An external cylindrical honing head processing system and method

Abstract

The application relates to the field of mechanical processing and discloses a cylindrical honing head processing system and method, which comprises a honing machine rotating main shaft, a honing head clamp, a transmission rod, a honing door frame and a rod body part; the honing machine rotating main shaft is assembled on a honing machine, one end of the rod body part is fixed on the honing machine rotating main shaft, the rod body part is driven to rotate by the honing machine rotating main shaft, and the rod body part is coaxially arranged with the honing machine rotating main shaft; the honing head clamp is clamped on the rod body part; one end of the transmission rod is assembled on a transmission mechanism, the transmission rod is arranged in parallel with the rod body part, the honing door frame is fixed on the transmission rod, the honing door frame is clamped on both sides of the honing head clamp, and the honing head clamp is driven to move along the rod body part for processing by the honing door frame through the transmission rod; the rod body part is processed by the honing head clamp, the size precision of the outer circle of the rod body part is stable, the processing efficiency is improved, and the processing difficulty and labor intensity of the operator are greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of machining, specifically to a system and method for machining an external cylindrical honing head. Background Technology

[0002] A special structural part without center holes cannot be machined on a grinding machine for external diameter. Due to its irregular shape and lack of center holes at both ends, some parts currently require manual grinding for precision machining. This process presents several problems: improper pressure adjustment of the grinder can easily cause scratches on the part surface; poor control of the grinding stroke can lead to unstable part dimensions and excessive taper tolerances, requiring repeated reworking; grinding paste residue is difficult to remove from grooves and small holes, resulting in inadequate cleanliness control; and grinding efficiency is low. Summary of the Invention

[0003] In order to overcome the defects of the prior art, the present invention aims to provide an external cylindrical honing head processing system and method to solve the technical problems of low grinding quality, unstable quality and difficulty in controlling cleanliness of special structural parts that cannot be machined on a grinding machine due to the lack of center holes.

[0004] This invention is achieved through the following technical solution:

[0005] In a first aspect, the present invention provides an external cylindrical honing head processing system, including a honing machine rotating spindle, a honing head fixture, a transmission rod, a honing gantry, and rod body parts;

[0006] The honing mill's rotating spindle is mounted on the honing mill. One end of the rod part is fixed on the honing mill's rotating spindle, and the rod part is rotated by the honing mill's rotating spindle. The rod part is coaxially arranged with the honing mill's rotating spindle. The honing head clamp is held on the rod part.

[0007] One end of the transmission rod is mounted on the transmission mechanism, and the transmission rod is arranged parallel to the rod body part. The honing gantry is fixed on the transmission rod and clamps on both sides of the honing head fixture. The honing head fixture is moved along the rod body part for processing via the transmission rod and the honing gantry.

[0008] Preferably, the honing gantry is provided with a first clamping plate and a second clamping plate parallel to each other on the side near the rod part;

[0009] The honing head clamp is held between the first clamping plate and the second clamping plate;

[0010] The first clamping plate and the second clamping plate are respectively provided with through holes on the same axis; the rod part is arranged to pass through the through holes of the first clamping plate and the second clamping plate in sequence.

[0011] Preferably, the honing head chuck includes an upper clamping plate and a lower clamping plate.

[0012] One end of the upper clamping plate and the lower clamping plate of the tool holder are provided with a pressure adjustment component, and the other end is a clamping end;

[0013] The upper clamping plate of the tool holder is provided with a honing stone on the clamping side at the clamping end; the lower clamping plate of the tool holder is provided with a honing guide shoe on the clamping side at the clamping end; the rod part is clamped between the honing stone and the honing guide shoe, and is used to process the surface of the rod part by the honing stone.

[0014] Furthermore, a dial indicator is provided at one end of the upper and lower clamping plates of the tool holder near the pressure regulating assembly; this is used to detect the machining dimensions of the rod parts using the dial indicator.

[0015] Furthermore, the dial indicator is equipped with a drive rod, which abuts against the lower clamping plate of the tool holder via the upper clamping plate of the tool holder. One end of the drive rod abuts against the lower clamping plate of the tool holder, and the other end abuts against the detection end of the dial indicator, so that the dial indicator can read the machining dimensions of the rod part.

