JP2000094322A - Precision grinding machine and grinding wheel radius measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a precision grinding machine and a grinding wheel radius measuring method which are capable of extremely precisely grinding the outer peripheral surface of a workpiece. SOLUTION: First, a touch probe 52 attached to a wheel spindle stock 4 is allowed to abut on a reference block 7 fixed to a headstock 24 to precisely determine the positional relationship between the axis of rotation of a grinding wheel 42 and the axis of rotation of a spindle. Then, the grinding wheel 42 being rotated is brought into contact with a transfer bar 6 to slightly grind the transfer bar 6, and the outside diameter of the grinding wheel is transferred to the transfer bar 6. The position of the tip of the ground transfer bar 6 is measured by the touch probe 52, and the radius of the grinding wheel 42 being rotated is precisely measured. Since the positional relationship between the axis of rotation of the grinding wheel 42 and the axis of rotation of the spindle, and the radius of the grinding wheel, are precisely determined, the position of the radius of the grinding wheel relative to a workpiece held by the spindle can be calculated based on these measured values, and the outer peripheral surface of the workpiece van be extremely precisely ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a grinding machine for precisely grinding an outer peripheral surface of a workpiece with a rotary grindstone.

[0002]

2. Description of the Related Art In a grinding machine equipped with a rotary grinding wheel,
It is necessary to detect the diameter of the grindstone when the grindstone is replaced or when a correction such as truing is performed. Therefore, usually, a grindstone whose rotation has been stopped is brought into contact with a workpiece such as a dummy work or a reference block, and the grindstone diameter is determined from the position of the grindstone table at the time of the contact.

[0003] However, with such a method, it is not possible to determine the grindstone diameter of a rotating grindstone whose diameter has been enlarged by centrifugal force. Therefore, for the purpose of measuring the diameter of the grindstone during rotation, an attempt has been made to detect the moment when the grindstone comes into contact with a dummy work or the like by using an AE sensor (vibration detector). However, a time delay from the contact to the detection signal output or a time delay from the moment of contact detection to the stop of the grinding wheel head occurs, so that it was not possible to accurately measure the diameter of the grinding wheel during rotation. . As a result, extremely precise grinding could not be performed by a conventional grinding machine or grinding wheel radius measuring method.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a precision grinding machine and a grinding wheel radius measuring method capable of grinding the outer peripheral surface of a workpiece with extremely high precision.

[0005]

Means for Solving the Problems In order to solve the above problems, the inventors have invented the following means. (First Means) A first means of the present invention is a precision grinding machine according to claim 1. This means is equipped with a touch probe attached to the grindstone table along the X-axis so as to face the main spindle, and a transfer rod fixed to the headstock so as to be able to contact the touch probe along the X-axis.

Then, the transfer rod is ground with a grindstone, the position X1 of the grindstone base at this time is stored, and the touch probe is brought into contact with the transfer rod after grinding, and the position X2 of the grindstone base at this time is stored.
Is stored. Thereafter, the radius of the rotating grindstone is calculated based on the difference ΔX between the positions X1 and X2 of the grindstone head. Therefore, the radius and the like of the rotating grindstone can be accurately detected.

Therefore, according to the precision grinding machine of this means,
Since the size or position such as the radius of the rotating grindstone can be accurately detected, the outer peripheral surface of the workpiece can be ground very precisely. (Second Means) A second means of the present invention is the grinding wheel radius measuring method according to the second aspect.

That is, the present means has a transfer step, a measurement step, and a calculation step. In the transfer process, the grindstone head of the grinding machine is sent toward the headstock along the X-axis, and the rotating grindstone is brought into contact with the transfer rod fixed to the headstock along the X-axis at right angles to the main spindle. And transferring the outer diameter position of the rotating grindstone to the transfer rod. During the transfer process, the effective outer diameter position of the rotating grindstone is copied to the transfer rod, so by measuring the position of the ground transfer rod tip, the effective outer diameter position of the rotating grindstone is measured. Can be measured. In the transfer process, after the grindstone is cut into the transfer rod by a predetermined amount and ground, the feed of the grindstone table is stopped, and the stop position of the grindstone table in the X-axis direction at this time is X1.

