustment bracket 142. By way of example, FIG. 45 shows a ramp 134 attached to the "shield" at locations 472 and 476. Electrical communication with locations 472 and 476 may be provided via a powder metallurgy bracket 496 (see FIG. 51) in electrical communication with the height adjustment rod 484 and/or via a threaded rod bracket 498 in electrical communication with the height adjustment rod 484. Thus, while the PM brackets 496/498 provide additional strength to allow other portions of the table saw 102 to be fabricated from lightweight metal, they can also provide good electrical communication between the components.

As indicated above, the height adjustment bracket 142 is coupled to the shroud 464. The steering arm frame 242 is in turn in electrical communication with the height adjustment bracket 142 via the track bracket 203. Thus, the mandrel 240 and the saw blade 118 are electrically isolated from the steering arm frame 242. As shown in FIG. 53, the mandrel 240 and the steering arm frame 242 are electrically isolated from the plastic bearing housing 500 that receives the bearing 501 of the blade side 502 of the support mandrel 240. The pulley side 504 of the mandrel 240 is supported by a bearing unit 506. The steering arm frame 242 includes a plastic overmold 508 that supports one of the rear bearings 510. Accordingly, the saw blade 118 and the mandrel 240, the spindle nut 336, and the blade washers 512/514 are each electrically isolated from the steering arm frame 242. In an alternate embodiment, the bearing 510 is isolated by a component (not shown), which may be by press fit, adhesive, overmolded or His technique incorporates the assembly into the rear bearing 510. As an example, the bearing can be fabricated from a non-conductive material such as a ceramic material.

The mandrel 240 is further electrically isolated from the pulley 192 from the conductive belt 162 (Fig. 15A). As depicted in Figures 53 and 54, the pulley 192 includes an inner core 520, an intermediate core 522, and a housing 524. A shim 526 is provided between the mandrel 240 and the shim lip 528 within the motor end pulley 166. In another embodiment, more than one shim can be used in the system. The lock nut 530 is maintained from the pulley 192 on the mandrel 240.

Shim 526 provides a correct alignment between pulley 192 and pulley 166. Motor end pulley 166 is attached to motor assembly 160. The driven pulley 192 is attached to the steering arm assembly 194. Due to the increased tolerance, the two pulleys 192/166 can be offset. Thus, in this embodiment, one of the pulleys is fixed and the other is adjustable. Although a shim is used in the embodiment of Fig. 53, in other embodiments, the shim is replaced by a slip collar or a collar that can be adjusted by turning on an external thread. Further embodiments incorporate an adjustable collar, a movable collar with a lifting screw in the pulley, an inclined plane on the pulley and the shaft, a c-ring instead of a locking nut, an adjustable multi-plate pulley or based on an actual shaft Offset measurements use different sizes of pulleys.

Returning to Figure 54, the inner core 520 is wear resistant and can be fabricated from a conductive material. The inner core 520 includes an aperture 532 that is configured to couple with the mandrel 240, such as by threaded engagement. Other engagement methods can also be used, such as splines, keys, press fit connections, or the like. The outer casing 524 is also wear resistant and can be fabricated from a conductive material. The outer casing 524 includes an outer surface 534 that is constructed to engage the engagement belt 162.

The intermediate core 522 is formed from a non-conductive material, which in one embodiment is an insert molded plastic. Inner surface 536 of inner core 520 and inner surface 538 of outer casing 524 Features that prevent the intermediate core 522 from sliding about the inner core 520 or outer casing 524. Features include, but are not limited to, embossing, splines, tails, protruding structures, anti-sliding structures, locking structures, or the like.

As depicted in Figure 54A, the outer casing 524 in this embodiment includes a dovetail spline 540. The outside shows an angle 542 of about 6°. This provides increased locking, which is beneficial when using materials that exhibit different thermal expansion and shrinkage characteristics. Thus, when the intermediate core 522 is formed, the complementary dovetail structure is formed in the intermediate casing as depicted in FIG. Thus, the outer assembly of the pulley and the inner assembly define a plurality of dovetail connections therebetween.