[0016] Furthermore, the pressure regulating assembly includes a pressure spring column; one end of the pressure spring column is mounted on the upper clamping plate of the tool holder, and the other end is mounted on the lower clamping plate of the tool holder. The pressure spring column is equipped with a pressure adjusting knob for adjusting the pressure.

[0017] Furthermore, a first fastening knob is provided on the clamping end of the tool holder upper clamp, and the first fastening knob is connected to the honing oilstone through the tool holder upper clamp.

[0018] Furthermore, a second fastening knob is provided on the lower clamping plate of the tool holder near the clamping end, and the second fastening knob is connected to the honing guide shoe through the lower clamping plate of the tool holder.

[0019] Furthermore, a connecting piece is provided between the upper clamping plate and the lower clamping plate of the tool holder.

[0020] Secondly, a method for machining an external cylindrical honing head, based on the aforementioned external cylindrical honing head machining system, includes the following processes:

[0021] Clamp the rod part on the rotating spindle of the honing machine and adjust the rotational runout of the rod part;

[0022] Clamp the honing head fixture on the outer circle of the rod part, adjust the pressure regulating component, adjust the micrometer clamping position so that it can read effectively, clamp the honing gantry on the honing head fixture, and start the transmission mechanism.

[0023] The transmission mechanism drives the transmission rod to reciprocate. The transmission rod pushes the honing head fixture through the honing gantry, causing the honing head fixture to reciprocate on the outer circle of the rotating rod part. After the dial indicator reading returns to zero, it represents the machining dimension of the rod part.

[0024] Compared with the prior art, the present invention has the following beneficial technical effects:

[0025] This invention provides an external cylindrical honing head machining system. A honing machine's rotating spindle is mounted on the honing machine. One end of a rod-shaped part is fixed to the honing machine's rotating spindle, and the rod-shaped part rotates via the honing machine's rotating spindle. The rod-shaped part and the honing machine's rotating spindle are coaxially arranged. A honing head fixture is clamped onto the rod-shaped part. One end of a transmission rod is mounted on a transmission mechanism, and the transmission rod is parallel to the rod-shaped part. A honing gantry is fixed to the transmission rod and clamps both sides of the honing head fixture. The honing head fixture moves along the rod-shaped part for machining via the transmission rod and the honing gantry. This invention, by machining the rod-shaped part using a honing head fixture, ensures stable external cylindrical dimensional accuracy of the rod-shaped part, improves machining efficiency, and significantly reduces the machining difficulty and labor intensity for operators.

[0026] Furthermore, a first clamping plate and a second clamping plate are respectively arranged parallel to each other on the side of the honing gantry near the rod part; the honing head fixture is clamped between the first clamping plate and the second clamping plate; the first clamping plate and the second clamping plate are respectively provided with through holes on the same axis; the rod part is arranged to pass through the through holes of the first clamping plate and the second clamping plate in sequence. The first clamping plate and the second clamping plate provide stable support for the honing head fixture, reducing vibration and deviation during the processing, thereby improving the processing accuracy. By arranging the rod part to pass through the through holes of the first clamping plate and the second clamping plate in sequence, it can be ensured that the position of the rod part remains fixed during the processing, avoiding processing errors caused by movement or displacement.

[0027] Furthermore, the honing head fixture includes an upper tool holder clamp and a lower tool holder clamp; one end of each clamp is equipped with a pressure adjustment component, and the other end is a clamping end; a honing stone is provided on the clamping side of the upper tool holder clamp at the clamping end; a honing guide shoe is provided on the clamping side of the lower tool holder clamp at the clamping end; the rod part is clamped between the honing stone and the honing guide shoe, and is used to machine the surface of the rod part by means of the honing stone; the upper and lower tool holder clamps the rod part stably through its clamping end, ensuring stability and accuracy during the machining process. The honing stone and honing guide shoe make the machining process more precise, enabling high-precision honing of the surface of the rod part. The combined use of the honing stone and honing guide shoe makes the machining process more efficient. Honing stones can quickly remove excess material from the surface of rod parts, while honing guide shoes can guide the honing stone to perform uniform honing, thereby improving processing efficiency.

