M value measuring device and measuring method for involute internal and external gears and internal splines

Abstract

The invention discloses a device and a method for measuring M values of involute internal and external gears and internal splines, relates to the technical field of involute gear measurement, and solves the problem that the M values of large-size products cannot be measured by the existing measurement of the measured M values. The limiting seat, the optical axis supporting seat, the positioning block and the connecting seat are used for fixing the three-pipe frame structure; the three-pipe frame structure comprises a supporting pipe and two hollow optical shafts; after the two hollow optical shafts penetrate through two holes of the limiting seat, the positioning block and the optical shaft supporting seat respectively, the positioning block is fastened through screws, and locking of the two hollow optical shafts is achieved; the supporting pipe sequentially penetrates through the through holes in the tops of the two connecting bases to be parallel to the two hollow optical shafts, and the bottoms of the two connecting bases are fastened through the positioning blocks and the optical shaft supporting bases respectively. The measuring device provided by the invention solves the problem of measurement of the ultra-large modulus gear, and adopts a cake shape, and the maximum diameter of the measuring head can be 100 mm.

Description

Technical Field

[0001] The present invention relates to the technical field of involute gear measurement, and in particular to a device and method for measuring the M value of involute internal and external gears and internal splines. Background Art

[0002] In actual production, when the diameter of the measuring ball or measuring rod for measuring M value is greater than When measuring the M value of a product, the traditional online M value gauge cannot achieve online detection. Since such gears are generally oversized and overweight, when the operator holds the product and uses the online gauge to measure the M value, the operator cannot control the force of the product. Therefore, the real data of the product cannot be obtained.

[0003] Since the current handheld online inspection tool cannot measure the M value of the product, the diameter of the measuring ball is greater than The inspection tool is not light in structure, high in strength and can be used to measure the M value of 150 mm to 1000 mm, or the ball diameter of Measurements in the range of mm to 100 mm.

[0004] Therefore, in order to solve the measurement problem of large-module and large-size involute gears, the present invention designs an M-value gauge with a three-tube triangular frame support structure, which fills the gap in the M-value span size greater than 200 mm to 1000 mm. Summary of the Invention

[0005] In order to solve the problem that the existing detection of measuring M value cannot realize the measurement of M value of large-sized products, the present invention provides an M value measuring device and method for involute internal and external gears and internal splines.

[0006] A device for measuring the M value of involute internal and external gears and internal splines, the device comprising a three-tube frame structure, a probe assembly, a limit seat for fixing the three-tube frame structure, an optical axis support seat, a positioning block and a connecting seat;

[0007] The three-tube frame structure includes a support tube and two hollow optical shafts;

[0008] After the two hollow optical shafts pass through the two holes of the limit seat, the positioning block and the optical shaft support seat respectively, the positioning block is fastened by screws to achieve locking of the two hollow optical shafts;

[0009] The support tubes are sequentially passed through the through holes on the tops of the two connecting seats and installed parallel to the two hollow optical axes. The bottoms of the two connecting seats are fastened by positioning blocks and optical axis support seats respectively.

[0010] A sliding optical axis support seat is installed on the two hollow optical axes, and a spring is installed on the sliding optical axis support seat and is limited by a limit seat;

[0011] The probe assembly includes a probe connecting rod respectively mounted on the sliding optical axis support seat and the lower part of the optical axis support seat, an M value probe mounted on the probe connecting rod, and a measuring block mounted on the connecting seat via a measuring block support; the probe of the micrometer is placed on the end face of the measuring block;

[0012] A sliding optical axis support seat moving device is installed at one end of the support tube. The sliding optical axis support seat is pushed to move by the moving device, thereby driving the M-value probe to move, so that the M-value probe is away from the M-value probe installed on the optical axis support seat, thereby placing the two M-value probes into the tooth grooves of the measured part. The moving device is released, and the sliding optical axis support seat moves under the action of the spring force. At this time, the value displayed on the micrometer is the M value of the measured part.

[0013] The present invention also provides a method for measuring the M value of involute internal and external gears and internal splines. The method is implemented by the M value measuring device for involute internal and external gears and internal splines. The measuring method is implemented by the following steps:

[0014] Step 1: Use a calibration piece to calibrate the dial indicator. The calibration piece is in a cubic shape, with the long side being the distance between the calibration piece rods and the width being the diameter of the measuring ball.

