CA1178460A - Rotary holding tool - Google Patents
Rotary holding toolInfo
- Publication number
- CA1178460A CA1178460A CA000416994A CA416994A CA1178460A CA 1178460 A CA1178460 A CA 1178460A CA 000416994 A CA000416994 A CA 000416994A CA 416994 A CA416994 A CA 416994A CA 1178460 A CA1178460 A CA 1178460A
- Authority
- CA
- Canada
- Prior art keywords
- rotary holding
- support member
- axis
- holding member
- rotation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/021—Faceplates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q16/00—Equipment for precise positioning of tool or work into particular locations not otherwise provided for
- B23Q16/02—Indexing equipment
- B23Q16/04—Indexing equipment having intermediate members, e.g. pawls, for locking the relatively movable parts in the indexed position
- B23Q16/06—Rotary indexing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/066—Work supports, e.g. adjustable steadies adapted for supporting work in the form of tools, e.g. drills
Abstract
ABSTRACT
The invention is a rotary holding tool for rotatably holding a workpiece during machining of the workpiece by a lathe, grinding tool or similar equipment. The rotary holding tool has both a means for accurately and rapidly adjusting the angular orientation of the workpiece by five degree intervals and also a vernier means for fine adjustment of that angular orientation.
The invention is a rotary holding tool for rotatably holding a workpiece during machining of the workpiece by a lathe, grinding tool or similar equipment. The rotary holding tool has both a means for accurately and rapidly adjusting the angular orientation of the workpiece by five degree intervals and also a vernier means for fine adjustment of that angular orientation.
Description
o This invention relates to a tool for rotat~bly holding a workpiece on the bed of a surface grinding machine, milling machine or similar equipment.
Grinding machines, milling machines, and other similar equipment require that the workpiece be adequately supported on the bed of the machine by a "set-Up" which usually requires a considerable amount of skilled labour to install. Such a set-up must be built such that it remains accurately positioned while the same operation is being performed on a series of workpieces. One common set-up involves a means for rotatably supporting a workpiece on the bed of the machine such that the workpiece may be rotated to present different faces to the cutting tool on the machine. Set-ups that allow rotation of a workpiece while maintaining the workpiece in accurate alignment are very expensive, and as mentioned, the installation of such a set-up involves expensive labour costs. It would thus be very advantageous if a rotary holding tool were devised which minimized set-up labour costs and was very simple to operate. The subject invention is such a tool; it incorporates features of a number of presently expensive single function tools with new features of its own, and can be produced at a very reasonable price. In particular, the subject invention incorporates the function of such tools as an indexing plate, a turntable base, a radius dresser, a rotary table (horizontal and vertical or tilting), and an index center, among others.
The subject invention is a rotary holding tool, comprising a base member, a support member extending from the base member, a rotary holding member rotatably mounted to the support member such that its axis of rotation extends parallel to the base member, and a releasable angular locking means 4~0 adapted to releasably lock the rotary holdlng member and the support member into a series of relative angular alignment positions. A portion of the holding member is disc-shaped with its symmetrical axis on the axis of rotation and has graduated markings extending around its periphery to indicate its angular displacement relative to the support member. The releasable angular locking means comprises a sexies of apertures on the rotary holding member, the apertures being positioned at equal radial distances from the axis of symmetry of the holding member and being spaced at equal angular intervals therearound. The locking means also comprises a series of fasteners on the support member, the fasteners being spaced at equal angular intervals around the axis of symmetry of the holding member and each fastener having a complementary fit with any one of the apertures. The angular positioning of the apertures and the fasteners is such and the number of fasteners is such that when one of the fasteners fits into one of the apertures none of the other fasteners can be fitted into any other of the apertures. The angular separation between adjacent fasteners isgreater than the angular separation between adjacent apertures by an angular increment equal to that between adjacent relative angular alignment positions.
Each of the fasteners may be a pin slidable through the support member and having its symmetrical axis extending parallel to the axis of rotation of the rotary holding member, and each of the apertures may be a bore extending parallel to the axis of rotation of the rotary holding member, wherein each of the relative angular alignment positions is defined by one of the pins sliding axially to fit into one of the bores.
4~0 The equal angular spacing between apertures may be fifteen degrees and the equal angular ~pacing between fasteners may be twenty degrees such that the angular spacing between adjacent relative angular alignment positions is five degrees, there being 72 alignment positions in such arrangement.
The rotation of the rotary holding member relative to the support member may be limited to a range of angles, the limited rotation resulting from engagement of a pin on the support member with an annular groove extending angularly around the rotary holding member, the length of the groove defining the range of angles.
The invention will next be more fully described by means of a preferred embodiment utilizing the accompanying drawings wherein:
Figure 1 is a perspective view of the rotary holding tool of the subject invention.
Figure 2 is a partially-sectioned side view of the rotary holding tool of the subject invention.
Figure 3 is an end view of the rotary holding tool of the subject invention.
; Figure 4 is a perspective view of the radius dresser attachment of the subject invention and its position relative to a grindstone prior to dressing.
Figure 5 is an end view of a dressed grindstone and a workpiece contoured by the grindstone.
Figure 6 is a perspective view of the rotary holding tool of the subject invention, wherein the tool is supported such that its axis of rotation extends generally vertically.
Figure 7 is a bottom view of the rotary holding tool of the subject invention.
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Eigure 8 is a side view of the rotary holding tool of the subject invention as in Figure 2 but illustrating replacement of the rotary holding member by a live centre.
Figure 9 illustrates a small sampling of the wide variety of dies that may be formed utilizing the rotary holding tool of the subject invention.
Figure 10 illustrates the rotary holding tool of the subject invention positioned on the bed of a grinding machine.
Referring to Figure 1, the rotary holding tool is generally designated as 11 and comprises an interchangeable base member 12, a support member 13 secured at right angles to base member 12, a rotary holding member rotatably mounted to the support member 13 and generally designated as 14, and releasable angular locking means generally designated as 15. It may additionally comprise a second support member 16 tc better support a workpiece held in the rotary holding member 14 and also a radius dresser attachment 17 adapted to be held by the rotary holding member 14.
Support member 13 is fastened to one end of base member 12 by two pairs of screws 20, the heads of which are shown in Figure 7. Support member 13 as well as base member 12 are fashioned from solid steel stock, and each of the screws 20 are fastened into a complementary threaded bore extending longitudinally in the support member. Proximate to the bores for screws 20 are a double row of four holes 21 as shown in Figure 7. Each row of holes 21 comprises a first pair of holes 22 into each of which are pressed a dowel pin 23 (see Figure 1) and an alternately-positioned second pair of holes 24 each of which are threaded to receive a screw 25 (see Figure 1). A
pair of guide.bars 26 each have four holes bored therein, one ~ .