[0028] Furthermore, a dial indicator is provided at one end of the upper and lower clamping plates of the tool holder near the pressure adjustment assembly; this dial indicator is used to detect the machining dimensions of the rod parts. By using the dial indicator on the upper and lower clamping plates of the tool holder, the machining dimensions of the rod parts can be measured in real time and accurately, ensuring that the machining accuracy meets the requirements.

[0029] Furthermore, the pressure regulating assembly includes a pressure spring column; one end of the pressure spring column is mounted on the upper clamping plate of the tool holder, and the other end is mounted on the lower clamping plate of the tool holder. The pressure spring column is equipped with a pressure adjustment knob for adjusting the pressure. The design of the pressure spring column allows the operator to precisely adjust the pressure of the fixture on the rod-shaped part using the pressure adjustment knob. This precise pressure control helps ensure stability and consistency during the machining process, thereby improving machining accuracy.

[0030] This invention also provides a method for machining an external cylindrical honing head. By precisely clamping the rod-shaped part onto the rotating spindle of the honing machine and adjusting the rotational runout, stability and accuracy during the machining process are ensured. The honing head fixture is held on the outer diameter of the rod-shaped part and precisely adjusted by a pressure regulating component, further improving machining accuracy. The dial indicator allows the operator to monitor the machining dimensions in real time and accurately, ensuring that the machining results meet design requirements. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the external cylindrical honing head machining system in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the external cylindrical honing head fixture structure in an embodiment of the present invention;

[0033] In the diagram: 1. Honing machine rotating spindle; 2. Honing head clamp; 3. Transmission rod; 4. Honing gantry; 5. Rod body parts; 21. Upper clamping plate of the tool holder; 22. Lower clamping plate of the tool holder; 23. Connecting piece; 24. Dial indicator; 25. Drive rod; 26. First fastening knob; 27. Honing oilstone; 28. Second fastening knob; 29. ​​Honing guide shoe; 210. Pressure adjustment assembly; 211. Pressure adjustment knob; 212. Pressure spring column; 41. First clamping plate; 42. Second clamping plate. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0035] The present invention will now be described in further detail with reference to the accompanying drawings:

[0036] The purpose of this invention is to provide an external cylindrical honing head processing system and method to solve the technical problems of low grinding quality, unstable quality and difficulty in controlling cleanliness of special structural parts that cannot be machined on a grinding machine due to the lack of center holes.

[0037] See Figure 1 In one embodiment of the present invention, an external cylindrical honing head processing system is provided, including a honing machine rotating spindle 1, a honing head fixture 2, a transmission rod 3, a honing gantry 4, and a rod body part 5;

[0038] The honing machine rotating spindle 1 is mounted on the honing machine. One end of the rod part 5 is fixed on the honing machine rotating spindle 1 and drives the rod part 5 to rotate through the honing machine rotating spindle 1. The rod part 5 is coaxially arranged with the honing machine rotating spindle 1. The honing head clamp 2 is clamped on the rod part 5.

[0039] One end of the transmission rod 3 is mounted on the transmission mechanism, and the transmission rod 3 is arranged parallel to the rod body part 5. The honing gantry 4 is fixed on the transmission rod 3. The honing gantry 4 is clamped on both sides of the honing head fixture 2, and the honing head fixture 2 is moved along the rod body part 5 for processing via the transmission rod 3 and the honing gantry 4.

[0040] Specifically, the honing gantry 4 has a first clamping plate 41 and a second clamping plate 42 arranged parallel to each other on the side near the rod part 5; the honing head clamp 2 is clamped between the first clamping plate 41 and the second clamping plate 42; the first clamping plate 41 and the second clamping plate 42 are respectively provided with through holes on the same axis; the rod part 5 is arranged to pass through the through holes of the first clamping plate 41 and the second clamping plate 42 in sequence.