In the measurement process, the grinding wheel head is sent to the headstock along the X-axis, and the touch probe attached to the grinding wheelhead is contacted with the transfer bar along the X-axis and perpendicular to the main shaft, so that the transfer bar is moved. This is a process of measuring the relative distance between the ground tip and the wheel head. By the measurement process, as shown in the following calculation process, the relative distance between the ground end of the transfer rod on which the outer diameter position of the rotating grindstone is transferred and the grindstone table is measured. The relative position between the wheel outer diameter and the wheel head is measured. In the measurement process, the feed of the grindstone is stopped immediately when the touch probe comes into contact with the tip of the transfer rod. The stop position of the grindstone in the X-axis direction at this time is defined as X2.

The calculation process includes a position X1 of the grinding wheel head in the X-axis direction in the transfer process and a position X in the X-axis direction of the grinding wheel head in the measurement process.
2, the difference ΔX = X1−X2 between the position of the outer peripheral surface of the rotating grindstone and the position of the tip of the touch probe is calculated, and the rotation is performed based on the positional relationship between the tip of the touch probe and the rotation axis of the grindstone. This is the process of calculating the radius of the grindstone. Here, the positional relationship between the tip of the touch probe and the axis of rotation of the grindstone has been clarified in design, and has been confirmed by measurement after fabrication. Therefore, from the positional relationship between the tip of the touch probe and the rotation axis of the grinding wheel and the above-described ΔX, the radius of the rotating grinding wheel can be easily calculated by a geometric calculation.

Therefore, according to the grinding wheel radius measuring method of the present invention, since the grinding wheel radius during rotation can be measured precisely, there is an effect that the outer peripheral surface of the workpiece can be ground very precisely. (Third Means) A third means of the present invention is the grinding wheel radius measuring method according to the third aspect.

That is, the present means further includes a preliminary step before the transfer step or after the operation step. In the preliminary process, the grinding wheel head is sent to the headstock along the X axis, and the touch probe is brought into contact with the reference block fixed to the headstock orthogonal to the spindle along the X axis, and This is the process of measuring the reference interval between. The positional relationship between the rotation axis of the grindstone and the touch probe is clear, and the positional relationship between the rotation axis of the main spindle and the reference block is also clear. Is clear on the X axis. The positional relationship between the axis of rotation of the grinding wheel and the axis of rotation of the main spindle on the X axis is clear in design, but during actual operation, there is expansion and contraction of the bed of the grinding machine due to thermal deformation, etc. Precisely, there is an error with the design value. Therefore, the reference distance between the headstock and the grinding wheel head by the preliminary process,
That is, since the interval between the rotation axis of the grindstone and the rotation axis of the main shaft on the X axis is precisely measured, the error can be corrected.

As a result, the distance between the axis of rotation of the grinding wheel and the axis of rotation of the main spindle, which is precisely measured in the preliminary process, on the X axis, and the rotation of the grinding wheel, which is precisely measured by the above-described second means, are described. By combining with the radius, more precise grinding becomes possible. Therefore, according to the grinding wheel radius measuring method of this means, in addition to the effect of the above-mentioned second means, there is an effect that the outer peripheral surface of the workpiece can be ground more precisely.

(Fourth Means) A fourth means of the present invention is the grinding wheel radius measuring method according to the fourth aspect. This means further has a truing start position calculating step after the transferring step, the measuring step, the calculating step and the preliminary step. The truing start position calculation process includes the radius of the rotating grindstone, the above-described reference interval, the positional relationship between the truer fixed to the headstock and the reference block, and the position between the tip of the touch probe and the rotation axis of the grindstone. This is a process of calculating an appropriate truing start position of the grindstone by the truer from the relationship.

In the present means, the position of the grinding surface (outer peripheral surface) of the rotating grindstone with respect to the position of the truer is precisely calculated, so that the truing of the grindstone can be performed in accordance with the desired cutting amount of the truer. is there. As a result, not only can the grindstone be finished to a desired grindstone radius, but also the truing of the grindstone can be performed with an ideal depth of cut without excess or shortage. Therefore, the truing does not become too deep, so that the life of the grindstone is extended. On the other hand, the truing does not become too shallow, so that the finish of the ground surface of the workpiece is improved.