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pair of which are adapted to house the pair of dowel pins 23 and the alternately-positioned pair of which are adapted for placement of the pair of screws 25 therein. The four holes in each guide bar 26 are in longitudinal-alignment and have longitudinal spacing corresponding to that of the row of holes 21. The double row of holes 21 and the pair of guide bars 26 are precision machined and positioned on base member 12 prior to the attachment of base member 12 to support member 13. The mutual spacing of guide bars 26 and the width W of support member 13 (see Figure 3) are such that support member 13 fits between guide bars 26 within a tolerance of 0.0002 inches. The four holes in base member 12 through which screws 20 are adapted to extend each have a diameter sufficiently larger than the shaft diameter of the allen head cap screws 20 that their exact positioning is not as critical as that of the two rows of holes 21. As will be obvious, the holes in base member 12 through which screws 20 extend are counter-sunk so that the heads of the screws do not protrude above the surface of the base member.
As shown in Figures 2 and 3, support member 13 is fashioned from solid steel stock having a circular bore generally`
designated as 28 extending centrally therethrough. The steel stock , is carborized and hardened to l/16-inch depth, then deep freeze normalized (4 phase) for stability. Into each end of bore 28 is pressed a set of double row bearings 29. Between each set of double row bearings 29 isa Meehanite annular spacer 30.
Meehanite is a very fine-grained cast iron, and the Meehanite spacer absorbs any vibrations created by the bearings 29. A hollow spindle shaft 31, having one end threaded and an integral collar 32 on its other end, extends through the inner race of each of the set of ' ~. .
bearings 29 so as to be rotatable relative to support member 13;
the outer diameter of shaft 31 is exactly 0.750 inches. Rotary holding member 14 comprises a disc 33 and a connected block 34, as shown in Figure 1, as well as shaft 31. Disc 33 is secured to hollow spindle shaft 31 so as to extend in a plane parallel to support member 13 and perpendicular to base member 12. That end of hollow spindle shaft 31 which extends from the side of support member 13 opposite to disc 33 is threaded, as shown in Figure 2, the thread receiving an internally-threaded collar 35 which lQ when in position prevents longitudinal movement of shaft 31 relative to support member 13. A set screw is threaded radially into collar 35 to prevent relative movement between collar 35 and shaf~ 31. A handle 36, as shown in Figures 1, 2, and 3, comprises a lever arm 37 having a larger end and a smaller end. From the smaller end of arm 37 a post 38 extends normal to the plane of arm 37. At the larger end of arm 37 and on the opposite side from post 38 a collar 39 extends, the inner diameter of collar 39 being slightly larger than the diameter at the outer end of spindle shaft 31. A set screw extends radially in collar 39 and secures handle 36 to the outer end of spindle shaft 31.
Rotary holding member 14 comprises in part the disc 33, which is fashioned from a solid piece of steel stock and which has its symmetrical axis of rotation aligned with the axis of rotation of spindle shaft 31. As shown in Figure 2, disc 33 has a radial dimension which is less than the distance between the axis of rotation of spindle shaft 31 and the facing surface of base member 12. Disc 33 has a diametrically-extending groove 45, as more clearly shown in Figures 1 and 6. In cross section, groove 45 is shaped such that each edge of the groove ~' ;
has a shoulder extending therealong. Rotary holding member 14 also comprises a clamping mechanism which is a generally rectan-gular block 34 having a V-shaped groove in one end and a plate ~8 fastenable across that end of block 34. Four set screws 49 secure plate 48 to block 34. As shown in Figures 1 and 6, the workpiece 50 is held against the inclined surfaces of the V-shaped groove in block 34 by an insert 51 which acts as a clamp when a pair of screws 52 are rotated to react against plate 48. In case the workpiece to be installed in the rotary holding member has a size greater than that between block 34 and plate 48 a yoke clamp 55 is provided. Yoke clamp 55, as shown in Figure 1, has a pair of facing flanges 56 integrally formed on its legs, each of the flanges 56 entering a respective groove 57 laterally positioned on rectangular block 34. A screw 58 is rotatable in a threaded hole 59 in yoke 55, screw 58 serving the same purpose as the screws in plate 48, namely, to clamp the workpiece against the surfaces of the V-shaped groove in rectangular block 34. It will, of course, be necessary to remove plate 48 from rectangular block 34 when yoke 55 is being utilized.
Rectangular block 34 is secured in disc 33 by means of a clamp 59A (shown in outline in Figure 2) which slides in the broader portion of groove 45 and grabs against the shoulders of that groove when a pair of screws 59B (shown in outline in - , Figure 2) positioned in holes 59C (see Figure 2) ln block 47 are rotated so as to more deeply penetrate a pair of threaded holes in clamp 59A. The head of each of the screws sits on a shoulder within the respective hold 59C, the body of each screw extending into a respective threaded hole in the clamp 59A.
Block 34 is movable along groove 45 when the screws 59B are loosened.
Second support member 16 is slidable in a groove 60 that extends longitudinally in base member 12. A screw 61 extends through an elongated groove 62 in a base portion of second support member 16 and threads into a selected one of a longitudinal series of threaded holes 63 centred in the groove 62.
Second support member 16 comprises a block 65 which is adjustably slidably connected to a base 66 by a slot and groove means. The block 65 has a longitudinal series of threaded holes 67 adapted to selectively house a screw 68. The combination of groove 62, screw 61, and the series of holes 63 allow second support member 16 to assume an infinite number of longitudinal positions along base member 12. Since longitudinal groove 60 is laterally centred in base member 12 and second support member 16 is laterally symmetrical, second support member 16 is also laterally centred in base member 12. In a similar manner, the combination of the series of threaded holes 67 extending longitudinally in block 65, screw 68 which is adapted to be selectively housed therein, and the slot and groove means between block 65 and base 66 allow the block 65 to assume an infinite number of vertical positions relative to base 66. With screw 68 loosened, block 65 can move relative to base 66 along a portion of the length of the slot and groove means; if greater adjustment is needed, screw 68 can be removed from the particular threaded hole 67 and placed into an adjacent hole 67. Regarding the slot and groove means between block 65 and base 66, base 66 , 4~() has a vertical ~roove ~not shown) form~d on lts on~ end face and having a shape similar in cross section to that of groove 60;
block 65 has a longitudinal track with a complementary cross section to that of the groove of base 66 on its one end face.
Extending through a longitudlnal bore in the upper portion of block 65 is a pin 70 having a conical end portion which is a 60 degree standard center. A screw 71 extends into a threaded bore in the other end of pin 70, the head of screw 71 being retained in a groove 72 of a bracket 73 fastened by screw 74 to block 65. As screw 71 is rotated, pin 70 is retracted or extended from block 65.
As shown in Figures 1 and 2, base member 12 has a series of longitudinally-extending grooves on that surface adapted to rest upon the working surface of the grinding or milling machine; those grooves comprise a pair of grooves 75 each positioned adjacent to a respective lateral edge of base member 12 and three centrally-located grooves 76. The five longitudinally-extending grooves are also shown in Figures 3 and 7. With reference to Figure 7, the circular shapes 77 represent cylindrical cavities drilled in base member 12 to reduce the overall weight of the holding tool of the subject invention. As also shown in Figure 7, threaded bores 63 into which screw 61 is selectively securable extend through the thickness of base member 12 from the hollow of groove 60 to the hollow of the most centrally-positioned groove 76. The grooves 75 and 76 and the cylindrical cavities 77 improve the friction between that surface of base member 12 and the grinding or milling machine on which base member 12 rests. Base member 12 can be inter-; changed with other base members of greater or lesser length, depending on the requirements of the particular job.