[0015] Step 2: Use the support tube as a measuring handle, press the button, and the lever swings to push the sliding optical axis support seat to move. The M-value probe installed on the sliding optical axis support seat is away from the other M-value probe installed on the optical axis support seat. The distance between the two M-value probes is greater than the spacing size of the standard rods. Place the two M-value probes in the calibration piece slot, release the button, and the sliding optical axis support seat moves under the action of the spring force until the two M-value probes clamp the calibration piece, and complete the calibration according to the value displayed by the micrometer;

[0016] Step 3: Press the button and place the two M-value probes into the involute tooth groove to be measured. Release the button and the value displayed on the micrometer is the M-value size.

[0017] Beneficial effects of the present invention:

[0018] The measuring device described in the present invention can realize the measurement of ultra-large module gears. Since traditional M-value gauges are used for measuring gears with a module of less than 6 and a maximum diameter of about 250 mm, when the product exceeds the above indicators, firstly, the probe is not easy to process, and secondly, the product is heavy. When the operator moves the product for measurement, the operator picks it up and places it on the gauge for measurement. The operator can operate with one hand for small and light products, but for large products weighing dozens of kilograms, two hands are needed to lift or move them. The product is not easy to operate, the strength of the probe cannot be controlled, and there is no repeatable measurement, resulting in inaccurate measurements. The M-value measuring device (gauging fixture) described in the present invention adopts a triangular frame structure, and the measuring slide adopts a double linear bearing structure to ensure that the measuring slide only moves and does not rotate. In order to reduce weight, the optical axis of the bearing adopts a hollow shaft with a wall thickness of 2.5 mm, and the support tube adopts a seamless steel tube with a wall thickness of 1.5 mm. In this way, the weight of the M-value measuring device does not exceed 7 kilograms while ensuring that the gear diameter is within 500 mm. It can be easily measured by hand. When measuring a gear diameter of 1000 mm, without considering the weight of the special probe, the weight of the M-value measuring device does not exceed 10 kilograms.

[0019] The measuring device of the present invention solves the problem of measuring super-large module gears. It adopts a circular pancake shape and the maximum probe diameter can be 100 mm, which is impossible for traditional M-value gauges.

[0020] The measuring device described in the present invention comprises a three-tube frame structure consisting of a support tube, two hollow optical shafts, a connecting seat, a limit seat, an optical shaft support seat, a positioning block, and a sliding optical shaft support seat. The two hollow optical shafts constitute linear bearings. Because the structure adopts a frame structure, it has the rigidity and strength to resist bending deformation over a certain length. The use of hollow tubes also achieves a certain degree of lightweight, ensuring the operator's operability, thereby solving the problem of online detection of large-sized gears.

[0021] In the measuring device described in the present invention, the probe connecting rod adopts a stepped shaft structure, and an M6 threaded hole is machined at the lower end. When measuring large modulus gears, the measuring ball is machined into a gasket structure, and the inner hole is ground to match the size of the stepped shaft of the probe connecting rod. The M-value probe can be locked by fastening it with a 90° sunken hexagon socket screw, thereby realizing the problem of online detection of large module gears.

[0022] In the measuring device described in the present invention, a lever support, a bearing gasket, a support tube, a lever and a button constitute a sliding optical axis support seat movement device, which uses an assembled lever structure support tube to achieve the required function without affecting the overall strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a device for measuring the M value of involute internal and external gears and internal splines according to the present invention;

[0024] Figure 2 A top view of the M-value measuring device for involute internal and external gears and internal splines according to the present invention;

[0025] Figure 3 The diagram shows the position relationship of the positioning block on the hollow optical axis; (a) is the main view, and (b) is the top view;

[0026] Figure 4 The position relationship diagram of the M-value probe installed on the sliding optical axis support seat; (a) is the side view, and (b) is the main view;

[0027] Figure 5 The position relationship diagram of the M-value probe installed on the optical axis support seat; (a) is the side view, and (b) is the main view;

[0028] Figure 6 A diagram showing the positional relationship between the connecting seat and the positioning block; (a) is a side view and (b) is a main view.

