JP7478039B2 - Tool presetter and machining tool correction calculation method - Google Patents

Description

The present invention relates to a tool presetter used to correct the position of the cutting edge of a machining tool attached to a machining device, and a method for calculating the correction of this machining tool.

Various types of tool presetters have been proposed for correcting the position of the cutting edge of a machining tool, and a representative one is the tool setter for CNC lathes sold by Metrol Co., Ltd. (see Non-Patent Document 1). This tool setter for CNC lathes (e.g., the H series) has a cubic setter body with measuring units provided on the four sides of the setter body, and each measuring unit is provided with a measuring contact unit. When using this tool setter, a support arm is attached to the lathe body of a machine tool (e.g., a CNC lathe), and the tool setter is attached to the tip of this support arm.

When correcting the position of the cutting edge of a machining tool attached to a machine tool in the Z-axis direction (axis direction of the spindle), the machining tool is moved in the Z-axis direction and the cutting edge is brought into contact with the measurement contact part of the first predetermined measurement part (Z-axis measurement part) of the tool setter, the difference between the feed amount of the machine tool in the Z-axis direction and the measurement value of the tool setter is calculated, and this calculated value becomes the correction value in the Z-axis direction of the machining tool attached to the machine tool. When correcting the position of the cutting edge of the machining tool in the X-axis direction (or Y-axis direction), i.e., the front-back direction perpendicular to the axis of the spindle (or the up-down direction perpendicular to the axis of the spindle), the machining tool is moved in the X-axis direction (or Y-axis direction) and the cutting edge is brought into contact with the measurement contact part of the second predetermined measurement part of the tool setter, i.e., the measurement part of the X-axis (or Y-axis) measurement part, the difference between the feed amount of the machine tool in the X-axis (or Y-axis) direction and the measurement value of the tool setter is calculated, and this calculated value becomes the correction value in the X-axis (or Y-axis) direction of the machining tool attached to the machine tool.

Tool setters for CNC lathes in the product lineup on Metrol Co., Ltd.'s website (https://www.metrol.co.jp/products/tool-setter_h/)

However, in the above-mentioned tool setter, because the setter body is attached to a support arm attached to the machine tool, depending on the type and model of the machine tool, a part of the support arm and/or the tool setter may be positioned in the path of movement of the machining tool, causing interference, and it is not possible to measure the positional relationship between the machining tool and the workpiece. In addition, such a configuration in which the tool is attached to the support arm causes mechanical changes over time, and there is a problem that the support arm to which the tool setter is attached may become displaced over time. In addition, a detachable tool setter has a problem that variations in attachment occur, making it impossible to set the machining tool accurately.

The object of the present invention is to provide a tool presetter that eliminates interference with machining tools and can be applied to a variety of machine tools.

Another object of the present invention is to provide a method for calculating corrections for a machining tool that can correct the position of the tool tip while minimizing the effects of mechanical changes over time in the machine tool.

The tool presetter of the present invention comprises a probe measurement device having a device main body that is chucked by a chuck means of a machine tool and a probe portion extending from the device main body, a support member provided on the device main body of the probe measurement device, and a contact member supported by the support member, wherein a spherical portion is provided at an axial intermediate portion of the contact member, a accommodating recess is provided on the base side thereof for accommodating a tip contact portion of the probe portion, and a measurement contact portion is provided on the tip side thereof with which a machining tool of the machine tool comes into contact, and the support member is provided with a support receiving portion for supporting the spherical portion of the contact member,
Furthermore, in order to concentrically hold the base side of the contact member radially inside of the support member, a ring-shaped outer permanent magnet is arranged on the inner circumferential surface of the support member, and a ring-shaped inner permanent magnet is arranged on the outer circumferential surface of the base side of the contact member, the outer permanent magnet and the inner permanent magnet are magnetized in the radial direction, the magnetized magnetic poles of the inner inner circumferential portion of the outer permanent magnet are magnetized to the same pole, the magnetized magnetic poles of the outer outer circumferential portion of the inner permanent magnet are magnetized to the same magnetism, and the magnetized magnetic poles of the inner inner circumferential portion of the outer permanent magnet and the magnetized magnetic poles of the outer outer circumferential portion of the inner permanent magnet are arranged to be the same magnetized and to face each other,
When the probe measuring device is held by the chuck means and the machining tool acts on the measurement contact portion of the contact member, the contact member swings about the spherical portion as a fulcrum, and the accommodating recess on the base side comes into contact with the tip contact portion of the probe portion, and thus the contact of the machining tool with the measurement contact portion of the contact member is transmitted to the tip contact portion of the probe portion of the probe measuring device.