Therefore, according to this means, in addition to the effect of the above-mentioned third means, truing of the grindstone can be performed with an ideal depth of cut without excess or shortage, the life of the grindstone is extended, and the work piece is ground. This has the effect of making the surface finish constant.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the precision grinding machine and the grinding wheel radius measuring method of the present invention will be clearly and fully described in the following examples so that those skilled in the art can understand the present invention. First Embodiment (Configuration of Precision Grinding Machine of First Embodiment) A precision grinding machine as a first embodiment of the present invention has a main shaft 25 that holds and rotates a workpiece W as shown in FIG. Headstock 24 and spindle 2
The grindstone 42 is driven to rotate around the grindstone axis parallel to 5 and the main spindle 2 is rotated.
The wheel head 4 includes a grindstone head 4 that can move in parallel in the X-axis direction and the Z-axis direction relative to the wheelhead 4, and a control device 8 that numerically controls the main shaft 24 and the grindstone head 4.

That is, the headstock 24 and the tailstock 23
Are mounted on the spindle table 2 so as to face each other.
The headstock 24 that holds the workpiece W between the spindle 25 and the tailstock 23 is fixedly mounted on the spindle table 2. The spindle table 2 has guide rails 13 formed on the bed 1.
, And can be moved by a ball screw 14 driven to rotate by a Z-axis motor 15. Therefore, the main spindle 25 is movable in the Z-axis direction with respect to the grinding wheel head 4.

On the other hand, the grindstone table 4 includes a rotating disk-shaped grindstone 42, a grindstone shaft 43 thereof, and a grindstone motor 46 for driving the two 42, 43 to rotate. Along the X-axis. The wheel head 4 is fed in the X-axis direction by a ball screw 18 driven to rotate by an X-axis motor 19. Therefore, the wheel head 4 is movable in the X-axis direction with respect to the main shaft 25.

The main spindle 25, the grinding wheel head 4, etc., and the touch probe 52, the truer 26, etc., which will be described later, are all numerically controlled by the controller 8 precisely and quickly according to a predetermined program. The precision grinding machine of the present embodiment further includes a headstock 24 so that the touch probe 52 attached to the grindstone head 4 along the X-axis and facing the spindle 25 and the touch probe 52 along the X-axis can contact each other. , And a reference block 7 and a transfer rod 6 fixed thereto. In addition, on the side surface of the headstock 24 on the side of the grindstone head 4, a truer 26 having a disk-shaped cutting blade that is rotationally driven by a motor is fixedly provided alongside the reference block 7 and the transfer rod 6. The transfer rod 6 is attached to the pedestal 6 fixed to the headstock 24.
0, and is attached to the pedestal 60 so that it can be easily replaced when the transfer rod 6 is worn.

That is, as shown in FIG. 2, the rotation axis of the grindstone 42 and the rotation axis of the main shaft 25 are at the same height.
The same X-axis is approached or separated by the feed of the grindstone table 4. The reference block 7, the transfer rod 6, and the truer 26 are disposed on the same X-axis so as to be shifted from each other in the Z-axis direction.
6 and the touch probe 52 is L on the same X axis line.
It is held by the arm 53. Therefore, FIG.
When viewed from the side, the reference block 7, the transfer rod 6, the truer 26, and the touch probe 52 appear to be disposed on the same X-axis.

The touch probe 52 has a function of detecting contact with the reference block 7 or the transfer rod 6 when a built-in limit switch is turned on / off by contact with the reference block 7 or the transfer rod 6. . As shown in FIG. 1 again, one end of the L-shaped arm 53 is rotatably supported on the axis of the grindstone 42, and a touch probe 52 is attached to the other end of the L-shaped arm 53. Therefore, the touch probe 52 can take any of the measurement position indicated by the solid line in FIG. 1 and the retraction position indicated by the broken line in FIG. 1, and can move between the measurement position and the retraction position. Here, the L-shaped arm 53 is formed of a low thermal expansion material such as Super Invar.

Since the precision grinding machine of the present embodiment is constructed as described above, extremely precise grinding and truing can be performed as described below. (Method of Measuring Wheel Radius of Example 1) Since the precision grinding machine of the present embodiment is configured as described above, it is possible to carry out the following method of measuring the wheel radius.