[0029] In the figure: 1. Probe connecting rod, 2. Fastening screw, 3. Bushing, 4. Bead sleeve, 5. Limit seat, 6. Dial seat, 7. Micrometer, 8. Lever support, 9. Bearing gasket, 10. Support tube, 11. Connecting seat, 12. Measuring block, 13. Measuring block support, 14. Lever, 15. Button, 16. M-value probe, 17. Hollow optical axis, 18. Optical axis support seat, 19. Positioning block, 20. Calibration piece, 21. Sliding optical axis support seat, 22. M-value probe fastening screw, 23. Spring limit sleeve, 24. Spring. DETAILED DESCRIPTION

[0030] Specific implementation method 1. Combination Figures 1 to 6 This embodiment describes a device for measuring the M value of involute internal and external gears and internal splines, the device comprising a three-tube frame structure, a probe assembly, a limit seat 5 for fixing the three-tube frame structure, an optical axis support seat 18, a positioning block 19 and a connecting seat 11;

[0031] The three-tube frame structure includes a support tube 10 and two hollow optical shafts 17;

[0032] After the two hollow optical shafts 17 pass through the two holes of the limit seat 5, the positioning block 19 and the optical shaft support seat 18 respectively, the positioning block 19 is fastened by screws to achieve locking of the two hollow optical shafts;

[0033] The support tube 10 passes through the through holes on the top of the two connecting seats 11 in sequence and is installed parallel to the two hollow optical shafts 17. The bottoms of the two connecting seats 11 are respectively fastened with positioning blocks 19 and optical shaft support seats 18;

[0034] The two hollow optical shafts 17 are mounted on a sliding optical shaft support seat 21, and a spring 24 is mounted on the sliding optical shaft support seat 21 and is limited by a limit seat 5;

[0035] The probe assembly includes a probe connecting rod 1 mounted on the lower part of the sliding optical axis support base 21 and the optical axis support base 18, an M value probe 16 mounted on the probe connecting rod 1; and a measuring block 12 mounted on the connecting base 11 through a measuring block support 13; the probe of the micrometer 7 is placed on the end surface of the measuring block 12;

[0036] A sliding optical axis support seat moving device is installed at one end of the support tube 10, and the sliding optical axis support seat 21 is pushed to move by the moving device, thereby driving the M-value probe 16 to move, so that the M-value probe 16 is away from the M-value probe 16 installed on the optical axis support seat 18, thereby placing the two M-value probes 16 into the tooth groove of the measured part, and releasing the moving device. The sliding optical axis support seat 21 moves under the action of the spring 24. At this time, the value displayed on the micrometer is the M value of the measured part.

[0037] In this embodiment, the sliding optical axis support seat moving device includes a lever support 8, a bearing washer 9, a lever 14 and a button 15; the two connecting seats 11 are both symmetrical isosceles triangle structures, and the triangle has a top angle. The hole has a diameter of 1 / 4.5mm, and the hole is penetrated by a support tube 10, which has an outer diameter of 1 / 4.5mm. Inner hole size The inner hole of the support tube 10 is used to install the lever support 8. There is a 10 mm groove on the lever support 8. The wall thickness on both sides of the groove is processed with a diameter of Pin hole, the groove is equipped with bearing spacer 9 and lever 14, the diameter of The cylindrical pin connects the bearing washer 9, lever 14 and lever support 8 as a whole. Two long grooves are machined on the support tube 10. One groove is used to install the lever 14, and the other groove is used to place the button 15 installed on the lever 14. The button is exposed from the position of the groove. When the button 15 is pressed, the position of the sliding optical axis support seat 21 on the measuring device changes, which makes it easier to put the measuring device in. The required function is achieved without affecting the overall strength. The connecting seat 11 is machined with two diameters of The holes of the positioning block 19 are fastened with M5 hexagon socket screws through the two holes and the two M5 threaded holes on the positioning block 19;

[0038] Another connecting seat 11 is fastened to the optical axis support seat 18 by an M5 hexagon socket screw, and they form a three-tube frame structure. The support tube 10 is used to prevent the sliding optical axis support seat 21 and the hollow optical axis 17 from bending the linear bearing and affecting the measurement accuracy. The limit seat 5 locks the hollow optical axis 17 to block the spring 24 installed in the sliding optical axis support seat 21. The spring 24 provides the sliding optical axis support seat 21 with a measuring force to measure the M value.