[0041] Specifically, according to Figure 2 As shown, the honing head chuck 2 includes an upper tool holder 21 and a lower tool holder 22; one end of the upper tool holder 21 and the lower tool holder 22 is provided with a pressure adjustment assembly 210, and the other end is a clamping end; the upper tool holder 21 is provided with a honing stone 27 on the clamping side of the clamping end; the lower tool holder 22 is provided with a honing guide shoe 29 on the clamping side of the clamping end; the rod part 5 is clamped between the honing stone 27 and the honing guide shoe 29, and is used to process the surface of the rod part 5 by the honing stone 27; a connecting member 23 is also provided between the upper tool holder 21 and the lower tool holder 22.

[0042] Among them, the upper clamping plate 21 and the lower clamping plate 22 of the tool holder are equipped with a dial indicator 24 at one end near the pressure adjustment assembly 210; the dial indicator 24 is used to detect the machining dimensions of the rod part 5.

[0043] The dial indicator 24 is equipped with a drive rod 25, which abuts against the lower clamping plate 22 of the tool holder via the upper clamping plate 21 of the tool holder. One end of the drive rod 25 abuts against the lower clamping plate 22 of the tool holder, and the other end abuts against the detection end of the dial indicator 24, so that the dial indicator 24 can read the machining dimensions of the rod part 5.

[0044] Specifically, the pressure regulating assembly 210 includes a pressure spring column 212; one end of the pressure spring column 212 is set on the upper clamping plate 21 of the tool holder, and the other end is set on the lower clamping plate 22 of the tool holder. The pressure spring column 212 is provided with a pressure adjusting knob 211 for adjusting the pressure.

[0045] The tool holder upper clamping plate 21 is provided with a first fastening knob 26 near the clamping end, and the first fastening knob 26 is connected to the honing oilstone 27 through the tool holder upper clamping plate 21.

[0046] The tool holder lower clamping plate 22 is provided with a second fastening knob 28 near the clamping end, and the second fastening knob 28 is connected to the honing guide shoe 29 through the tool holder lower clamping plate 22.

[0047] In this embodiment, the honing head fixture 2 can be used on a regular horizontal honing machine to achieve honing of the outer diameter of the part, ensuring the machining accuracy and roughness of the part, greatly reducing the labor intensity of the operator, and significantly improving the machining efficiency of the part.

[0048] In this embodiment, the upper clamping plate 21 and the lower clamping plate 22 of the tool holder are made of stainless steel, and the honing stone 27 is made of cubic boron nitride / silicon carbide / diamond; the honing guide shoe 29 is made of copper or quenched steel or other materials of appropriate hardness depending on the material of the part.

[0049] In this embodiment, the honing pressure can be adjusted by the pressure adjustment knob 211. By clamping the rod part 5 on the honing machine, the honing process of this type of structural part can be realized using this special device.

[0050] The principle in this embodiment is as follows:

[0051] First, precisely install the rod part 5 on the rotating spindle of the honing machine and adjust its rotational runout to ensure stability and accuracy during the machining process.

[0052] Next, the honing head fixture 2 is clamped between the first clamping plate 41 and the second clamping plate 42. By adjusting the clamping force of the fixture, it can be ensured that the honing head is in close contact with the outer circle of the rod part 5.

[0053] Meanwhile, the coaxial through holes on the first clamping plate 41 and the second clamping plate 42 allow the rod part 5 to pass through them, so that the honing head can perform machining on the outer circle of the rod part.

[0054] When the transmission mechanism is started, it drives the transmission rod 3 to reciprocate. The transmission rod 3 pushes the honing head clamp 2 through the honing gantry 4, causing it to reciprocate on the outer circle of the rotating rod part 5.

[0055] During this process, the honing stone and honing guide shoe on the honing head fixture 2 will perform precise honing on the surface of the rod part.

[0056] During the machining process, the dial indicator 24 will monitor the machining dimensions of the rod part 5 in real time.

[0057] The operator can adjust the pressure regulating component 210 based on the dial indicator reading to optimize the machining process and ensure machining accuracy. Once the dial indicator reading returns to zero, it indicates that the machining dimensions of the rod part 5 have met the design requirements.