In other embodiments, all plastic pulleys, anodized aluminum pulleys, or plastic overmolded pulleys are used to provide electrical isolation between the mandrel 240 and the belt 162.

In some embodiments, a non-conductive belt is used in place of the conductive belt 162. In this embodiment, the conductive pulleys are available for use with non-conductive belts. In another embodiment, the conductive belt can be used with a conductive pulley and a non-conductive pulley.

The motor assembly 160 shown in FIG. 6 is thus isolated from the mandrel 240 by the pulley 192. As depicted in FIG. 6, motor assembly 160 is further isolated by a motor end pulley 166 that is similarly fabricated from pulley 192, with a non-conductive intermediate core 580 between inner core 582 and outer casing 584.

While the motor assembly 160 is thus electrically isolated from the mandrel 240 and the saw blade 118, the motor is capable of electromagnetic interference. Thus, the motor assembly 160 is constructed to reduce the potential transmission of interfering electromagnetic energy. As depicted in FIG. 6, power shaft 168 is radially supported within housing 586 by bearings 588. The other end of the power shaft 168 is radially supported by the bearing 590 within the motor gear housing 176. The offset drive shaft 164 including the gear 170 is radially supported by the bearing 592 within the motor gear housing 176. Bearing 594 is supported by cover plate 596. A cover plate 596 is attached to the motor gear housing 176 and encloses the gear 170 and positions the gear 170 to be driven by the armature pinion.

If all of the foregoing components are fabricated from metal, the motor assembly 160 will act like an antenna and transmit noise that can interfere with the sensing system. Specifically, the offset drive shaft 164 (also referred to as a gear shaft) and the bearings 588, 590, 592, and 594 transmit noise, if coupled to, for example, the motor gear housing 176, the motor housing 586, or the cover 596. For large components, the noise will be transmitted in the vicinity of the sensing system (if their components are manufactured from metal). To reduce interference with the sensing system, the motor gear housing 176, housing 586, and cover 596 are thus fabricated from plastic, thereby significantly reducing the noise transmitted by the motor assembly 160. In an alternative embodiment, the non-metallic barrier is positioned between the shaft/bearing and the cover/gear housing.

In addition to interference from electrical noise, the motor assembly 160 also produces carbon dust that can interfere with the operation of the sensing system including the CCP 262. For example, carbon dust from a universal motor brush can be deposited on the assembly and can form a conductive path that will affect the sensing system. Thus, unlike a typical motor housing, the motor gear housing 176 is provided with a plurality of radial vents 610 (as shown in Figure 55). The radial vent 610 splits the cooling air axially driven by the fan 612 (see Figure 6) and splits the air radially. Thus, any carbon entrainment within the fan driven air is forced away from the electrical isolation assembly including the CCP 262, thereby reducing the likelihood of carbon dust depositing between the isolated components.

In some embodiments, an additional reduction in electrical noise interference is achieved by incorporating an electronically commutated motor instead of an AC universal motor. The electronically commutated motor provides a more consistent noise level that is easier to mitigate and reduces the amount of noise generated. Other noise reduction features include the combination of ceramic bearings instead of plastic bearing isolators, such as partial isolation of saw blades by use of non-conductive blade washers, isolation of gears to pulley shafts from thermosets or thermoplastics, and non-conductive coupling. Combine the shaft on the shaft, incorporate some of the non-conducting mandrels or use an aluminum gear housing with isolated bearings.

The fence 114 of Figure 1 is also constructed to reduce potential interference with the sensing system. specific In other words, the fence 114 is removably and movably attached to the rails 620/622 that are mounted to the workpiece support surface 108. The fence 114 is in electrical communication with the workpiece support surface 108 as appropriate. Because the fence 114 is movable, the fence can be in contact with the blade 118 or the file 116 (or associated jaw). To reduce the likelihood of unintentional contact that can affect the sensing system, the sides and top portions of the body portion of the fence 114 are formed with the isolation assemblies 624, 626, 628, respectively. This allows the inner component and the end portion of the fence 114 to be formed from metal.