That is, as shown in FIG. 3, when the precision grinding machine of the present embodiment is started, the radius of the grinding wheel is precisely measured in processing step S1. The method of measuring the grinding wheel radius will be described later in detail with reference to the drawings. Next, in decision step S2, it is determined whether there is a workpiece to be ground next, and if there is no next workpiece W, the operation is automatically interrupted, and the operator is notified of that. . Next work W
If there is, the workpiece W is carried into the precision grinding machine of the present embodiment and is automatically fixed to the main shaft 25. Then, in the processing step S3, the grinding of the workpieces W is performed while being numerically controlled according to a preset program, and the grinding of the workpieces W is continued until it is determined in the determination step S4 that the processed workpieces W have reached the predetermined number. The grinding of the object W is performed. Workpiece W
When the number of grinding processes reaches the point where the truing of the grindstone 42 is required, the control program proceeds to the processing steps S5, S6, and S7 required for the precise truing through the judgment step S4. The number of grindings of the workpiece W is added by one at the stage when the determination step S4 is entered, and is reset to zero when the determination step S4 determines that the predetermined number has been reached.

In processing step S5, the grinding wheel radius measuring method according to the present embodiment is performed, and the grinding wheel radius and the like are precisely measured. In the subsequent processing step S6, a truing start position as a feed position of the grinding wheel head 4 is calculated in consideration of an appropriate cutting depth, and truing is performed precisely in a processing step S7. The truing start position calculation process in the processing step S6 will be described later again with reference to the drawings.

Here, the grinding wheel radius measuring method of the present embodiment, which is performed in the processing steps S1 and S5 of the above processing flow, will be described with reference to FIGS. 4 (a) to 4 (c). The grinding wheel radius measuring method of the present embodiment has a preliminary process, a transferring process, a measuring process, and a calculating process. In the preliminary process, as shown in FIG. 4A, the grindstone head 4 is sent to the headstock 24 along the X-axis, and is orthogonal to the spindle 25 (see FIG. 1) along the X-axis. This is a process in which the touch probe 52 is brought into contact with the fixed reference block 7 to measure the reference distance between the headstock 24 and the grindstone table 4.

Then, the positional relationship between the rotation axis of the grinding wheel 42 and the touch probe 52 is clear, and the positional relationship between the rotation axis of the main shaft 25 and the reference block 7 is also clear. And the rotational axis of the main shaft 25 on the X axis becomes clear. Here, the whetstone 42
The positional relationship on the X axis between the rotation axis of the spindle and the rotation axis of the main shaft 25 is clear in design, but during actual operation, the bed of the grinding machine expands and contracts due to thermal deformation and the like. Precisely, there is an error with the design value. Therefore, the reference distance between the headstock 24 and the grindstone head 4, that is, the grindstone 42
The distance between the axis of rotation of the main shaft 25 and the axis of rotation of the main shaft 25 on the X axis is precisely measured, so that errors due to thermal deformation and the like can be corrected.

In the transfer process, as shown in FIG. 4B, the grindstone head 4 is fed by a predetermined amount toward the headstock 24 along the X-axis, and is orthogonal to the spindle 25 along the X-axis. In this process, the rotating grindstone 42 is brought into contact with the fixed transfer rod 6, the transfer rod 6 is ground, and the outer diameter position of the rotating grindstone 42 is transferred to the transfer rod 6. By the transfer process, the effective outer diameter position of the rotating grindstone 42 is copied to the transfer rod 6,
By measuring the position of the tip of the ground transfer rod 6, the effective outer diameter position of the rotating grindstone 42 can be measured. In the transfer process, the feed of the grindstone head 4 is stopped immediately after the grinding of the transfer rod 6 is started, and the stop position of the grindstone head 4 in the X-axis direction at this time is defined as X1.

In the measuring process, as shown in FIG. 4 (c), the grindstone head 4 is sent to the headstock 24 along the X-axis, and is attached to the grindstone head 4 along the X-axis at right angles to the main shaft 25. In this process, the touch probe 52 is brought into contact with the transfer rod 6 to measure the relative distance between the ground end of the transfer rod 6 and the grindstone table 4. Depending on the measurement process, as shown in the following calculation process,
Since the relative distance between the ground end of the transfer rod 6 to which the outer diameter position of the rotating grindstone 42 has been transferred and the grindstone table 4 is measured, the outer diameter position of the rotating grindstone 42 and the grindstone table 4 are measured. Is measured. In the measurement process, the touch probe 52
The feed of the grindstone head 4 is stopped immediately when the wheel comes into contact with the tip of the transfer rod 6, and the stop position of the grindstone head 4 in the X-axis direction at this time is defined as X2.