[0058] In summary, this embodiment provides an external cylindrical honing head machining system. A honing machine spindle is mounted on the honing machine, and one end of a rod-shaped part is fixed to the honing machine spindle. The spindle drives the rod-shaped part to rotate, and the rod-shaped part is coaxial with the honing machine spindle. A honing head fixture is held on the rod-shaped part, and one end of a transmission rod is mounted on a transmission mechanism, with the transmission rod parallel to the rod-shaped part. A honing gantry is fixed to the transmission rod and clamps both sides of the honing head fixture. The transmission rod, via the honing gantry, drives the honing head fixture to move along the rod-shaped part for machining. This invention, by machining the rod-shaped part using a honing head fixture, ensures stable external cylindrical dimensional accuracy, improves machining efficiency, and significantly reduces the machining difficulty and labor intensity for operators.

[0059] Example 2

[0060] This embodiment also provides a method for machining an external cylindrical honing head, based on the external cylindrical honing head machining system described above, including the following process:

[0061] Mount the rod part 5 onto the rotating spindle 1 of the honing machine and adjust the rotational runout of the rod part 5.

[0062] Clamp the honing head chuck 2 on the outer circle of the rod part 5, adjust the pressure regulating component 210, adjust the clamping position of the dial indicator 24 so that it can read effectively, and clamp the honing gantry 4 on the honing head chuck 2, and start the transmission mechanism.

[0063] The transmission mechanism drives the transmission rod 3 to reciprocate. The transmission rod 3 pushes the honing head clamp 2 through the honing gantry 4, so that the honing head clamp 2 reciprocates on the outer circle of the rotating rod part 5. After the reading of the dial indicator 24 returns to zero, it is the machining dimension of the rod part 5.

[0064] After determining the machining dimensions of the rod part 5, open the honing gantry 4, remove the honing head fixture 2 and the rod part 5, and clean and measure the rod part 5 for confirmation.

[0065] This invention replaces manual grinding with honing, increasing processing efficiency by 100%, freeing up hands, ensuring safe and convenient processing, good dimensional stability, and eliminating the need for repeated refining after a single pass. The processing cost is only 1 / 10 of that of manual grinding, and a single honing stone (27mm) can process thousands of parts. Processed parts are easy to clean, with no residue of polishing paste, metal shavings, or other contaminants, ensuring excellent cleanliness control.

[0066] This invention allows for the replacement of honing stones 27 and honing guide shoes 29 for parts of different sizes. The lengths of the selected honing stones 27 and honing guide shoes 29 can be obtained by multiplying the length of the part to be machined by 0.8. The lengths of the honing stones 27 and honing guide shoes 29 are the same. When machining parts with high material hardness, diamond oilstones or cubic boron nitride oilstones can be used, and hardened steel guide shoes can be used. When machining parts with low hardness, cubic boron nitride or silicon carbide oilstones can be used, and copper guide shoes can be used.

[0067] When machining parts, the machine speed is adjusted according to the outer diameter of the part. When the part diameter d is (3~6) mm, the speed can be adjusted to (1300~1600) r / min; when the part diameter d is (6~10) mm, the speed can be adjusted to (1000~1400) r / min; when the part diameter d is (10~18) mm, the speed can be adjusted to (800~1000) r / min; when the part diameter d is >18 mm, the speed can be adjusted to <800 r / min.

[0068] The stroke and position adjustment of the honing gantry 3 are first determined by multiplying the length of the part being processed by 0.95, and then the stopping position of the honing gantry 3 is determined according to the clamping position of the part. When the honing head chuck 2 moves to both ends of the part, the length of the exposed part of the honing head should be equal.