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11'7~4~0 Rotary holding member 14 has groove 45 diametricallyextending on on~ planar surface and a circular groove 80 centred on the other planar surface. Circular groove 80 has an inner periphery 81 and an outer periphery 82, inner pe~iphery 81 having a lip extending therealong as ~hown in Figure 2. A pair of stops 83 are adapted to slide in groove 80, each stop 83 having a clamp connected thereto by a screw such that the lip on the inner periphery of groove 80 may be clamped between a stop 83 and its associated clamp to maintain the stop 83 at a fixed angular position on the disc 33. A pin 85 is slidably mounted on a bracket 86 laterally extending from and integral with support member 13, as shown in Figure 3. Pin 85 is slidable longitudinally on the rotary holding tool such that its one end can be extended into groove 80; when in such extended position, pin 85 allows only limited rotation of . rotary holding member 14.
The circumference of the disc 33 is graduated into 360 divisions, each division representing a degree of relative angle of rotation between support member 13 and rotary : 20 holding member 14. Secured to the outer end of support member 13 by four screws 88 is an indicator bracket 89 having, as shown in Figure 1, an arcuate lip 90 extending as an arcuate continuation of the circumference of disc 33 of rotary holding member 14. Lip 90 is a graduated vernier allowing for accuracy in relative angular displacement between support member 13 and .: rotary holding member 14 of one-twelfth of one degree, i.e. 5 ~ minutes. Each of the vernier markings on lip 90 is offset from : the adjacent marking such that the spacing between the outermost of the 12 equidistantly-spaced markings on the vernier correspond .
. 30 to 35 degrees of rotation of the disc 33 If the central mark on lip 90 and the 20 màrk, for instance, of the disc were first "
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aligned and then the disc rot~ted slightly so that the first adjacent mark on the lip 90 was opposite the 23 mark on the disc, the angle of the disc would be 20 degrees plus 3/35 degrees. Set screw 91 acts as a spindle lock by acting against spindle shaft 31 to prevent relative angular displacement between rotary holding member 14 and support member 13.
Near the outer perimeter of the disc 33 are a series of twenty-four longitudinally-extending bores 92 each angularly displaced by 15, as shown in Figure 3. Longitudinally slidable in support member 13 are a series of three pins 93, the symmetrical axis of the pins lying in the same circular arc as that extending through the symmetrical axis of the bores 92. Pins 93 are angularly displaced from each other relative to the centre of spindle shaft 31 by 20~. One end of each of the pins 93 is machined into a generally triangular cross-sectional shape so as to fit with close tolerance into any of the bores 92. The shoulder formed by the transition of each pin from circular to triangular cross section acts as a stop limiting deeper penetration of the pin into a bore 92 of disc 33. The effect of the difference in relative angular displacement between each adjacent pair of bores 92 and each adjacent pair of pins 93 is to create a rapid, facile means for angularly displacing rotary holding member 14 at 5 increments relative to support member 13. The 5 increments result when pins 93 are sequentially inserted into rotary holding member 14. With reference to Figure 3, the 5 increments are obtained by repeatedly inserting in left to right order the three pins 93, i.e. left, centre, right, left, centre, right, left, etc. If the 5 increments are desired in movement of the wheel in the opposite direction, right to left order of insertion of the pins 93 is used, i.e. right, centre, left, right, centre, . . . ~ .
:, left, right, etc. The pins 93 are the series of bores 92 have together been previously referred to as releasable angular locking means 15.
; Figure 6 illustrates the adaptability of the rotary holding tool of the subject invention. Support member 13 and rotary holding member 14 have been rotated such that a workpiece 50 positioned therein is rotated in the horizontal plane. A
pair of support brackets 95 have each been affixed to a respective side of support member 13 by a pair of screws 96 placed into the threaded holes 97 of Figure 1. In the configuration of Figure 6 pin 85 has been previously removed from bracket 86 and handle 36 removed from the end of spindle shaft 31. Rotary holding member 14 is rotated relative to support member 13 by hand in this configuration, and releasable ~ angular locking means 15 as well as the vernier fine adjustment ; that utilizes arcuate lip 90 are both operable.
; Figure 8 is a side view of the rotary holding tool of l.i the subject invention but illustrating a different rotary holding member than that shown in Figure 2. The alternate rotary :
holding member of Figure 8 is a three-piece "li~e centre"
- construction compriging an internally-threaded shaft 100 and a hollow shaft 101, both shafts 100 and 101 having an outer diameter sized such that they are insertable within the cylindrical cavity of spindle shaft 31 and having an integral lip on one of their ends such that a bolt 102 extending :
-~- through shaft 101 can be rotated into the threaded bore of shaft 100; when bolt 102 is tightened, shaft 100 rotates with handle 36. One end of shaft 100 is conical-shaped, and a workpiece can be retained between that conical end portion and the conical end portion of pin 70.
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a~v The operation of the subject invention will next be described. It should be obvious to a person skilled in the art that the rotary holding tool of the subject invention has the capability of producing all of the dies shown in Figure 9.
The base portion of each die is a portion of the steel stock (of circular, square, hexagonal or other cross section) adapted to be retained in block 34 of rotary holding member 14. The other portion of each die in Figure 9 is formed by selectively angularly-displacing the die while acting on the die with a grinding or milling machine. A selected length is cut from the steel stock and the selected material is placed against the inclined surfaces of the V-shaped groove in block 34 of rotary holding member 14. Screws 52 are tightened against an insert (51 in Figure 1) which holds the selective workpiece 50 firmly in block 34. As earlier described, if the workpiece is of very large cross section plate 48 is removed from block 34 and yoke 55 is applied to block 34 such that itsflanges 56 extend ,- into grooves 57. With yoke 55 in position the workpiece will be held between the inclined surfaces of the V-shaped groove in block 34 and an insert tnot shown) against which screw ' 58 acts.
Once the location of the axis of symmetry of the portion of the workpiece to be machined has been determined, ` the screws in holes 59C are loosened and block 34 is slidably displaced along groove 45 of disc 33. With reference to Figure 9td) the axis of symmetry of the cylindrical stock ~' placed into block 34 is offset from the axis of symmetry o,f n~ spindle shaft 31 by an amount "x", the screws in holes 58 ' , .
are then tightened. As will be obvious to a person skilled in the art, the die with the eccentric offset of Figure 9(d) will be formed when a grinding wheel is brought adjacent to the retained stock and rotary holding member 14 i9 rotated.
Similarly, the die of Figure 9(b) i9 machined by displacing the axis of symmetry of the stock by a distance "y" from the axis of rotation of spindle shaft 31. In the case of the die shown in Figure 9(b) the axis of symmetry of the stock is, however, alternately displaced the distance "y" in both , 10 directions along groove 45 from the axis of symmetry of spindle shaft 31. The purpose of pin 85 and the pair of stops 83 should now be obvious. Stops 83 can be adjusted such that rotary holding member 14 is rotatable only through 180 so as to place semi-cylindrical surfaces on the die of Figure 9(b).