In one embodiment, one or more of the isolation assemblies 624, 626, 628 can be removed and reinstalled by the user to allow the use of custom fixtures or fixtures by the tool. In another embodiment, a single isolation component is used. An isolation component can be "U" shaped to cover all three surfaces or only one side of the fence.

In other embodiments, the body portion of the fence is overmolded with a barrier material. In some embodiments, the file and associated jaws are isolated from the shield or formed from a non-conductive material. In some embodiments, the isolation assembly 628 is omitted and the recoil pawl has a "lock" feature similar to that associated with an overhead guard that is locked to prevent contact with the top of the fence. In other embodiments, the isolation assembly 628 is omitted and the fence is configured to extend only across the workpiece support surface 108 to a position where it cannot contact the recoil jaws.

The throat plate 122 of Figure 1 is also constructed to reduce electrical interference as explained with reference to Figure 56. The throat plate 122 includes an insert receiving area 640 in which an insert 642 is mounted. The throat plate 122 is configured to fit within the throat opening 334 in the upper surface of the workpiece support surface 108. The throat plate 122 is removably mounted to the workpiece support by first inserting two tabs 646/648 in a slot (not shown) in the workpiece support surface 108 or under the lip (not shown) of the workpiece support surface 108. Surface 108. Knob 650 is then rotated to lock throat 122 in place.

Knob 650 has a body portion 652 and a valve stem 654. The body portion 652 is rotatably positioned in the knob well 656 in the workpiece support surface 108. Valve stem 654 extends through a bore (not shown) in knob well 656 to the underside of workpiece support surface 108. Spring assembly 658 is positioned below workpiece support surface 108, valve stem 654 (see FIG. 57) such that body portion 652 is offset against the bottom of knob well 656.

Turning to Figure 58, the body portion 652 of the knob 650 includes two finger holes 660, a locking cam 662, and a lift cam 664. Finger aperture 660 provides an area for the user to utilize to rotate knob 650. In other embodiments, other geometries are provided to allow the user to get the most out of it. In some embodiments, the body portion includes a coupling feature that allows the tool to engage the knob 650, such as a screwdriver, inner hexagonal wrench, or other tool, when rotation of the knob 650 is desired.

Cams 662 and 664 selectively engage cam ramps 666 located in knob recess 668 of throat plate 122 shown in FIG. By rotating the knob 650 in a clockwise direction, the lift cam 664 is rotated under the cam ramp 666, thereby forcing the throat plate 122 upward to allow the user to more easily grip and remove the throat plate 122. The knob 650 rotates the locking cam 662 on top of the cam ramp 666 in a counterclockwise rotation, thereby locking the throat in place.

In one embodiment, the knob 650 and the throat plate 122 are made of plastic to prevent interference with the sensing system. In areas that are subject to increased wear, metal inserts such as inserts 642 can be used to provide increased wear resistance. These metal inserts are insulated from the workpiece support surface 108 by a plastic throat plate 122.

Removal of the throat plate 122 is typically required to facilitate a change in the saw blade 118 or other forming device. Therefore, the user only rotates the knob 650 in a clockwise direction to force the throat plate 122 The throat is then lifted (as described above) and then removed to expose the mandrel nut 336 (as depicted in Figure 21). Because the steering arm assembly 194 is only supported by the latch 300 (see FIG. 29), it may be possible for the user to unintentionally remove the steering arm assembly 194 when loosening or tightening the spindle nut 336. For example, when the spindle nut is rotated in the tightening direction using a saw blade wrench, a moment is generated which acts on the steering arm rail 272 in a direction opposing the supporting force of the latch spring 308, and Can cause de-latching. The spindle lock 250 is used to prevent this de-latching, as described below.