[0069] In summary, the external cylindrical honing head machining method provided in this embodiment ensures stability and accuracy during machining by precisely clamping the rod-shaped part onto the rotating spindle of the honing machine and adjusting the rotational runout. The honing head fixture is held on the outer diameter of the rod-shaped part and precisely adjusted by the pressure regulating component, further improving machining accuracy. The dial indicator allows the operator to monitor the machining dimensions accurately in real time, ensuring that the machining results meet design requirements.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A honing head machining system, characterized in that, It includes a honing machine rotating spindle (1), a honing head clamp (2), a transmission rod (3), a honing gantry (4), and rod body parts (5); The honing machine rotating spindle (1) is mounted on the honing machine. One end of the rod part (5) is fixed on the honing machine rotating spindle (1) and the rod part (5) is driven to rotate by the honing machine rotating spindle (1). The rod part (5) is coaxially arranged with the honing machine rotating spindle (1). The honing head clamp (2) is clamped on the rod part (5). One end of the transmission rod (3) is mounted on the transmission mechanism, and the transmission rod (3) is arranged parallel to the rod body part (5). The honing gantry (4) is fixed on the transmission rod (3). The honing gantry (4) is clamped on both sides of the honing head fixture (2), and the honing head fixture (2) is moved along the rod body part (5) for processing via the transmission rod (3) and the honing gantry (4). The honing gantry (4) has a first clamping plate (41) and a second clamping plate (42) respectively arranged parallel to each other on the side near the rod part (5). The honing head clamp (2) is held between the first clamping plate (41) and the second clamping plate (42); The first clamping plate (41) and the second clamping plate (42) are respectively provided with through holes on the same axis; the rod part (5) is arranged to pass through the through holes of the first clamping plate (41) and the second clamping plate (42) in sequence; The honing head clamp (2) includes an upper clamping plate (21) and a lower clamping plate (22). One end of the upper clamping plate (21) and the lower clamping plate (22) of the tool holder is provided with a pressure adjustment component (210), and the other end is a clamping end; The upper clamping plate (21) of the tool holder is provided with a honing stone (27) at the clamping side of the clamping end; the lower clamping plate (22) of the tool holder is provided with a honing guide shoe (29) at the clamping side of the clamping end; the rod part (5) is clamped between the honing stone (27) and the honing guide shoe (29) for processing the surface of the rod part (5) by the honing stone (27); The upper clamping plate (21) and the lower clamping plate (22) of the tool holder are equipped with a dial indicator (24) at one end near the pressure regulating assembly (210); the dial indicator (24) is used to detect the machining dimensions of the rod part (5); The dial indicator (24) is provided with a drive rod (25). The drive rod (25) abuts against the lower clamping plate (22) of the tool holder through the upper clamping plate (21) of the tool holder. One end of the drive rod (25) abuts against the lower clamping plate (22) of the tool holder, and the other end abuts against the detection end of the dial indicator (24). The dial indicator (24) reads the machining dimensions of the rod part (5). The pressure regulating assembly (210) includes a pressure spring column (212); one end of the pressure spring column (212) is set on the upper clamping plate (21) of the tool holder, and the other end is set on the lower clamping plate (22) of the tool holder. The pressure spring column (212) is provided with a pressure adjustment knob (211) for adjusting the pressure.

2. The external cylindrical honing head machining system according to claim 1, characterized in that, The tool holder upper clamping plate (21) is provided with a first fastening knob (26) near the clamping end. The first fastening knob (26) is connected to the honing oilstone (27) through the tool holder upper clamping plate (21).

3. The external cylindrical honing head machining system according to claim 1, characterized in that, The tool holder lower clamping plate (22) is provided with a second fastening knob (28) near the clamping end. The second fastening knob (28) is connected to the honing guide shoe (29) through the tool holder lower clamping plate (22).

4. The external cylindrical honing head machining system according to claim 1, characterized in that, A connector (23) is also provided between the upper clamping plate (21) and the lower clamping plate (22) of the tool holder.

5. A method for machining an external cylindrical honing head, characterized in that, An external cylindrical honing head machining system according to any one of claims 1-4 includes the following process: The rod part (5) is clamped on the rotating spindle (1) of the honing machine, and the rotational runout of the rod part (5) is adjusted. Clamp the honing head fixture (2) on the outer circle of the rod part (5), adjust the pressure adjustment component (210), adjust the clamping position of the dial indicator (24) so ​​that it can read effectively, and clamp the honing gantry (4) on the honing head fixture (2) and start the transmission mechanism. The transmission mechanism drives the transmission rod (3) to reciprocate. The transmission rod (3) pushes the honing head clamp (2) through the honing gantry (4), so that the honing head clamp (2) reciprocates on the outer circle of the rotating rod part (5). After the reading of the dial indicator (24) returns to zero, it is the processing dimension of the rod part (5).

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