A tool setting instrument for CNC lathe

Abstract

The present invention relates to the field of tool setting measurement technology for CNC machine tools, and in particular to a tool setting instrument for CNC lathes, comprising: a fixed handle, a rotating shaft, a swing arm and a contactor, and the fixed handle, the rotating shaft and the swing arm are all made of conductive metal materials. The rotating shaft is installed in the fixed handle, the swing arm is installed on the rotating shaft, the contactor is installed on the swing arm, and the rotating shaft can adjust its angle relative to the fixed handle, and the swing arm can adjust its angle relative to the rotating shaft, so as to achieve tool setting under different spatial position relationships. The tool setting instrument of the present invention is installed on the tailstock of the machine tool, which is convenient for installation and disassembly, and is suitable for use on most machine tools; in addition, by adjusting the structural form of the tool setting instrument, the tool height and the origin of the workpiece coordinate system can be set, and it has a more comprehensive tool setting function, and uses the closed loop principle, so the tool setting is accurate.

Description

Technical Field

[0001] The invention relates to the technical field of tool setting measurement for numerically controlled machine tools, and in particular to a tool setting instrument for numerically controlled lathes. Background Art

[0002] The information disclosed in the background of the invention is only intended to enhance the understanding of the overall background of the invention and should not be necessarily regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] With the development of mechanical processing technology, the operation requirements of CNC lathes are becoming more and more intelligent and simplified. However, when installing tools on CNC lathes, it is difficult to accurately measure the installation height, and trial cutting is required to accurately determine it. Setting the X-axis coordinate origin also requires turning the workpiece and measuring the size to accurately set it, which is relatively cumbersome. Especially when using multiple tools at the same time, it brings inconvenience to the operator. The Z-axis origin is relatively simple, but it also requires the tool to touch the workpiece. Some of the current tool setting devices or instruments are relatively expensive and have high requirements for certain performance of the machine tool. Ordinary CNC lathes are difficult to meet the requirements. Although some tool setting tools are relatively simple and convenient, their functions are relatively single, and it is difficult to simultaneously meet the problems of determining the tool height and setting the X-axis workpiece coordinate system origin and the Z-axis origin. Summary of the invention

[0004] In view of the above problems, the present invention provides a tool setting instrument for a CNC lathe, which can conveniently and accurately set the tool height and the origin of the workpiece coordinate system. To achieve the above objectives, the technical solution of the present invention is as follows.

[0005] A tool setting instrument for a numerically controlled lathe comprises a fixed handle, a rotating shaft, a swing arm and a contactor, wherein the fixed handle, the rotating shaft and the swing arm are all made of conductive metal materials.

[0006] A fixing shaft hole is arranged at the first end of the fixing handle, and a first straight hole and a countersunk bolt hole communicating with the fixing shaft hole are opened on the side wall of the first end.

[0007] The first end of the rotating shaft is provided with two groups of mutually perpendicular second straight holes along its circumference, and an annular groove is provided at a position adjacent to the second straight holes. The first end of the rotating shaft is installed in the fixed shaft hole, and the bolt fixing shaft passes through the countersunk bolt hole and enters the annular groove, and the fixing pin passes through the first straight hole and the second straight hole to fix the first end of the rotating shaft in the fixed shaft hole.

[0008] The second end of the rotating shaft is provided with an open slot, and the open slot is provided with a group of countersunk holes and two groups of third straight holes, and the axes of the countersunk holes, the third straight holes, and one group of the second straight holes are parallel to each other. The connecting line formed by sequentially connecting the centers of the first group of third straight holes, the countersunk holes, and the second group of third straight holes is a right triangle, and the countersunk holes are located at the right angle.

[0009] The swing arm is an "L"-shaped structure, and its first end is provided with two groups of fourth straight holes that respectively cooperate with the countersunk hole and the third straight hole, and the second end of the swing arm is provided with a screw hole, wherein the first end of the swing arm is installed in the open groove, and the bolt fixing shaft passes through the countersunk hole and a group of fourth straight holes, and the first end of the swing arm is fixed in the open groove after the fixing pin passes through the third straight hole and the fourth straight hole.

[0010] The contactor is installed in the screw hole. After the CNC lathe tool setting instrument is installed on the machine tool and the contactor contacts with the tool to form a closed loop, the light source of the contactor can emit light.

[0011] Furthermore, the fixing handle is a Morse taper handle, and a fan tail is arranged at the first end thereof, that is, the fan tail is arranged at the end of the Morse taper handle with a smaller diameter, and the fixing shaft hole is arranged at the end of the Morse taper handle with a larger diameter.

[0012] Furthermore, the contactor includes: a metal shell, a power supply, a metal end cover, a transparent insulating shell, a light source, a contact shell, and a contact. The metal shell is a structure with an inner cavity and openings at both ends, the power supply is installed in the inner cavity of the metal shell, the metal end cover is installed in an opening at one end of the metal shell, and the metal end cover is connected to the positive / negative pole of the power supply. The transparent insulating shell is installed on the other end opening of the metal shell, the light source is installed in the inner cavity of the transparent insulating shell, and the light source is connected to the negative / positive pole of the power supply. The contact shell is installed at the other end of the transparent insulating shell, the contact is installed in the inner cavity of the contact shell, and one end of the contact extends to the outside of the contact shell, and the other end of the contact is connected to the light source. The outer surface of the metal shell is screwed to the screw hole, so as to fix the contactor on the swing arm.