In this tool presetter, it is preferable that the measurement contact portion of the contact member is formed in a ring shape, and that the machining tool of the machine tool is configured to be able to come into contact with the outer peripheral surface, inner peripheral surface, and tip surface of the measurement contact portion. For example, by bringing the machining tool into contact with the outer peripheral surface of this measurement contact portion, it is possible to make corrections in the X-axis (or Y-axis) direction when machining the outer diameter of the workpiece, by bringing the machining tool into contact with the inner peripheral surface, it is possible to make corrections in the X-axis (or Y-axis) direction when machining the inner diameter of the workpiece, and by bringing the machining tool into contact with the tip surface, it is possible to make corrections in the Z-axis direction when machining the workpiece.

In this tool presetter, it is preferable to balance the weight of the base side and the weight of the tip contact side of the contact member approximately evenly around the spherical portion of the contact member. By configuring it in this manner, the contact member can oscillate smoothly and stably, and it is possible to accurately detect when the machining tool has come into contact with the contact member.

Furthermore, a method for calculating compensation for a machining tool of the present invention includes chucking a tool presetter according to any one of claims 1 to 3 into a chuck means of a machine tool, rotating the chuck means in a circumferential direction to bring a machining tool of the machine tool into contact with a measurement contact portion of a contact member of the tool presetter at a plurality of angular positions, and calculating a compensation value for the machining tool using the measurement values of the tool presetter at the plurality of angular positions.

According to the tool presetter of the present invention, the probe measuring device has a probe portion extending from the device main body, the spherical portion of the contact member is supported by a support member, the tip contact portion of the probe portion is accommodated in an accommodation recess provided on the base side of the contact member, and a measurement contact portion with which a machining tool comes into contact is provided on the tip side of the probe portion, and the device main body of the probe measuring device is chucked and held by the chuck means of the machine tool, so there are no support arms or the like around the probe measuring device that would interfere with the machining tool, and the probe measuring device can be used without interfering with the machining tool, and can be applied to various machine tools to correct the position of the machining tool.

In addition, a ring-shaped outer permanent magnet is arranged on the inner surface of the support member, and a ring-shaped inner permanent magnet is arranged on the outer peripheral surface of the base side of the contact member, the outer permanent magnet and the inner permanent magnet are magnetized in the radial direction, the magnetized magnetic poles on the inner inner peripheral portion of the outer permanent magnet are magnetized to the same pole, and the magnetized magnetic poles on the outer outer peripheral portion of the outer permanent magnet are magnetized to the same pole, and the magnetized magnetic poles of the outer permanent magnet and the inner permanent magnet are arranged to be the same pole and facing each other, so that the magnetic repulsive action of the outer permanent magnet and the inner permanent magnet can hold the base side of the contact member concentrically on the radially inner side of the support member.
Furthermore, when the machining tool acts on the measurement contact portion of the contact member, the contact member swings around the spherical portion as a fulcrum, and the accommodating recess on the base side comes into contact with the tip contact portion of the probe portion. Therefore, the contact of the machining tool with the measurement contact portion of the contact member is transmitted to the tip contact portion of the probe portion of the probe measuring device, and the contact of the machining tool can be reliably detected.