[0039] In this embodiment, the limit seat 5, optical axis support seat 18, positioning block 19, and sliding optical axis support seat 21 all have double-hole structures with the same hole diameter. The center distance between the double holes is the same and consistent with the outer diameter of the hollow optical axis 17.

[0040] The two holes of the positioning block 19 are processed by wire cutting. The purpose is to pass the light hole of the heavy groove through the screw to rotate the threaded hole on the other side. When the screw is tightened, the two holes are slightly deformed to lock the optical axis. They are connected by a 1 mm groove along the center line of the hole. A diameter of Through hole, there is an M8 threaded through hole on the other side. When the two hollow optical axes 17 pass through the two holes of the limit seat 5, the optical axis support seat 18, and the positioning block 19, insert the M8 screw through The hole is screwed into the M8 threaded hole on the other side and the screw is tightened, and the hollow optical shaft 17 will be locked. The hollow optical shaft 17 is a quenched bearing steel tube with a wall thickness of 3 mm, which is mainly to ensure rigidity and strength while reducing weight.

[0041] There are two fixed blocks 19 in this embodiment. The front positioning block 19 is used to locate the axial dimension when measuring the internal gear. At the same time, it provides support for the spring of the sliding optical axis support seat 21 to measure the force. The rear positioning block realizes the fixation of the three-tube frame structure.

[0042] In this embodiment, it also includes a bushing 3 and a bead sleeve 4. The inner hole diameter of the bead sleeve 4 installed in the inner hole of the bushing 3 is the same as the diameter of the hollow optical shaft 17. The diameter of the hollow optical shaft 17 is 16 mm, and the inner hole diameter of the bushing 3 is 22 mm. The diameter difference is 6 mm. The bead sleeve 4 is expressed as an outer diameter of 22 mm and an inner hole diameter of 16 mm according to the standard. Its steel ball diameter is 3 mm. The sliding optical shaft support seat 21 is transitionally connected to the hollow optical shaft 17 through the bead sleeve 4. The sliding optical shaft support seat 21 and the hollow optical shaft 17 realize a linear bearing motion relationship.

[0043] In this embodiment, a probe connecting rod 1 is respectively installed under the sliding optical axis support seat 21 and the optical axis support seat 18, and the M-value probe 16 is installed on the probe connecting rod 1. There is an M6 threaded hole that is sunken 90° on the end face of the probe connecting rod 1. When the hexagon socket screw is sunk 90° and tightened, the M-value probe 16 is fixed on the probe connecting rod 1.

[0044] In this embodiment, the measuring block support 13 is installed on the triangular end face of one of the connecting seats 11 and is fastened by a hexagonal screw. The measuring block 12 is a stepped pin structure. In the hole, the large end face of the measuring block 12 is the measuring point of the micrometer. The meter base 6 is fastened to the upper side of the sliding optical axis support seat 21. After the micrometer 7 is installed, the probe of the meter is on the large end face of the measuring block 12.

[0045] After the measuring device of the present invention is installed, the measuring device is calibrated using a calibration piece to finally achieve M value measurement.

[0046] Specific embodiment 2: This embodiment is a measurement method for the M value measurement device for involute internal and external gears and internal splines described in specific embodiment 1. The method is implemented by the following steps:

[0047] First, use calibration piece 20 to calibrate the dial indicator 7. Calibration piece 20 is a high-carbon steel cubic structure (calibration piece dimensions are 236 mm long (rod spacing dimension) × 28 mm wide (probe diameter dimension) × 20 mm thick, and all surfaces of the calibration piece are perpendicular to each other). The long side is the calibration piece rod spacing dimension, and the width is the measuring ball diameter dimension. Four quenched plates are fastened on both sides of the width direction. The M-value probe 16 just passes through the slot formed by the quenched plates. The calibration piece width is the same as the probe diameter. When the measuring device is calibrated, the size displayed by the probe is exactly the length dimension of calibration piece 20 (probe alignment in the slot conforms to Abbe's principle).