Referring to Figure 15B, once the throat 122 is removed, the user pushes the activation arm 252 in the direction of arrow 670. Referring now to Figure 21, as the launch arm 252 is pushed in the direction of arrow 670 of Figure 15B, the flange 248 compresses the spring 246 and energizes the spindle lock 250 in the direction of arrow 672. The spindle lock 250 is thus slid along the shoulder screw 258 and the mandrel 240 by means of a guide slot 260 and a spindle slot 256 guided by a shoulder screw 258.

As the mandrel lock 250 moves to the left (as depicted in Figure 15B), the narrow portion 674 of the mandrel groove 256 moves into the notch 676 in the mandrel 240, thereby locking the mandrel, which allows the user to rotate the heart Shaft nut 336 (see Figure 21).

Additionally, the locking ramp 254 is positioned on the locking ramp 364 as depicted in FIG. Since the locking ramp 364 is part of the pyrotechnic enclosure 332 that is mounted to the height adjustment bracket 142, the steering arm assembly 194 cannot be latched from the latch 300, even when the spindle nut 336 is tightened. In an alternate embodiment, the mandrel lock is interfaced with other components attached to the height adjustment bracket 142 or a portion of the height adjustment bracket.

Removal of the throat plate 122 further allows the user to reset the steering arm assembly 194 with the steering arm assembly 194 latched from the latch 300 as a result of the saw control unit or other de-latching. As shown in Figure 61, the reset lever can be pushed by first pushing in the direction of arrow 678 416 to reset steering arm assembly 194, which moves upper latch 404 and lower latch 402 (as described above with respect to FIG. 36) to allow steering arm assembly 194 to orbit upward. The user then positions the blade wrench 680 around the spindle nut 336 or mandrel 240 to pull the steering arm assembly 194 back to the latched position, as described above with respect to Figures 26-29.

In some embodiments, the steering arm assembly 194 is raised using a push rod or some other removable tool. In a further embodiment, the handle is provided on the steering arm assembly itself. In still other embodiments, the steering arm assembly 194 is automatically raised, such as by using energy stored during movement of the steering arm assembly 194 after de-latching. In some of the embodiments, some of the energy from the movement of the steering arm assembly is stored in a spring positioned at surface 374.

The HMI unit 124 of Figure 1 is shown in more detail in Figure 62. HMI unit 124 includes a housing 700, an access point 702 (a near field communication (NFC) access point as described herein), and a plurality of status indicators 704. Other types of communication protocols (such as Bluetooth, zigbee, Wi-Fi, data protocols, mobility protocols, ultra-wideband (UWB) protocols, or any frequency band) are possible. The cover 700 protects other components of the HMI unit 124 while providing user access to components of the HMI unit 124. The NFC access point 702 is a location that can locate an electronic device such as a smart phone to transfer data from the transceiver of the HMI unit 124 to the smart phone. For this purpose, the user's smart phone has an application including a communication protocol. The user can use the NFC access point 702 to obtain the current status of the table saw 102, as well as the unique identification information of the table saw. The application can then be used to obtain maintenance recommendations, reset procedures or troubleshooting procedures, and to provide registration for table saws. The app can further lock or unlock the system. For example, the application uses a personal identification number or code to lock or unlock one or more of the bypass switch and the motor power switch.

Status indicator 704 is used to provide the user with the desired alert or status indication Device. In some embodiments, status indicator 704 indicates available power, a safety system in the bypass, a safety or system error that can be corrected by the user, and a safety or system error that can be corrected by the service center. In various embodiments, more or less status indicators 704 are provided. The configuration of HMI unit 124 implements view status indicator 704, even in bright daylight, as discussed further with respect to FIG.