According to the method for calculating the correction for a machining tool of the present invention, the tool presetter according to any one of claims 1 to 3 is used by being chucked by the chuck means of the machine tool, so that the same effects as those described above can be achieved. In addition, the machining tool of the machine tool is brought into contact with the measurement contact portion of the contact member of the tool presetter at a plurality of angular positions obtained by rotating the chuck means in the circumferential direction to perform measurement, and the correction value for the machining tool is calculated using the measurement values of the tool presetter at the plurality of angular positions, so that the correction value includes the amount of mechanical displacement over time of the machine tool including the spindle and the chuck means, and there is no variation when the tool presetter is attached, so that the position of the cutting edge of the machining tool can be corrected with high accuracy.

FIG. 1 is a perspective view showing one embodiment of a tool presetter according to the present invention. FIG. 2 is a cross-sectional view showing a state in which the tool presetter of FIG. 1 is held by a chuck means of a machine tool. FIG. 3 is an end view taken along line III-III in FIG. 10 is a simplified cross-sectional view showing a state in which correction is performed in the X-axis direction (outer diameter machining) of a machining tool using the tool presetter of FIG. 1 . 13 is a cross-sectional view showing a state in which the machining tool moves in the X-axis direction (outer diameter machining) and comes into contact with a contact member of the tool presetter and oscillates. FIG. 2 is a simplified cross-sectional view showing a state in which a correction in the Z-axis direction of a machining tool is performed using the tool presetter of FIG. 1 . 13 is a cross-sectional view showing a state in which the machining tool moves in the Z-axis direction and comes into contact with a contact member of the tool presetter and oscillates. FIG. 10 is a simplified cross-sectional view showing a state in which correction is performed in the X-axis direction (inner diameter machining) of a machining tool using the tool presetter of FIG. 1 . 13 is a cross-sectional view showing a state in which the machining tool moves in the X-axis direction (internal diameter machining) and comes into contact with a contact member of the tool presetter and oscillates. FIG.

One embodiment of a tool presetter according to the present invention will be described below with reference to the accompanying drawings. In Figs. 1 and 2, the illustrated tool presetter 2 comprises a probe measuring device 4, a support member 6 attached to the probe measuring device 4, and a contact member 8 supported by the support member 6 so as to be able to swing freely. The probe measuring device 4 comprises a device main body 10 having a cylindrical outer shape and a probe portion 12 extending from the device main body 10, and the probe portion 12 is attached so as to be able to swing freely in any direction, as will be understood from the following description.

Although not shown, the device main body 10 contains a contact signal generating circuit that generates a contact signal, a transmission circuit that transmits the generated contact signal, and the like. A tip contact part 14 is provided at one end (tip) of the probe part 12, and when the probe part 12 comes into contact with the tip contact part 14 and swings, a contact signal is generated and the generated contact signal is transmitted.

The support member 6 includes a support body 18 having a hollow space 16, a tip wall 20 provided at one axial end (tip side) of the support body 18, a support receiving portion 22 provided on the tip wall 20, and the inner peripheral surface of the support receiving portion 22 formed in a spherical shape. A base end wall 24 is provided at the other end 8 (base end side) of the support body 18, and the base end wall 24 is attached to the device body 10 of the probe measurement device 4. A through opening 26 is provided in the center of the base end wall 24 of the support member 6, and the tip side of the probe portion 12 of the probe measurement device 4 extends into the hollow space 16 of the support member 6 through the through opening 26 of the base end wall 24.

The contact member 8 is cylindrical and has a spherical portion 32 in the axial middle, which is supported by the support receiving portion 22 of the support member 6 so that it can swing freely in any direction. One end (tip side) of the contact member 8 protrudes outward from the tip of the support member 6, and a measurement contact portion 34 is provided at this protruding end. The measurement contact portion 34 is formed in a ring shape, and a circular recess 36 is provided on its tip surface.

The other end (base side) of the contact member 8 extends toward the probe measurement device 4, and a housing recess 38 is provided at the base end 37, extending axially from the base end, into which the tip end (the portion including the tip contact portion 14) of the probe portion 12 of the probe measurement device 4 is inserted. In this embodiment, the opening of the housing recess 38 is enlarged in diameter to prevent portions of the probe portion 12 other than the tip contact portion 14 from contacting the housing recess 38 of the contact member 8 (specifically, its inner peripheral surface).