[0048] Then, press the button 15, the lever 14 swings and pushes the sliding optical axis support seat 21 to move, and the M-value probe 16 installed on the sliding optical axis support seat 21 moves away from the other M-value probe 16 installed on the optical axis support seat 18, so that the distance between the two M-value probes 16 is greater than the rod spacing size, so the two M-value probes 16 can be placed in the calibration part 20 slot. At this time, release the button 15 and the spring 24 is not under force. The sliding optical axis support seat 21 moves under the force of the spring 24 until the two M-value probes 16 clamp the calibration part 20. At this time, if the comparative measurement micrometer can be directly set to zero, the absolute size measurement must use a digital micrometer. The actual length size of the prefabricated calibration part of the digital micrometer is added to the diameter size of the two measuring balls (the tolerance of the measuring ball diameter size is ±0.001).

[0049] For example: when the rod spacing size is 236, the calibration piece size is also exactly 236. At this time, the absolute size measurement means that the digital micrometer can be preset to 236. In this case, the measuring device is aligned when calibrating the piece, and then the reset key is pressed to realize that the micrometer displays 236; when measuring the M value of the gear, the digital micrometer displays the change based on the 236 size. During relative measurement, the measuring device uses the calibration piece to align the piece, and then press the reset key to realize that the micrometer displays 0. When measuring the M value of the gear, the digital micrometer displays the change relative to the 0 size.

[0050] Finally, after completing the calibration of the micrometer 7, remove the standard part, press the button 15, place the two M-value probes 16 on the measuring device into the involute tooth groove to be measured, release the button 15, and the micrometer 7 will display the M-value size. When the micrometer 7 is set to zero, the cross-rod distance value ± the change is displayed, and the actual M value needs to be calculated; and the digital micrometer is preset with the actual length size of the calibration part, and the micrometer directly displays the actual M value of the part.

[0051] The measuring device described in this embodiment is composed of a three-tube frame structure consisting of a support tube, a hollow optical axis and a connecting seat, a limit seat, an optical axis support seat, a positioning block, and a sliding optical axis support seat. The two hollow optical axes constitute a linear bearing. Because the structure adopts a frame structure, it has the rigidity and strength to resist bending deformation over a certain length. The use of hollow tubes also achieves a certain degree of lightweight, ensuring the operator's operability, thereby solving the problem of online detection of large-size gears.

[0052] In the measuring device described in this embodiment, the probe connecting rod adopts a stepped shaft structure, and an M6 threaded hole is machined at the lower end. When measuring large modulus gears, the measuring ball is machined into a gasket structure, and the inner hole is ground to match the size of the stepped shaft of the probe connecting rod. The 16, M value probe can be locked by fastening it with a 90° sunken hexagon socket screw, thereby realizing the problem of online detection of large module gears.

[0053] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A device for measuring the M value of involute internal and external gears and internal splines, characterized by: The measuring device comprises a three-tube frame structure, a probe assembly, a limit seat (5), an optical axis support seat (18), a positioning block (19) and a connecting seat (11) for fixing the three-tube frame structure; The three-tube frame structure includes a support tube (10) and two hollow optical shafts (17); After the two hollow optical axes (17) pass through the two holes of the limit seat (5), the positioning block (19) and the optical axis support seat (18), the positioning block (19) is fastened with screws to achieve locking of the two hollow optical axes; The support tube (10) sequentially passes through the through holes on the tops of the two connecting seats (11) and is installed in parallel with the two hollow optical axes (17), and the bottoms of the two connecting seats 11 are respectively fastened by positioning blocks (19) and optical axis support seats (18); A sliding optical axis support seat (21) is installed on the two hollow optical axes (17), and a spring (24) is installed on the sliding optical axis support seat (21) and is limited by a limit seat (5); The probe assembly comprises a probe connecting rod (1) respectively mounted on the lower part of the sliding optical axis support seat (21) and the optical axis support seat (18), an M value probe (16) mounted on the probe connecting rod (1); and a measuring block (12) mounted on the connecting seat (11) via a measuring block support (13); the probe of the micrometer (7) is placed on the end face of the measuring block (12); A sliding optical axis support seat moving device is installed at one end of the support tube (10), and the sliding optical axis support seat (21) is pushed to move by the moving device, thereby driving the M value probe (16) to move, so that the M value probe (16) is away from the M value probe (16) installed on the optical axis support seat (18), thereby realizing the placement of the two M value probes (16) into the tooth groove of the measured part, and releasing the moving device, the sliding optical axis support seat (21) moves under the action of the spring (24), and at this time, the value displayed by the micrometer (7) is the M value of the measured part.