The calculation process is based on the position X1 of the grinding wheel head 4 in the X-axis direction during the transfer process and the position X2 of the grinding wheel head 4 in the X-axis direction during the measurement process. ΔX = X1−X2 between the distance and the position of the tip of the touch probe 52
Is calculated, and the tip of the touch probe 52 and the grindstone 42 are further calculated.
This is the process of calculating the radius of the rotating grindstone 42 from the positional relationship with the rotation axis. Here, the positional relationship between the tip of the touch probe 52 and the axis of rotation of the grindstone 42 has been clarified in design and has been confirmed by measurement after fabrication. Therefore, from the positional relationship between the tip of the touch probe 52 and the rotation axis of the grindstone 42 and the above-described ΔX, the radius R of the rotating grindstone is determined.
Is easily calculated by a geometric operation of R = L−ΔX. Here, L is the length of the L-shaped arm 54 measured along the X axis from the rotation axis of the grindstone 42.

The details of the above process are shown in the flowchart of FIG. As a result, according to the whetstone radius measuring method of the present embodiment, the whetstone radius during rotation can be measured accurately, so that the outer peripheral surface of the workpiece W can be ground extremely precisely. Also, the whetstone 4 precisely measured by the preliminary process
More precise grinding is possible by combining the distance on the X axis between the rotation axis 2 of the spindle 2 and the rotation axis of the main shaft 25 and the radius of the rotating grindstone accurately measured as described above. Become.

Therefore, according to the grinding wheel radius measuring method of the present embodiment, there is an effect that the outer peripheral surface of the workpiece W can be ground very precisely. (Process of Calculating Truing Start Position in First Embodiment)
As shown in (5), the truing start position calculation process is performed as the processing step S6 immediately after the above-described grinding wheel radius measurement method is performed in the processing step S5. The process of calculating the truing start position includes the radius of the rotating grindstone 42, the aforementioned reference interval, the positional relationship between the truer 26 fixed to the headstock 24 and the reference block 7, the tip of the touch probe 52 and the grindstone 42. This is a process of calculating an appropriate truing start position of the grindstone by the truer 26 from the positional relationship with the rotation axis.

In the process of calculating the truing start position, the position of the ground surface (outer peripheral surface) of the rotating grindstone 42 with respect to the position of the truer 26 is precisely calculated.
The truing of the grindstone 42 can be performed in accordance with the cutting depth of the grinding wheel 42. That is, after the grinding wheel radius is precisely measured, the touch probe 52 is brought into contact with the reference block 7 as shown in FIG.
The relative position with respect to the rotation axis of No. 5 is precisely confirmed. Thereafter, as shown in FIG. 6B, based on the feed position of the grindstone table 4 during the previous truing, a value obtained by adding the step D between the reference block 7 and the truer 26 and the reduction amount ΔX of the grindstone radius ( Δ
If only the correction of (X + D) is added, the truing start position can be accurately calculated. At this time, if the touch probe 52 is in the way, by driving the rotating device 58 provided at the root of the L-shaped arm 54, the touch probe 52 can be retracted to perform truing.

As a result, not only can the grinding wheel 42 be finished to a desired grinding wheel radius, but also the truing of the grinding wheel 42 can be performed with an ideal depth of cut without any excess or shortage. Therefore, the truing does not become too deep, so that the life of the grindstone 42 is extended. On the other hand, the truing does not become too shallow, so that the finish of the surface to be ground of the workpiece W is improved.

Therefore, according to the truing start position calculating process of the present embodiment, the truing of the grindstone 42 can be performed at an ideal cutting depth without excess or deficiency.
2 has an effect that the life of the workpiece 2 is extended and the finish of the ground surface of the workpiece W becomes constant. (Effects of Embodiment 1) As described in detail above, according to the precision grinding machine and the grinding wheel radius measuring method of the present embodiment, it is possible to precisely measure the radius of the rotating grinding wheel. Can be ground very precisely. Not only that, if the truing start position calculation process is also adopted, the truing of the grinding wheel can be performed with an ideal depth of cut without excess or shortage, the life of the grinding wheel is extended, and the finish of the ground surface of the workpiece is constant. There is also the effect of becoming.