In this embodiment, the contact member 8 is configured so that the weight of one end (tip side) and the weight of the other end (base side) are almost evenly balanced with the center of the spherical portion 32 in the middle as the fulcrum. Therefore, as can be seen from FIG. 2, the contact member 8 swings smoothly and stably with the spherical portion 32 as the fulcrum, and it is possible to accurately detect when a processing tool 44 (44a to 44c) (e.g., a cutting processing tool) comes into contact with the contact member 8.

In this embodiment, the other end side (base side) of the contact member 8 is configured so as to be concentrically positioned in the hollow space 16 inside the support member 6 as follows. Referring also to FIG. 3, a ring-shaped outer permanent magnet 40 is attached to the inner peripheral surface of the support body 18 of the support member, and a ring-shaped inner permanent magnet 42 is attached to the outer peripheral surface of the base end portion 37 (other end) of the contact member 8, facing radially from the outer permanent magnet 40. As shown in FIG. 3, the inner peripheral portion of the outer permanent magnet 40 and the outer peripheral portion of the inner permanent magnet 42 are configured to face radially with the same magnetic pole (e.g., N pole).

To be more specific, the outer permanent magnet 40 is magnetized in the radial direction, and four parts (i.e., four parts spaced at 90 degrees) at its inner circumferential part in the radial direction are magnetized to the N pole as shown in FIG. 3, for example. The inner permanent magnet 42 is also magnetized in the radial direction, and four parts (i.e., four parts spaced at 90 degrees) at its outer circumferential part in the radial direction are magnetized to the N pole as shown in FIG. 3, for example. By configuring in this way, the N pole of the inner circumferential part of the outer permanent magnet 40 and the N pole of the outer circumferential part of the inner permanent magnet 42 face each other in the radial direction. Therefore, a magnetic repulsion action occurs over substantially the entire circumference of the inner circumferential part of the outer permanent magnet 40 and the outer circumferential part of the inner permanent magnet 42, and due to this magnetic repulsion action, when the machining tool 44 does not act on the contact member 8, the other end side (base side) of the contact member 8 is held concentrically on the radial inside of the support body 18 of the support member 6 as shown in FIG. 2 and FIG. 3.

In this embodiment, four circumferential areas are magnetized, but the number of magnetized areas may be any number; for example, six or eight circumferential areas may be magnetized at substantially equal intervals.

This tool presetter 2 is attached to the chuck means 46 of a CNC lathe, which is an example of a machine tool. When a four-jaw chuck is used as the chuck means 46, the chuck means 46 has four chuck jaw members 48 (only two of which are shown in FIG. 2) spaced apart in the circumferential direction, and the device body 10 of the tool presetter 2 is chucked and held between these four chuck jaw members 48. Although not shown, a three-jaw chuck can also be used as the chuck means, in which case the chuck means has three chuck jaw members spaced apart in the circumferential direction, and the device body 10 of the tool presetter 2 is chucked and held between these three chuck jaw members.

The position correction of the machining tools 44 (44a to 44c) by the tool presetter 2 is performed, for example, as follows. For example, when performing external diameter machining of a workpiece, when correcting the position of the machining tools in the X-axis direction of the machine tool 62, as shown in FIG. 2, the tool presetter 2 (specifically, the device body 10 of the probe measuring device 4) is attached to the chuck means 46 of the machine tool 62 (e.g., a CNC lathe). Then, the position correction in the X-axis direction during external diameter machining with the machining tool 44a is performed as shown in FIG. 2, FIG. 4, and FIG. 5.