2. The M-value measuring device for involute internal and external gears and internal splines according to claim 1, characterized in that: The position limiting seat (5), the optical axis support seat (18), the positioning block (19) and the sliding optical axis support seat (21) are all double-hole structures, and the center distances of the double holes are the same.

3. The M-value measuring device for involute internal and external gears and internal splines according to claim 1, characterized in that: The two holes of the positioning block (19) are connected by a groove through the center line of the hole, and a through hole is processed on one side of the two side walls of the groove, and a threaded hole is processed on the other side. When the two hollow optical axes (17) pass through the limit seat (5), the optical axis support seat (18), and the two holes of the positioning block (19), screws are screwed through the through holes into the threaded holes on the other side and the screws are tightened, and the hollow optical axes (17) will be locked.

4. The M-value measuring device for involute internal and external gears and internal splines according to claim 1, characterized in that: It also includes a bushing (3) and a bead sleeve (4); the sliding optical axis support seat (21) is transitionally connected to the hollow optical axis (17) through the bead sleeve (4) installed in the bushing (3), and the sliding optical axis support seat (21) and the hollow optical axis (17) realize linear bearing motion; the diameter of the bead sleeve (4) is the same as the diameter of the hollow optical axis (17).

5. The M-value measuring device for involute internal and external gears and internal splines according to claim 1, characterized in that: The two connecting seats (11) are both isosceles triangle structures, and the support tube (10) passes through the hole at the triangle apex and is parallel to the hollow optical axis (17); each triangle bottom surface is provided with two through holes for fastening with the threaded holes on the positioning block (19) through screws; and fastening with the threaded holes on the optical axis support seat (18).

6. The M-value measuring device for involute internal and external gears and internal splines according to claim 1, characterized in that: The sliding optical axis support seat moving device comprises a lever support (8), a bearing washer (9), a lever (14) and a button (15); the bearing washer (9), the lever (14) and the lever support (8) are connected as a whole through a cylindrical pin; The support tube (10) is provided with two long slots, one for installing a lever (14) and the other for placing a button (15) installed on the lever (14).

7. The M-value measuring device for involute internal and external gears and internal splines according to claim 1, characterized in that: The measuring block support (13) is mounted on the triangular end face of the connecting seat (11) and is fastened by screws. The measuring block (12) is a step pin structure and is mounted on the measuring block support (13). The large end face of the measuring block (12) serves as a measuring point of the micrometer. The meter base (6) is fastened to the side face of the upper end of the sliding optical axis support seat (21). After the micrometer (7) is installed, the probe of the micrometer (7) is placed on the large end face of the measuring block (12).

8. The M-value measuring device for involute internal and external gears and internal splines according to claim 1, characterized in that: A threaded hole sunken 90° is provided on the end surface of the probe connecting rod (1); when the screw sunk 90° is tightened, the M-value probe (16) is fixed on the probe connecting rod (1).

9. The M-value measuring device for involute internal and external gears and internal splines according to claim 1, characterized in that: The support tube (10) is a seamless steel tube with a wall thickness of 1.5 mm, and the two hollow optical shafts (17) are both hollow shafts with a wall thickness of 2.5 mm.

10. A method for measuring the M value of involute internal and external gears and internal splines, characterized by: The method is implemented by the M value measuring device for involute internal and external gears and internal splines according to any one of claims 1 to 9, and is characterized in that the measuring method is implemented by the following steps: Step 1: Use a calibration piece to calibrate the dial indicator. The calibration piece is in a cubic shape, with the long side being the distance between the calibration piece rods and the width being the diameter of the measuring ball. Step 2: The support tube (10) is used as a handle, and the button (15) is pressed. The lever (14) swings to push the sliding optical axis support seat (21) to move. The M-value probe (16) installed on the sliding optical axis support seat (21) is away from another M-value probe (16) installed on the optical axis support seat (18). Then, the distance between the two M-value probes (16) is greater than the spacing size of the standard rod. The two M-value probes (16) are placed in the calibration piece (20) slot, and the button (15) is released. The sliding optical axis support seat (21) moves under the force of the spring (24) until the two M-value probes (16) clamp the calibration piece, and the calibration is completed according to the value displayed by the micrometer. Step 3: Press the button (15) and place the two M-value probes (16) into the involute tooth groove to be measured. Release the button and the micrometer display value is the M-value size.

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