, After the grinding of the two semi-cylindrical surfaces have been completed the arcuate or straight surfaces connecting ; those semi-cylindrical surfaces can then easily be ground or milled to shape.
It should be obvious that the dies of Figure 9(a), (c), (e), (f), and (g) can be constructed with the axis of `i~ symmetry of the stock positioned in-line with the axis of ; symmetry of spindle shaft 31. Utilizing releasable angular - locking meansl5,5 increments in rotation of rotary holding member 14 are possible and also multiples of 5 increments.
For instance, the die of Figure 9(a) is formed by utilizing the same pin 93 positioned sequentially in four equi-angularly ; spaced bores 92. The die of Figure 3(c) would utilize the same pin 93 positioned sequentially in six equi-angularly spaced bores 92, while the dies of Figures 9(e), (f), and (g) would . ~
utilize 8, 3, and 12 equi-angularly spaced bores 92, respectively.
When a die or other workpiece is being machined ~hich does not re~uire the axis of rotation of the workpiece to be offset from the axis of rotation of spindle shaft 31, block 34 or both block 34 and disc 33 may be removed from the rotary holding tool; disc 33 is removed by loosening the four screws holding it to the collar 32 of spindle shaft 31. With shafts 100 and 101 of the "live centre" positioned in spindle shaft 31 the workpiece can be retained between the conical end portion of shaft 100 and the conical end portion of pin 70,as shown in Figure 8. Thisholding arrangement can be very advantageous when the whole length of a workpiece is to be machined and the presence of block 34 would present a hindrance to such machining. Workpieces of diverse lengths can be accommodated by varying the longitudinal position of second support member 16 on base 12 and, if necessary, inter-changing base 12 for a longer or shorter base.
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As shown in Figure 10, the rotary holding tool of the subject invention is secured to the bed of a grinding machine such that the workpiece held by the rotary holding tool extends parallel to the axis of rotation of the grinding wheel. The lowermost point on the grinding wheel is vertically positioned slightly below the uppermost surface of the workpiece such that grinding takes place when the axis of rotation of the grinding wheel is horizontally offset from the axis of symmetry of the workpiece by 0.030 inches. With the grinding wheel maintained in that position, such that it is slightly horizontally offset from being positioned directly above the workpiece, the workpiece is slowly rotated and simultaneously the bed of . . .i ~ - 15 -.
~' the grinding machine moves the rotary holding tool and the affixed workpiece normal to the plane of the grinding wheel.
Persons skilled in the art would be very familiar with ~ proper grinding techniques.
; Radius dresser attachment 17 was mentioned previously.
,i When its one end is fitted into the V-shaped groove of block 34, ~` it is used to dress grinding wheels, as shown in Figures 4 and 5.
Unlike the relative positioning of the grinding wheel and the rotary holding tool in Figure 10, the rotary holding tool is rotated such that its longitudinal axis is in the plane of the ,~!" grinding wheel. Radius dresser attachment 17 has a grinding ~' wheel cutter 105 positioned at its outer end and adapted to be brought against the periphery of the grinding wheel as shown in Figure 4. Stops 83 can be utilized to limit rotation of rotary holding member 14 such that one or both edges of the ' grinding while are fully or partially rounded. Figure 5 '~ illustrates a grinding wheel on which one of the edges has been fully rounded. The grinding wheel can subsequently be ~r placed adjacent to the workpiece 106 of Figure 5 so that the rounded profile of the grinding wheel can be transferred to the workpiece.
Although only a few uses of the rotary holding tool of the subject inventionhave been described, a wide range of other uses for the tool should be obvious to a skilled machinist.
Grinding machines, milling machines, and other similar equipment require that the workpiece be adequately supported on the bed of the machine by a "set-Up" which usually requires a considerable amount of skilled labour to install. Such a set-up must be built such that it remains accurately positioned while the same operation is being performed on a series of workpieces. One common set-up involves a means for rotatably supporting a workpiece on the bed of the machine such that the workpiece may be rotated to present different faces to the cutting tool on the machine. Set-ups that allow rotation of a workpiece while maintaining the workpiece in accurate alignment are very expensive, and as mentioned, the installation of such a set-up involves expensive labour costs. It would thus be very advantageous if a rotary holding tool were devised which minimized set-up labour costs and was very simple to operate. The subject invention is such a tool; it incorporates features of a number of presently expensive single function tools with new features of its own, and can be produced at a very reasonable price. In particular, the subject invention incorporates the function of such tools as an indexing plate, a turntable base, a radius dresser, a rotary table (horizontal and vertical or tilting), and an index center, among others.
The subject invention is a rotary holding tool, comprising a base member, a support member extending from the base member, a rotary holding member rotatably mounted to the support member such that its axis of rotation extends parallel to the base member, and a releasable angular locking means 4~0 adapted to releasably lock the rotary holdlng member and the support member into a series of relative angular alignment positions. A portion of the holding member is disc-shaped with its symmetrical axis on the axis of rotation and has graduated markings extending around its periphery to indicate its angular displacement relative to the support member. The releasable angular locking means comprises a sexies of apertures on the rotary holding member, the apertures being positioned at equal radial distances from the axis of symmetry of the holding member and being spaced at equal angular intervals therearound. The locking means also comprises a series of fasteners on the support member, the fasteners being spaced at equal angular intervals around the axis of symmetry of the holding member and each fastener having a complementary fit with any one of the apertures. The angular positioning of the apertures and the fasteners is such and the number of fasteners is such that when one of the fasteners fits into one of the apertures none of the other fasteners can be fitted into any other of the apertures. The angular separation between adjacent fasteners isgreater than the angular separation between adjacent apertures by an angular increment equal to that between adjacent relative angular alignment positions.
Each of the fasteners may be a pin slidable through the support member and having its symmetrical axis extending parallel to the axis of rotation of the rotary holding member, and each of the apertures may be a bore extending parallel to the axis of rotation of the rotary holding member, wherein each of the relative angular alignment positions is defined by one of the pins sliding axially to fit into one of the bores.
4~0 The equal angular spacing between apertures may be fifteen degrees and the equal angular ~pacing between fasteners may be twenty degrees such that the angular spacing between adjacent relative angular alignment positions is five degrees, there being 72 alignment positions in such arrangement.
The rotation of the rotary holding member relative to the support member may be limited to a range of angles, the limited rotation resulting from engagement of a pin on the support member with an annular groove extending angularly around the rotary holding member, the length of the groove defining the range of angles.
The invention will next be more fully described by means of a preferred embodiment utilizing the accompanying drawings wherein:
Figure 1 is a perspective view of the rotary holding tool of the subject invention.
Figure 2 is a partially-sectioned side view of the rotary holding tool of the subject invention.
Figure 3 is an end view of the rotary holding tool of the subject invention.
; Figure 4 is a perspective view of the radius dresser attachment of the subject invention and its position relative to a grindstone prior to dressing.
Figure 5 is an end view of a dressed grindstone and a workpiece contoured by the grindstone.
Figure 6 is a perspective view of the rotary holding tool of the subject invention, wherein the tool is supported such that its axis of rotation extends generally vertically.