[Brief description of the drawings]

FIG. 1 is a plan view showing a configuration of a precision grinding machine as a first embodiment.

FIG. 2 is a schematic cross-sectional view illustrating a configuration of a main part of the precision grinding machine according to the first embodiment.

FIG. 3 is a flowchart showing all steps of a grinding process according to the first embodiment.

FIG. 4 is a set diagram showing a grinding wheel radius measuring method as a first embodiment (a) a plan view showing a preliminary process (b) a plan view showing a transfer process (c) a plan view showing a measuring process

FIG. 5 is a flowchart showing a procedure of a grinding wheel radius measuring method according to the first embodiment.

FIG. 6 is a set diagram showing a truing operation of the precision grinding machine according to the first embodiment; (a) a plan view showing a preliminary process; and (b) a plan view showing truing.

[Explanation of symbols]

1: Bed 13: Guide rail 14: Ball screw 15: Z
Shaft motor 17: Guide rail 18: Ball screw 19: X
Axis motor 2: Spindle table 23: Tailstock 25: Spindle 24: Spindle stand 26: Truer 6: Transfer bar 60: Pedestal 7: Reference block 4: Grindstone base 42: Grindstone 43: Grindstone shaft 46: Grindstone motor 50: Touch Probe device 52: Touch probe 53: L-shaped arm 58:
Rotating device 8: Control device

Claims (4)

[Claims] 1. A headstock having a spindle which holds and rotationally drives a workpiece, and a grindstone is driven to rotate around a grindstone axis parallel to the spindle, and is relatively moved in the X-axis direction and the Z-axis direction with respect to the spindle. A grindstone head that can be translated in parallel to the grinding wheel, and a control device that numerically controls the spindle and the grinding stone head, comprising: a touch probe attached to the grinding stone head along the X axis so as to face the spindle. A transfer rod fixed to a headstock so as to be able to contact the touch probe along the X axis; and a grindstone head relatively moved in the X direction with respect to the headstock by a predetermined amount to grind the transfer rod to the grindstone. Transfer rod grinding means, grinding position storage means for storing a grinding wheel position X1 when the transfer rod is ground by the transfer rod grinding means, and the transfer rod grinding means is executed by the transfer rod grinding means. Later, the touch probe is moved to the surface to be ground of the transfer rod. Contact detecting means for detecting the contact with the contact rod; contact position storing means for storing a wheel head position X2 when the touch probe comes into contact with the transfer rod by the contact detecting means; and grinding position storing means. The wheel head position X1 stored in
A grinding wheel radius calculating means for calculating a radius of the rotating grinding wheel based on a difference from the wheel head position X2 stored in the contact position storage means. 2. A grindstone of a grinding machine is sent to a headstock along an X-axis, and a rotating grindstone is brought into contact with a transfer rod fixed to the headstock along the X-axis and orthogonal to the spindle. Transferring the outer diameter position of the rotating grindstone to the transfer rod by grinding the transfer rod, and sending the grindstone head toward the headstock along the X-axis; A measuring step of measuring a relative distance between the ground end of the transfer rod and the grinding wheel base by contacting the transfer probe with a touch probe attached to the grinding wheel base orthogonal to the main shaft along From the position X1 of the grinding wheel head in the X-axis direction during the transfer process and the position X2 of the grinding wheel head in the X-axis direction during the measurement process, the position of the outer peripheral surface of the grinding wheel and the position of the tip of the touch probe ΔX = X1−X2, and further calculating the difference from the positional relationship between the tip of the touch probe and the rotation axis of the grinding wheel. Calculating a radius of the grinding wheel. 3. The grinding wheel head is sent along the X axis toward the headstock before the transfer process or after the calculation process,
A preliminary step of contacting the touch probe with a reference block fixed to the headstock along the X axis and orthogonal to the spindle, and measuring a reference distance between the headstock and the grinding wheel head; The grinding wheel radius measuring method according to claim 2. 4. After the transferring step, the measuring step, the calculating step, and the preliminary step, the radius of the grinding wheel, the reference interval, and the position of the truer fixed to the headstock and the reference block. Relationship
The grinding wheel radius measuring method according to claim 3, further comprising: a truing start position calculating step of calculating a truing start position of the grinding wheel by the truer from the positional relationship between the tip of the touch probe and the rotation axis of the grinding wheel. .