The machining tool 44a is positioned radially (in the X-axis direction) outside the measurement contact portion 34 of the contact member 8 as shown by the dashed line 44a in Figure 2, and the tool mounting table 64 is moved from this position in the X-axis direction (see Figure 4) to bring the tool cutting edge 50a of the machining tool 44a into contact with the outer circumferential surface of the measurement contact portion 34. When the tool cutting edge 50a moves in the direction shown by the arrow 66 and contacts the measurement contact portion 34, as shown in Figure 5, the measurement contact portion 34 of the contact member 8 moves downward with the spherical portion 32 as a fulcrum and rotates slightly clockwise in Figure 5, whereby the base end portion 37 moves upward in Figure 5.

In this way, the receiving recess 38 (the inner peripheral surface that defines this receiving recess 38) of the base end 37 of the contact member 8 comes into contact with the tip contact portion 14 of the probe portion 12 of the probe measuring device 4, and the moving contact of the machining tool 44a is transmitted to the probe portion 12 of the probe measuring device 4 via the contact member 8, allowing the contact position of the probe measuring device 4 with the probe portion 12 to be accurately measured, and this contact position becomes the measurement value in the X-axis direction of the probe measuring device 4.

In this embodiment, the position of the machining tool 44a in the X-axis direction is corrected by using the probe measuring device 4 to measure the contact position of the machining tool 44a with the measurement contact portion 34 of the contact member 8 in the same manner as described above at four angular positions obtained by rotating the chuck means 46 at 90-degree intervals in the circumferential direction. The measurements of the probe measuring device 4 at these four angular positions are then calculated to calculate an average value, and the calculated average measurement value becomes the measurement value by the probe measuring device 4. This average measurement value is used to calculate a correction value (X-axis direction) for the machining tool 44a in the same manner as in the conventional method, and when the workpiece is actually machined, the position of the machining tool 44a in the X-axis direction is corrected with this correction value.

This correction value (X-axis direction) for the machining tool 44a is calculated using the average value of the measured values at four angular positions in the circumferential direction of the chuck means 46 of the machine tool 62 when the tool presetter 2 is held by the chuck means 46, so it also takes into account the amount of mechanical displacement over time of the machine tool 62, including the spindle (not shown) and the chuck means 46. Therefore, by using such a correction value, the position of the tool cutting edge 50a of the machining tool 44a can be corrected with high precision when machining the outer diameter.

When performing position correction of the machining tool 44 in the Z-axis direction of the machine tool 62, such as when machining the end face of a workpiece, the tool presetter 2 is attached to the chuck means 46 of the machine tool 62 (e.g., a CNC lathe) as shown in FIG. 2. Then, position correction in the Z-axis direction when using the machining tool 44 to machine, for example, the end face, is performed as shown in FIGS. 2, 6, and 7.

The machining tool 44 is positioned outside the measurement contact portion 34 of the contact member 8 in the Z-axis direction as shown by the dashed line 44b in Figure 2, and the tool mounting table 64 is moved from this position in the Z-axis direction (see Figure 6) to bring the tool tip 50b of the machining tool 44b into contact with the tip surface of the measurement contact portion 34. When the tool tip 50b moves in the direction shown by the arrow 72 and contacts the measurement contact portion 34, as shown in Figure 7, the measurement contact portion 34 of the contact member 8 moves upward with the spherical portion 32 as a fulcrum and rotates slightly counterclockwise in Figure 7, which causes the base end portion 37 to move downward in Figure 7.

In this way, the receiving recess 38 of the base end 37 of the contact member 8 comes into contact with the tip contact portion 14 of the probe portion 12 of the probe measuring device 4, and the moving contact of the machining tool 44b is transmitted to the probe portion 12 of the probe measuring device 4 via the contact member 8, and this contact position becomes the measurement value in the Z-axis direction of the probe measuring device 4.

As for the position correction in the Z-axis direction of the machining tool 44b, as in the case of the X-axis direction, the chuck means 46 is rotated in the circumferential direction at 90 degree intervals to four angular positions, and the contact position of the machining tool 44b with the measurement contact portion 34 of the contact member 8 is measured by the probe measuring device 4 in the same manner as described above. The measurements of the probe measuring device 4 at these four angular positions are then calculated to calculate an average value, and the calculated average measurement value becomes the measurement value in the Z-axis direction by the probe measuring device 4. This average measurement value is used to calculate a correction value (Z-axis direction) for the machining tool 44b in the same manner as in the conventional method, and when actually machining, for example, the end face of the workpiece, the position of the machining tool 44a in the Z-axis direction is corrected with this correction value.