Figure 7 is a bottom view of the rotary holding tool of the subject invention.
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Eigure 8 is a side view of the rotary holding tool of the subject invention as in Figure 2 but illustrating replacement of the rotary holding member by a live centre.
Figure 9 illustrates a small sampling of the wide variety of dies that may be formed utilizing the rotary holding tool of the subject invention.
Figure 10 illustrates the rotary holding tool of the subject invention positioned on the bed of a grinding machine.
Referring to Figure 1, the rotary holding tool is generally designated as 11 and comprises an interchangeable base member 12, a support member 13 secured at right angles to base member 12, a rotary holding member rotatably mounted to the support member 13 and generally designated as 14, and releasable angular locking means generally designated as 15. It may additionally comprise a second support member 16 tc better support a workpiece held in the rotary holding member 14 and also a radius dresser attachment 17 adapted to be held by the rotary holding member 14.
Support member 13 is fastened to one end of base member 12 by two pairs of screws 20, the heads of which are shown in Figure 7. Support member 13 as well as base member 12 are fashioned from solid steel stock, and each of the screws 20 are fastened into a complementary threaded bore extending longitudinally in the support member. Proximate to the bores for screws 20 are a double row of four holes 21 as shown in Figure 7. Each row of holes 21 comprises a first pair of holes 22 into each of which are pressed a dowel pin 23 (see Figure 1) and an alternately-positioned second pair of holes 24 each of which are threaded to receive a screw 25 (see Figure 1). A
pair of guide.bars 26 each have four holes bored therein, one ~ .
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pair of which are adapted to house the pair of dowel pins 23 and the alternately-positioned pair of which are adapted for placement of the pair of screws 25 therein. The four holes in each guide bar 26 are in longitudinal-alignment and have longitudinal spacing corresponding to that of the row of holes 21. The double row of holes 21 and the pair of guide bars 26 are precision machined and positioned on base member 12 prior to the attachment of base member 12 to support member 13. The mutual spacing of guide bars 26 and the width W of support member 13 (see Figure 3) are such that support member 13 fits between guide bars 26 within a tolerance of 0.0002 inches. The four holes in base member 12 through which screws 20 are adapted to extend each have a diameter sufficiently larger than the shaft diameter of the allen head cap screws 20 that their exact positioning is not as critical as that of the two rows of holes 21. As will be obvious, the holes in base member 12 through which screws 20 extend are counter-sunk so that the heads of the screws do not protrude above the surface of the base member.
As shown in Figures 2 and 3, support member 13 is fashioned from solid steel stock having a circular bore generally`
designated as 28 extending centrally therethrough. The steel stock , is carborized and hardened to l/16-inch depth, then deep freeze normalized (4 phase) for stability. Into each end of bore 28 is pressed a set of double row bearings 29. Between each set of double row bearings 29 isa Meehanite annular spacer 30.
Meehanite is a very fine-grained cast iron, and the Meehanite spacer absorbs any vibrations created by the bearings 29. A hollow spindle shaft 31, having one end threaded and an integral collar 32 on its other end, extends through the inner race of each of the set of ' ~. .
bearings 29 so as to be rotatable relative to support member 13;
the outer diameter of shaft 31 is exactly 0.750 inches. Rotary holding member 14 comprises a disc 33 and a connected block 34, as shown in Figure 1, as well as shaft 31. Disc 33 is secured to hollow spindle shaft 31 so as to extend in a plane parallel to support member 13 and perpendicular to base member 12. That end of hollow spindle shaft 31 which extends from the side of support member 13 opposite to disc 33 is threaded, as shown in Figure 2, the thread receiving an internally-threaded collar 35 which lQ when in position prevents longitudinal movement of shaft 31 relative to support member 13. A set screw is threaded radially into collar 35 to prevent relative movement between collar 35 and shaf~ 31. A handle 36, as shown in Figures 1, 2, and 3, comprises a lever arm 37 having a larger end and a smaller end. From the smaller end of arm 37 a post 38 extends normal to the plane of arm 37. At the larger end of arm 37 and on the opposite side from post 38 a collar 39 extends, the inner diameter of collar 39 being slightly larger than the diameter at the outer end of spindle shaft 31. A set screw extends radially in collar 39 and secures handle 36 to the outer end of spindle shaft 31.
Rotary holding member 14 comprises in part the disc 33, which is fashioned from a solid piece of steel stock and which has its symmetrical axis of rotation aligned with the axis of rotation of spindle shaft 31. As shown in Figure 2, disc 33 has a radial dimension which is less than the distance between the axis of rotation of spindle shaft 31 and the facing surface of base member 12. Disc 33 has a diametrically-extending groove 45, as more clearly shown in Figures 1 and 6. In cross section, groove 45 is shaped such that each edge of the groove ~' ;
has a shoulder extending therealong. Rotary holding member 14 also comprises a clamping mechanism which is a generally rectan-gular block 34 having a V-shaped groove in one end and a plate ~8 fastenable across that end of block 34. Four set screws 49 secure plate 48 to block 34. As shown in Figures 1 and 6, the workpiece 50 is held against the inclined surfaces of the V-shaped groove in block 34 by an insert 51 which acts as a clamp when a pair of screws 52 are rotated to react against plate 48. In case the workpiece to be installed in the rotary holding member has a size greater than that between block 34 and plate 48 a yoke clamp 55 is provided. Yoke clamp 55, as shown in Figure 1, has a pair of facing flanges 56 integrally formed on its legs, each of the flanges 56 entering a respective groove 57 laterally positioned on rectangular block 34. A screw 58 is rotatable in a threaded hole 59 in yoke 55, screw 58 serving the same purpose as the screws in plate 48, namely, to clamp the workpiece against the surfaces of the V-shaped groove in rectangular block 34. It will, of course, be necessary to remove plate 48 from rectangular block 34 when yoke 55 is being utilized.
Rectangular block 34 is secured in disc 33 by means of a clamp 59A (shown in outline in Figure 2) which slides in the broader portion of groove 45 and grabs against the shoulders of that groove when a pair of screws 59B (shown in outline in - , Figure 2) positioned in holes 59C (see Figure 2) ln block 47 are rotated so as to more deeply penetrate a pair of threaded holes in clamp 59A. The head of each of the screws sits on a shoulder within the respective hold 59C, the body of each screw extending into a respective threaded hole in the clamp 59A.
Block 34 is movable along groove 45 when the screws 59B are loosened.
Second support member 16 is slidable in a groove 60 that extends longitudinally in base member 12. A screw 61 extends through an elongated groove 62 in a base portion of second support member 16 and threads into a selected one of a longitudinal series of threaded holes 63 centred in the groove 62.