As shown in FIG. 63, status indicator 704 is illuminated by four LEDs 706 on a printed circuit board (PCB) 708. In some embodiments, LEDs 706 are each provided as a colored LED having a different color than the other of the LEDs. NEC antenna 710 is also provided on PCB 708. The PCB 708 is supported by a support 712 attached to the outer cover 700. Spacer 714 is attached to support 712 by a plurality of clips 716. Spacer 714 includes a plurality of wells 718 that include openings (not shown) at a lower portion of well 718 that house respective ones of LEDs 706. Spacer 714 provides the proper spacing between the LEDs and diffuser 720, as well as the proper spacing between NEC antenna 710 and smart phone access point 702. Well 718 of spacer 714 also prevents light seepage between different colored LEDs 706. The well 718 of the spacer 714 further includes one or more openings or aisles 719. The aisles transport the dust away from the LED 706 with a channel, thereby preventing the LED 706 from being covered.

The diffuser 720 includes a plurality of lenses 722, each associated with a respective one of the wells 718. The diffuser 720 maintains the brightness of the LED as it diffuses light to appear uniform across the exposed surface. The diffuser 720 is made of a material that is scratch resistant and chip resistant.

While some of the components of the table saw 102 are thus constructed to provide ease of access or use, it is not required for the user to access or use some of the components. By way of example, the PCB 452 must be electronically accessible by the service technician during assembly of the table saw 102 and in some cases by the service technician, but It should not be accessed by the user. Thus, the USB port 458 is positioned to provide access to the technician while restricting access to the user, as initially discussed with reference to FIG.

In Figure 64, table saw 102 is depicted as having a zero bevel. Therefore, the dust mites 730 are positioned adjacent to the lower end portion of the dust mitigation groove 732 in the base housing 106. The dust mites 730 are part of a dust shield 734 that is attached to the ramp 134 (not visible in Figure 64). In this position, the outer cover 454 and the USB port 458 of Figure 42 are not visible to the user.

Figure 65 depicts a rear view of the table saw 103 when the table saw 102 is positioned at an angle of forty-five degrees (the dust shield 734 is not depicted in this view). At this location, the outer housing 454 and the USB port 458 are viewable via the dust mitigation slot 732. Therefore, the USB port 458 can be accessed by a service technician. However, since the user is not expected to see frequently through the dust mitigation slot 732 at the angle depicted in FIG. 65, the user will typically not see the USB port 458. Therefore, the USB port 458 is shielded from the user in most situations.

In some embodiments, access to the USB port 458 is further protected, such as by providing a protective plastic or rubber plug 736 (FIG. 66) or a cover 738 that is tightened with a break-resistant screw 740 (FIG. 67). In some embodiments, the outer shroud 454 must be removed to provide access to the PCB 452.

Although the invention has been illustrated and described in detail in the drawings and the foregoing description It is to be understood that the preferred embodiments have been presented, and that all changes, modifications, and further applications are within the spirit of the invention.

Claims (20)