This correction value (Z-axis direction) for the machining tool 44b is calculated using the average value of the measured values at four circumferential angular positions of the chuck means 46 when the tool presetter 2 is held by the chuck means 46 of the machine tool 62. This also takes into account the amount of mechanical displacement over time of the machine tool 62, including the spindle (not shown) and the chuck means 46. For example, when machining an end face, the position of the tool cutting edge 50b of the machining tool 44b can be corrected with high precision.

When performing position correction of the machining tool 44 in the X-axis direction of the machine tool 62, such as when machining the internal diameter of a workpiece, the tool presetter 2 is attached to the chuck means 46 of the machine tool 62 (e.g., a CNC lathe) as shown in FIG. 2. Then, position correction in the X-axis direction when machining the internal diameter with the machining tool 44 is performed as shown in FIGS. 2, 8, and 9.

The machining tool 44 (in this case, an internal diameter machining tool is used instead of an external diameter machining tool, but for ease of understanding, the same reference numbers "44" or "44c" are used) is positioned inside the Z-axis direction of the measurement contact portion 34 of the contact member 8 (inside the ring-shaped measurement contact portion 34) as shown by the dashed line 44c in FIG. 2, and the tool mounting table 64 is moved from this position in the X-axis direction (see FIG. 8) to bring the tool cutting edge 50c of the machining tool 44c into contact with the inner peripheral surface of the measurement contact portion 34. When the tool cutting edge 50c moves in the direction shown by the arrow 82 and contacts the inner peripheral surface of the circular recess 36 of the measurement contact portion 34, as shown in FIG. 9, the measurement contact portion 34 of the contact member 8 moves upward with the spherical portion 32 as a fulcrum and rotates somewhat counterclockwise in FIG. 9, whereby the base end portion 37 moves downward in FIG. 9.

As a result, similar to the movement in the Z-axis direction described above, the accommodating recess 38 of the base end 37 of the contact member 8 comes into contact with the tip contact portion 14 of the probe portion 12 of the probe measuring device 4, and the moving contact of the machining tool 44b is transmitted to the probe portion 12 of the probe measuring device 4 via the contact member 8, and this contact position becomes the measurement value in the X-axis direction of the probe measuring device 4.

As for the position correction of the machining tool 44b in the X-axis direction (internal diameter machining), the chuck means 46 is rotated 90 degrees in the circumferential direction at four angular positions using the probe measuring device 4, and the average value of the measurements of the probe measuring device 4 at the four angular positions is calculated. The calculated average measurement value becomes the measurement value in the X-axis direction (internal diameter machining) by the probe measuring device 4. Then, using this average measurement value, a correction value (X-axis direction) of the machining tool 44c is calculated in the same manner as in the past, and when the workpiece is actually machined in the internal diameter, the position of the machining tool 44c in the X-axis direction is corrected with this correction value. This correction value also takes into account the amount of mechanical displacement over time of the machine tool 62 including the shaft (not shown) and the chuck means 46, and for example, the position of the tool tip 50b of the machining tool 44b can be corrected with high precision when machining the internal diameter.

The above describes the tool presetter according to the present invention and the method for calculating corrections for a machining tool using the same, but the present invention is not limited to such an embodiment, and various modifications and changes are possible without departing from the scope of the present invention.

For example, in the above-described embodiment, the measurement contact portion 34 of the contact member 8 is formed in a ring shape, but is not limited to such a shape and may be formed, for example, in a solid cylindrical shape. When a solid cylindrical contact member is used, it can be applied to position correction in outer diameter machining and position correction in end face machining.