Second support member 16 comprises a block 65 which is adjustably slidably connected to a base 66 by a slot and groove means. The block 65 has a longitudinal series of threaded holes 67 adapted to selectively house a screw 68. The combination of groove 62, screw 61, and the series of holes 63 allow second support member 16 to assume an infinite number of longitudinal positions along base member 12. Since longitudinal groove 60 is laterally centred in base member 12 and second support member 16 is laterally symmetrical, second support member 16 is also laterally centred in base member 12. In a similar manner, the combination of the series of threaded holes 67 extending longitudinally in block 65, screw 68 which is adapted to be selectively housed therein, and the slot and groove means between block 65 and base 66 allow the block 65 to assume an infinite number of vertical positions relative to base 66. With screw 68 loosened, block 65 can move relative to base 66 along a portion of the length of the slot and groove means; if greater adjustment is needed, screw 68 can be removed from the particular threaded hole 67 and placed into an adjacent hole 67. Regarding the slot and groove means between block 65 and base 66, base 66 , 4~() has a vertical ~roove ~not shown) form~d on lts on~ end face and having a shape similar in cross section to that of groove 60;
block 65 has a longitudinal track with a complementary cross section to that of the groove of base 66 on its one end face.
Extending through a longitudlnal bore in the upper portion of block 65 is a pin 70 having a conical end portion which is a 60 degree standard center. A screw 71 extends into a threaded bore in the other end of pin 70, the head of screw 71 being retained in a groove 72 of a bracket 73 fastened by screw 74 to block 65. As screw 71 is rotated, pin 70 is retracted or extended from block 65.
As shown in Figures 1 and 2, base member 12 has a series of longitudinally-extending grooves on that surface adapted to rest upon the working surface of the grinding or milling machine; those grooves comprise a pair of grooves 75 each positioned adjacent to a respective lateral edge of base member 12 and three centrally-located grooves 76. The five longitudinally-extending grooves are also shown in Figures 3 and 7. With reference to Figure 7, the circular shapes 77 represent cylindrical cavities drilled in base member 12 to reduce the overall weight of the holding tool of the subject invention. As also shown in Figure 7, threaded bores 63 into which screw 61 is selectively securable extend through the thickness of base member 12 from the hollow of groove 60 to the hollow of the most centrally-positioned groove 76. The grooves 75 and 76 and the cylindrical cavities 77 improve the friction between that surface of base member 12 and the grinding or milling machine on which base member 12 rests. Base member 12 can be inter-; changed with other base members of greater or lesser length, depending on the requirements of the particular job.
_ g _ .
11'7~4~0 Rotary holding member 14 has groove 45 diametricallyextending on on~ planar surface and a circular groove 80 centred on the other planar surface. Circular groove 80 has an inner periphery 81 and an outer periphery 82, inner pe~iphery 81 having a lip extending therealong as ~hown in Figure 2. A pair of stops 83 are adapted to slide in groove 80, each stop 83 having a clamp connected thereto by a screw such that the lip on the inner periphery of groove 80 may be clamped between a stop 83 and its associated clamp to maintain the stop 83 at a fixed angular position on the disc 33. A pin 85 is slidably mounted on a bracket 86 laterally extending from and integral with support member 13, as shown in Figure 3. Pin 85 is slidable longitudinally on the rotary holding tool such that its one end can be extended into groove 80; when in such extended position, pin 85 allows only limited rotation of . rotary holding member 14.
The circumference of the disc 33 is graduated into 360 divisions, each division representing a degree of relative angle of rotation between support member 13 and rotary : 20 holding member 14. Secured to the outer end of support member 13 by four screws 88 is an indicator bracket 89 having, as shown in Figure 1, an arcuate lip 90 extending as an arcuate continuation of the circumference of disc 33 of rotary holding member 14. Lip 90 is a graduated vernier allowing for accuracy in relative angular displacement between support member 13 and .: rotary holding member 14 of one-twelfth of one degree, i.e. 5 ~ minutes. Each of the vernier markings on lip 90 is offset from : the adjacent marking such that the spacing between the outermost of the 12 equidistantly-spaced markings on the vernier correspond .
. 30 to 35 degrees of rotation of the disc 33 If the central mark on lip 90 and the 20 màrk, for instance, of the disc were first "
, ~
aligned and then the disc rot~ted slightly so that the first adjacent mark on the lip 90 was opposite the 23 mark on the disc, the angle of the disc would be 20 degrees plus 3/35 degrees. Set screw 91 acts as a spindle lock by acting against spindle shaft 31 to prevent relative angular displacement between rotary holding member 14 and support member 13.
Near the outer perimeter of the disc 33 are a series of twenty-four longitudinally-extending bores 92 each angularly displaced by 15, as shown in Figure 3. Longitudinally slidable in support member 13 are a series of three pins 93, the symmetrical axis of the pins lying in the same circular arc as that extending through the symmetrical axis of the bores 92. Pins 93 are angularly displaced from each other relative to the centre of spindle shaft 31 by 20~. One end of each of the pins 93 is machined into a generally triangular cross-sectional shape so as to fit with close tolerance into any of the bores 92. The shoulder formed by the transition of each pin from circular to triangular cross section acts as a stop limiting deeper penetration of the pin into a bore 92 of disc 33. The effect of the difference in relative angular displacement between each adjacent pair of bores 92 and each adjacent pair of pins 93 is to create a rapid, facile means for angularly displacing rotary holding member 14 at 5 increments relative to support member 13. The 5 increments result when pins 93 are sequentially inserted into rotary holding member 14. With reference to Figure 3, the 5 increments are obtained by repeatedly inserting in left to right order the three pins 93, i.e. left, centre, right, left, centre, right, left, etc. If the 5 increments are desired in movement of the wheel in the opposite direction, right to left order of insertion of the pins 93 is used, i.e. right, centre, left, right, centre, . . . ~ .
:, left, right, etc. The pins 93 are the series of bores 92 have together been previously referred to as releasable angular locking means 15.
; Figure 6 illustrates the adaptability of the rotary holding tool of the subject invention. Support member 13 and rotary holding member 14 have been rotated such that a workpiece 50 positioned therein is rotated in the horizontal plane. A
pair of support brackets 95 have each been affixed to a respective side of support member 13 by a pair of screws 96 placed into the threaded holes 97 of Figure 1. In the configuration of Figure 6 pin 85 has been previously removed from bracket 86 and handle 36 removed from the end of spindle shaft 31. Rotary holding member 14 is rotated relative to support member 13 by hand in this configuration, and releasable ~ angular locking means 15 as well as the vernier fine adjustment ; that utilizes arcuate lip 90 are both operable.
; Figure 8 is a side view of the rotary holding tool of l.i the subject invention but illustrating a different rotary holding member than that shown in Figure 2. The alternate rotary :
holding member of Figure 8 is a three-piece "li~e centre"
- construction compriging an internally-threaded shaft 100 and a hollow shaft 101, both shafts 100 and 101 having an outer diameter sized such that they are insertable within the cylindrical cavity of spindle shaft 31 and having an integral lip on one of their ends such that a bolt 102 extending :
-~- through shaft 101 can be rotated into the threaded bore of shaft 100; when bolt 102 is tightened, shaft 100 rotates with handle 36. One end of shaft 100 is conical-shaped, and a workpiece can be retained between that conical end portion and the conical end portion of pin 70.
. ,~, .
i - 12 -,:"
.',, .
a~v The operation of the subject invention will next be described. It should be obvious to a person skilled in the art that the rotary holding tool of the subject invention has the capability of producing all of the dies shown in Figure 9.