A power tool assembly comprising: a workpiece support surface; a steering arm assembly including a steering arm frame and a mandrel constituting a forming device at least partially above the workpiece support surface, the steering arm The formation is moved in a falling plane to cause the forming device to completely fall under the workpiece support surface; a belt operatively coupled to the mandrel and configured to rotate the mandrel via a pulley, the slave pulley Having a rotating shaft from a pulley; a motor operatively coupled to a power shaft of the belt via a motor end pulley, the motor end pulley having a motor end pulley rotating shaft; and a track bracket constructed The track supports the steering arm assembly, the track bracket defining a steering arm track axis between the motor end pulley rotation axis and the slave pulley rotation axis. The power tool assembly of claim 1, wherein the steering arm track axis is lower than the motor end pulley rotation axis. A power tool assembly as claimed in claim 2, wherein the track bracket is fixedly attached to a height adjustment bracket. The power tool assembly of claim 3, wherein: the height adjustment bracket includes a locator pin and a counter-rotating pin; the track bracket includes an axis defining a hole and is configured to receive the locator pin One of the alignment apertures and extending longitudinally along a slot axis and configured to receive an anti-rotation slot of the counter-rotating pin; and the slot axis is aligned to intersect the aperture axis. The power tool assembly of claim 4, wherein: the track bracket includes an inner surface portion that is configured to contact the height adjustment bracket; and the inner surface defines a non-parallel plane parallel to the plane of the drop plane Zero angle. A power tool assembly according to claim 5, wherein: the inner face defines an angle of about 0.65° with respect to a plane parallel to the plane of the drop. The power tool assembly of claim 5, wherein: the track bracket includes a track axle hole through which a track axle is inserted; the steering arm frame is supported by the track bracket via the track axle track And the track shaft hole includes a lower portion and an upper portion, the lower portion and the upper portion being configured to form two shoulders extending in the track shaft hole along an axis defined by the track shaft hole. The power tool assembly of claim 7, wherein: the lower portion is a lower circular portion having a first starting point; the upper portion is an upper circular portion having a second starting point; and the The second starting point is offset from the first starting point. The power tool assembly of claim 7, wherein: the lower portion is a lower circular portion having a first diameter; the upper portion is an upper circular portion having a second diameter; The second diameter is different in size from the first diameter. The power tool assembly of claim 7, further comprising: at least two fixed screws, each of the at least two fixed screws being configured to abut against the two shoulders. The power tool assembly of claim 10, wherein: the track bracket further includes a pair of aligned holes leading to the track shaft bore; the track shaft includes a hole therethrough and aligned with the pair An orbital shaft hole is aligned; and the power tool assembly further includes a track pin extending through the pair of aligned holes and the track shaft hole. A method of attaching a steering arm assembly to a power tool assembly, the steering arm assembly including a steering arm frame and a mandrel configured to support at least a portion of a forming device above a workpiece support surface, the steering arm The formation is configured to move in a falling plane to cause the forming device to completely fall under the workpiece support surface, the method comprising: defining a slave pulley rotation axis for constructing one of the belt rotations from the pulley; Constructing a power shaft operatively coupled to a motor and constituting a motor end pulley rotation shaft operatively coupled to one of the belt motor end pulleys; and defining a rotation axis of the motor end pulley and the slave pulley A steering arm track axis between the shafts, wherein a track bracket is constructed to support the steering arm assembly. The method of claim 12, wherein defining the steering arm track axis comprises defining a steering arm track axis that is lower than a rotational axis of the motor end pulley. The method of claim 13, wherein defining the steering arm track axis comprises fixedly attaching the track bracket to a height adjustment bracket. The method of claim 14, wherein the fixed attachment of the rail bracket to a height adjustment bracket comprises: inserting one of the height adjustment brackets into the alignment hole of one of the rail brackets The alignment hole defines a hole axis; and Inserting an anti-rotation pin of the height adjustment bracket into one of the anti-rotation slots of the track bracket, the anti-rotation slot including a slot axis extending longitudinally along the slot, the slot axis being aligned with the aperture The axes intersect. The method of claim 15, wherein the fixed attachment of the rail bracket to the height adjustment bracket comprises: positioning an inner surface portion of the rail bracket opposite the height adjustment bracket, the inner surface defining parallel A non-zero angle in one of the planes of the falling plane. The method of claim 15, wherein defining the steering arm track axis comprises: inserting a track axis into a track shaft hole of the track bracket; and defining a track axis defined by the track axis hole A lower portion of one of the holes and an upper portion define one of the two shoulder portions extending in axial contact with the inserted track shaft. The method of claim 15, wherein defining the steering arm track axis comprises: applying force to the track shaft by at least two fixing screws against the two shoulders. The method of claim 18, further comprising: aligning a track axle hole with a hole aligned to one of the track shaft holes; and aligning the aligned hole and the aligned track The shaft hole is positioned with a track pin. The method of claim 19, further comprising: compressing the pair of bearings by using respective inner bearing walls of the bracket spaced apart from the steering arm frame.