In addition, for example, in the above-described embodiment, the permanent magnets 40 on the support member 6 side and the permanent magnets 42 on the contact member 8 are held concentrically by utilizing the magnetic repulsion between them, but instead of this configuration, they may be held concentrically by a mechanical holding structure (for example, a holding structure using multiple springs).

In addition, for example, in the above-described embodiment, the probe measuring device 4 measures at four locations around the circumference of the chuck means 46 (four angular positions spaced apart around the circumference), but this number is not limited to this, and it may be less than four locations, for example, three locations, or more than four locations, for example, six or eight locations.

In the above-described embodiment, a method for calculating corrections for a machining tool was described using the tool presetter 2 shown in Figures 1 to 9, but this correction calculation method can also be applied when a tool presetter with a different form is used.

Furthermore, this machining tool correction calculation method can also be applied when using a probe measuring device 4 used in the tool presetter 2 instead of the tool presetter 2. In this case, even if the device body 10 of the probe measuring device 4 is chucked and held in the chuck means 46 of the machine tool, and the machining tool 44 of the machine tool is brought into contact with the probe portion 12 of the probe measuring device 4 at multiple angular positions by rotating the chuck means 46 in the circumferential direction, the correction value of the machining tool 44 can be calculated using multiple measurement values of the probe measuring device 4 in the same manner as described above.

2 Tool presetter 4 Probe measuring device 6 Support member 8 Contact member 10 Device main body 12 Probe portion 14 Tip contact portion 32 Spherical portion 34 Measurement contact portion 40 Outer permanent magnet 42 Inner permanent magnet 44, 44a, 44b, 44c Machining tool 46 Chuck means 50a, 50b, 50c Tool cutting edge 62 Machine tool

Claims (4)

a probe measurement device including a device main body that is chucked and held by a chuck means of a machine tool and a probe portion extending from the device main body; a support member provided on the device main body of the probe measurement device; and a contact member supported by the support member, wherein a spherical portion is provided at an axial intermediate portion of the contact member, a receiving recess is provided on the base side thereof for receiving a tip contact portion of the probe portion, and a measurement contact portion is provided on the tip side thereof with which a machining tool of the machine tool comes into contact, and the support member is provided with a support receiving portion for supporting the spherical portion of the contact member,
Furthermore, in order to concentrically hold the base side of the contact member radially inside of the support member, a ring-shaped outer permanent magnet is arranged on the inner peripheral surface of the support member, and a ring-shaped inner permanent magnet is arranged on the outer peripheral surface of the base side of the contact member, the outer permanent magnet and the inner permanent magnet are magnetized in the radial direction, the magnetized magnetic poles of the inner inner peripheral portion of the outer permanent magnet are magnetized to the same pole, the magnetized magnetic poles of the outer outer peripheral portion of the inner permanent magnet are magnetized to the same pole, and the magnetized magnetic poles of the inner inner peripheral portion of the outer permanent magnet and the magnetized magnetic poles of the outer outer peripheral portion of the inner permanent magnet are arranged to be of the same pole and to face each other,
a machining tool presetter for measuring a position of a workpiece by using a machining tool having a diameter of 10 mm or more and a diameter of 15 mm or more, the machining tool being adapted to machine a workpiece having a diameter of 10 mm or more and a diameter of 15 ... The tool presetter according to claim 1, characterized in that the measurement contact portion of the contact member is formed in a ring shape, and the machining tool of the machine tool is configured to be able to contact the outer peripheral surface, inner peripheral surface, and tip surface of the measurement contact portion. The tool presetter according to claim 1 or 2, characterized in that the weight of the contact member on the base side and the weight of the tip contact part side are almost evenly balanced around the spherical part. 4. A method for calculating compensation for a machining tool, comprising: chucking the tool presetter according to any one of claims 1 to 3 in a chuck means of a machine tool; rotating the chuck means in a circumferential direction to bring a machining tool of the machine tool into contact with a measurement contact portion of a contact member of the tool presetter at a plurality of angular positions, and calculating a compensation value for the machining tool using measurement values of the tool presetter at the plurality of angular positions.

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