The base portion of each die is a portion of the steel stock (of circular, square, hexagonal or other cross section) adapted to be retained in block 34 of rotary holding member 14. The other portion of each die in Figure 9 is formed by selectively angularly-displacing the die while acting on the die with a grinding or milling machine. A selected length is cut from the steel stock and the selected material is placed against the inclined surfaces of the V-shaped groove in block 34 of rotary holding member 14. Screws 52 are tightened against an insert (51 in Figure 1) which holds the selective workpiece 50 firmly in block 34. As earlier described, if the workpiece is of very large cross section plate 48 is removed from block 34 and yoke 55 is applied to block 34 such that itsflanges 56 extend ,- into grooves 57. With yoke 55 in position the workpiece will be held between the inclined surfaces of the V-shaped groove in block 34 and an insert tnot shown) against which screw ' 58 acts.
Once the location of the axis of symmetry of the portion of the workpiece to be machined has been determined, ` the screws in holes 59C are loosened and block 34 is slidably displaced along groove 45 of disc 33. With reference to Figure 9td) the axis of symmetry of the cylindrical stock ~' placed into block 34 is offset from the axis of symmetry o,f n~ spindle shaft 31 by an amount "x", the screws in holes 58 ' , .
are then tightened. As will be obvious to a person skilled in the art, the die with the eccentric offset of Figure 9(d) will be formed when a grinding wheel is brought adjacent to the retained stock and rotary holding member 14 i9 rotated.
Similarly, the die of Figure 9(b) i9 machined by displacing the axis of symmetry of the stock by a distance "y" from the axis of rotation of spindle shaft 31. In the case of the die shown in Figure 9(b) the axis of symmetry of the stock is, however, alternately displaced the distance "y" in both , 10 directions along groove 45 from the axis of symmetry of spindle shaft 31. The purpose of pin 85 and the pair of stops 83 should now be obvious. Stops 83 can be adjusted such that rotary holding member 14 is rotatable only through 180 so as to place semi-cylindrical surfaces on the die of Figure 9(b).
, After the grinding of the two semi-cylindrical surfaces have been completed the arcuate or straight surfaces connecting ; those semi-cylindrical surfaces can then easily be ground or milled to shape.
It should be obvious that the dies of Figure 9(a), (c), (e), (f), and (g) can be constructed with the axis of `i~ symmetry of the stock positioned in-line with the axis of ; symmetry of spindle shaft 31. Utilizing releasable angular - locking meansl5,5 increments in rotation of rotary holding member 14 are possible and also multiples of 5 increments.
For instance, the die of Figure 9(a) is formed by utilizing the same pin 93 positioned sequentially in four equi-angularly ; spaced bores 92. The die of Figure 3(c) would utilize the same pin 93 positioned sequentially in six equi-angularly spaced bores 92, while the dies of Figures 9(e), (f), and (g) would . ~
utilize 8, 3, and 12 equi-angularly spaced bores 92, respectively.
When a die or other workpiece is being machined ~hich does not re~uire the axis of rotation of the workpiece to be offset from the axis of rotation of spindle shaft 31, block 34 or both block 34 and disc 33 may be removed from the rotary holding tool; disc 33 is removed by loosening the four screws holding it to the collar 32 of spindle shaft 31. With shafts 100 and 101 of the "live centre" positioned in spindle shaft 31 the workpiece can be retained between the conical end portion of shaft 100 and the conical end portion of pin 70,as shown in Figure 8. Thisholding arrangement can be very advantageous when the whole length of a workpiece is to be machined and the presence of block 34 would present a hindrance to such machining. Workpieces of diverse lengths can be accommodated by varying the longitudinal position of second support member 16 on base 12 and, if necessary, inter-changing base 12 for a longer or shorter base.
,....
As shown in Figure 10, the rotary holding tool of the subject invention is secured to the bed of a grinding machine such that the workpiece held by the rotary holding tool extends parallel to the axis of rotation of the grinding wheel. The lowermost point on the grinding wheel is vertically positioned slightly below the uppermost surface of the workpiece such that grinding takes place when the axis of rotation of the grinding wheel is horizontally offset from the axis of symmetry of the workpiece by 0.030 inches. With the grinding wheel maintained in that position, such that it is slightly horizontally offset from being positioned directly above the workpiece, the workpiece is slowly rotated and simultaneously the bed of . . .i ~ - 15 -.
~' the grinding machine moves the rotary holding tool and the affixed workpiece normal to the plane of the grinding wheel.
Persons skilled in the art would be very familiar with ~ proper grinding techniques.
; Radius dresser attachment 17 was mentioned previously.
,i When its one end is fitted into the V-shaped groove of block 34, ~` it is used to dress grinding wheels, as shown in Figures 4 and 5.
Unlike the relative positioning of the grinding wheel and the rotary holding tool in Figure 10, the rotary holding tool is rotated such that its longitudinal axis is in the plane of the ,~!" grinding wheel. Radius dresser attachment 17 has a grinding ~' wheel cutter 105 positioned at its outer end and adapted to be brought against the periphery of the grinding wheel as shown in Figure 4. Stops 83 can be utilized to limit rotation of rotary holding member 14 such that one or both edges of the ' grinding while are fully or partially rounded. Figure 5 '~ illustrates a grinding wheel on which one of the edges has been fully rounded. The grinding wheel can subsequently be ~r placed adjacent to the workpiece 106 of Figure 5 so that the rounded profile of the grinding wheel can be transferred to the workpiece.
Although only a few uses of the rotary holding tool of the subject inventionhave been described, a wide range of other uses for the tool should be obvious to a skilled machinist.
Claims (11)
1. A rotary holding tool, comprising:
(a) a base member;
(b) a support member, extending from the base member;
(c) a rotary holding member, rotatably mounted to the support member such that its axis of rotation extends normal to the support member; and (d) releasable angular locking means, adapted to releasably lock the rotary holding member and the support member into a series of relative angular alignment positions, the locking means comprising, firstly, a series of apertures on the rotary holding member, the apertures being positioned at equal radial distances from the axis of symmetry of the holding member and the apertures also being spaced at equal angular intervals there-around, and secondly, a plurality of fasteners on the support member, the fasteners being spaced at equal angular intervals around the axis of symmetry of the holding member, each fastener having a complementary fit with any one of the apertures, the angular positioning of the apertures and the fasteners being such and the number of fasteners being such that when one of the fasteners fits into one of the apertures none of the other fasteners can be fitted into any other of the apertures, the angular separation between adjacent fasteners being greater than the angular separation between adjacent apertures by an angular increment equal to that between adjacent relative angular alignment positions.
(a) a base member;
(b) a support member, extending from the base member;
(c) a rotary holding member, rotatably mounted to the support member such that its axis of rotation extends normal to the support member; and (d) releasable angular locking means, adapted to releasably lock the rotary holding member and the support member into a series of relative angular alignment positions, the locking means comprising, firstly, a series of apertures on the rotary holding member, the apertures being positioned at equal radial distances from the axis of symmetry of the holding member and the apertures also being spaced at equal angular intervals there-around, and secondly, a plurality of fasteners on the support member, the fasteners being spaced at equal angular intervals around the axis of symmetry of the holding member, each fastener having a complementary fit with any one of the apertures, the angular positioning of the apertures and the fasteners being such and the number of fasteners being such that when one of the fasteners fits into one of the apertures none of the other fasteners can be fitted into any other of the apertures, the angular separation between adjacent fasteners being greater than the angular separation between adjacent apertures by an angular increment equal to that between adjacent relative angular alignment positions.
2. A rotary holding tool as in claim 1, wherein each of the fasteners is a pin slidable in the support member, each pin having its symmetrical axis extending parallel to the axis of roation of the rotary holding member, and wherein each of the apertures is a bore extending parallel to the axis of rotation of the rotary holding member, one of the pins being adapted to slide axially to fit into one of the bores to define each of the relative angular alignment positions.
3. A rotary holding tool as in claim 1, wherein the equal angular spacing between apertures is fifteen degrees and the equal angular spacing between fasteners is twenty degrees, the angular spacing between adjacent relative angular alignment positions being five degrees.
4. A rotary holding tool as in claim 1, wherein the rotation of the rotary holding member relative to the support member is limited to a range of angles, the limited rotation resulting from engagement of a pin slidable in the support member with an annular groove extending angularly around the rotary holding member, the length of the annular groove defining the range of angles.
5. The rotary holding tool of claim 1, wherein a portion of the rotary holding member is a disc-shaped member with its symmetrical axis on the axis of rotation, graduated markings extending around a portion of the periphery of the disc-shaped member and along an adjacent portion of the support member to indicate the angular displacement of the holding member relative to the support member.
6. The rotary holding tool of claim 1, wherein the support member is detachably connected to the base member and wherein the base member is one of a set of interchangeable base members, each with a different selected length.
7. The rotary holding tool of claim 5, wherein the graduated markings extending around the periphery of the disc-shaped member and along the support member together comprise a vernier means for adjusting the relative angle between the holding member and the support member to an accuracy of five minutes of angle.
8. The rotary holding tool of claim 1, wherein the support member is positioned normal to the base member such that the axis of rotation of the rotary holding member extends parallel to the base member.
9. The rotary holding tool of claim 1, wherein the support member is positioned parallel to the base member such that the axis of rotation of the rotary holding member extends normal to the base member.
10. The rotary holding tool of claim 5, wherein a second portion of the rotary holding member is a clamping block, the clamping block being fastenable to the end face of the disc-shaped member at positions diametrically located along that end face, the clamping block having means to clamp therein one end of a workpiece.
11. The rotary holding tool of claim 10, and also comprising an elongated attachment for dressing the periphery of a cylindrical grinding wheel, one end of the dressing attachment having a cutter member mounted thereon, the other end of the dressing attachment being adapted to be clamped into the clamping block such that with rotation of the rotary holding member the cutter member of the dressing attachment traces a circular arc, whereby, when the axis of rotation of the rotary holding member is in the plane of the grinding wheel and the cutter member is positioned against the periphery of the grounding wheel, rotation of the rotary holding member causes the cutting member to cut a circular arc on the periphery of the wheel, the radius of the arc being equal to the distance from the cutting edge of the cutter member to the axis of rotation of the rotary holding member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000416994A CA1178460A (en) | 1982-12-03 | 1982-12-03 | Rotary holding tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000416994A CA1178460A (en) | 1982-12-03 | 1982-12-03 | Rotary holding tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1178460A true CA1178460A (en) | 1984-11-27 |
Family
ID=4124079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000416994A Expired CA1178460A (en) | 1982-12-03 | 1982-12-03 | Rotary holding tool |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1178460A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102059605A (en) * | 2010-09-06 | 2011-05-18 | 无锡海特精密模具有限公司 | Surface grinding machine surface R processing fixture |
| CN108237453A (en) * | 2018-04-04 | 2018-07-03 | 温岭市鼎丰工量具有限公司 | A kind of machining tool of vernier caliper |
| CN108714836A (en) * | 2018-05-14 | 2018-10-30 | 宁波明润机械制造有限公司 | A kind of flexible positioning structure of the outer surface raceway groove grinding of thin and long shafts workpiece |
| CN112355799A (en) * | 2020-11-11 | 2021-02-12 | 李和民 | Steel construction processing rust-resistant equipment of polishing |
| CN114029763A (en) * | 2021-12-03 | 2022-02-11 | 重庆红江机械有限责任公司 | Composite drill clamp for machining spray hole of oil nozzle |
| CN114986333A (en) * | 2022-06-07 | 2022-09-02 | 上海航天设备制造总厂有限公司 | Automatic rotation indexing mechanism for box body with complex structure and using method thereof |
| CN115609137A (en) * | 2022-09-27 | 2023-01-17 | 青岛寰宇乾堃航天特种设备有限公司 | Internal support fixture for barrel circumferential seam deflection welding |
-
1982
- 1982-12-03 CA CA000416994A patent/CA1178460A/en not_active Expired
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102059605A (en) * | 2010-09-06 | 2011-05-18 | 无锡海特精密模具有限公司 | Surface grinding machine surface R processing fixture |
| CN108237453A (en) * | 2018-04-04 | 2018-07-03 | 温岭市鼎丰工量具有限公司 | A kind of machining tool of vernier caliper |
| CN108237453B (en) * | 2018-04-04 | 2023-08-25 | 台州鼎丰工量具股份有限公司 | Processing machine tool of vernier caliper |
| CN108714836A (en) * | 2018-05-14 | 2018-10-30 | 宁波明润机械制造有限公司 | A kind of flexible positioning structure of the outer surface raceway groove grinding of thin and long shafts workpiece |
| CN108714836B (en) * | 2018-05-14 | 2024-03-19 | 宁波明润机械制造有限公司 | Flexible positioning structure for grinding outer surface channels of slender shaft workpieces |
| CN112355799A (en) * | 2020-11-11 | 2021-02-12 | 李和民 | Steel construction processing rust-resistant equipment of polishing |
| CN114029763A (en) * | 2021-12-03 | 2022-02-11 | 重庆红江机械有限责任公司 | Composite drill clamp for machining spray hole of oil nozzle |
| CN114029763B (en) * | 2021-12-03 | 2024-01-19 | 重庆红江机械有限责任公司 | Composite drill clamp for processing spray hole of oil nozzle |
| CN114986333A (en) * | 2022-06-07 | 2022-09-02 | 上海航天设备制造总厂有限公司 | Automatic rotation indexing mechanism for box body with complex structure and using method thereof |
| CN114986333B (en) * | 2022-06-07 | 2023-08-15 | 上海航天设备制造总厂有限公司 | Automatic rotary indexing mechanism for box body with complex structure and use method of automatic rotary indexing mechanism |
| CN115609137A (en) * | 2022-09-27 | 2023-01-17 | 青岛寰宇乾堃航天特种设备有限公司 | Internal support fixture for barrel circumferential seam deflection welding |
| CN115609137B (en) * | 2022-09-27 | 2023-09-15 | 青岛寰宇乾堃航天特种设备有限公司 | Inner supporting clamp for displacement welding of circumferential seams of cylinder |
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| MKEX | Expiry |