[0013] Furthermore, the contactor also includes an insulating fixing plate and a first spring, the insulating fixing plate is a bolt-shaped ("T"-shaped) structure with a cavity, and the cavity passes through the head and screw of the bolt-shaped structure, and in addition, the head is provided with a first groove connected to the cavity, a first spring is arranged in the first groove, the current input end of the light source is installed in the cavity, and the current input end is connected to the power supply through the first spring.

[0014] Furthermore, a second groove is formed at the other end of the transparent insulating shell, a second spring is arranged in the second groove, and the contact is connected to the current output end of the light source through the second spring.

[0015] Furthermore, the contact is a bolt-shaped structure, which is composed of a head and a screw connected together. The head is located in the inner cavity of the contact housing, and the screw extends to the outside of the contact housing after passing through the contact housing. The contact can reciprocate in the contact housing under the cooperation of external force and the second spring.

[0016] Furthermore, the metal end cover and the metal shell are screwed together, the metal shell and the transparent insulating shell are screwed together, and the transparent insulating shell and the contact shell are screwed together.

[0017] Furthermore, the outer surface of the metal shell has external threads to facilitate connection with the screw holes.

[0018] Furthermore, the power source is a button battery, and the light source is a light emitting diode.

[0019] Compared with the prior art, the present invention has the following beneficial effects: the tool setting instrument of the present invention is installed on the tailstock of the machine tool, which is convenient for installation and disassembly and is suitable for use on most machine tools; in addition, by adjusting the structural form of the tool setting instrument, the tool height and the origin of the workpiece coordinate system can be set, which has a more comprehensive tool setting function, and uses the closed loop principle, so the tool setting is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0021] Figure 1 It is a schematic diagram of the structure of the tool setting instrument for a CNC lathe in an embodiment of the present invention.

[0022] Figure 2 Schematic diagram of the structure of the fixed handle in an embodiment of the present invention.

[0023] Figure 3 Schematic diagram of the structure of the rotating shaft in an embodiment of the present invention.

[0024] Figure 4 Schematic diagram of the structure of the swing arm in an embodiment of the present invention.

[0025] Figure 5 Schematic diagram of the structure of the contactor in the embodiment of the present invention.

[0026] Figure 6 Schematic diagram of the structure of the metal shell in an embodiment of the present invention.

[0027] Figure 7 Schematic diagram of the structure of a transparent insulating shell in an embodiment of the present invention.

[0028] Figure 8Schematic diagram of the structure of the contact in the embodiment of the present invention.

[0029] Fig. 9 Schematic diagram of the structure of the insulating fixing plate and the light source in an embodiment of the present invention.

[0030] Fig.10 It is a schematic diagram of the structure for determining the tool height in an embodiment of the present invention.

[0031] Fig.11 Schematic diagram of the structure for setting the origin of the X-axis coordinate system in an embodiment of the present invention.

[0032] Fig.12 Schematic diagram of the structure for setting the origin of the Z-axis coordinate system in an embodiment of the present invention.

[0033] The marks in the figure represent: 1-fixed handle, 101-fixed shaft hole, 102-first straight hole, 103-countersunk bolt hole, 104-fan tail; 2-rotating shaft, 201-second straight hole, 202-annular groove, 203-open groove, 204-countersunk hole, 205-third straight hole; 3-swing arm, 301-fourth straight hole, 302-screw hole; 4-contactor, 401-metal shell, 402-power supply, 403-metal end cover, 404-transparent insulating shell, 405-light source, 406-contact shell, 407-contact, 408-insulating fixing plate, 409-first spring, 410-second spring, 4041-protrusion, 4081-first groove, 5-bolt fixing shaft, 6-nut, 7-tool. DETAILED DESCRIPTION

[0034] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or component needs to have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0037] Terminology explanation section: The terms "install", "connected", "connect", "fixed" and the like in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; it can be an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0038] As mentioned above, some current tool setting devices or instruments are relatively expensive and have high requirements for certain performance of machine tools, which are difficult for ordinary CNC lathes to meet. Although some tool setting tools are relatively simple and convenient, their functions are relatively single and it is difficult to simultaneously meet the problems of determining the tool height and setting the origin of the X-axis workpiece coordinate system and the Z-axis origin. Therefore, the present invention proposes a tool setting instrument for CNC lathes; the present invention is further described in conjunction with the drawings and specific embodiments of the specification.

[0039] Reference Figure 1-9 The tool setting instrument for a CNC lathe shown in the figure mainly includes the following four parts: a fixed handle 1, a rotating shaft 2, a swing arm 3 and a contactor 4. The fixed handle 1, the rotating shaft 2 and the swing arm 3 are all made of conductive metal materials, and aluminum alloy is selected in this embodiment.

[0040] First, refer to Figure 2 The fixed handle 1 is a Morse taper handle, with a fan tail 104 at the end with a smaller diameter, a fixed shaft hole 101 at the end with a larger diameter, and a first straight hole 102 and a countersunk bolt hole 103 connected to the fixed shaft hole 101 are opened on the side wall of the end with a larger diameter. When setting the tool, the Morse taper handle is installed in the Morse taper hole of the tailstock sleeve of the CNC lathe, which not only accurately locates the center, but also has self-locking function and is not easy to fall off; in addition, the fan tail 104 plays a directional role in the Morse taper hole of the tailstock sleeve.

[0041] Secondly, refer to Figure 1 and 3The rotating shaft 2 is a cylindrical rod-shaped structure, and two groups of mutually perpendicular second straight holes 201 are arranged at its first end along its circumference, and an annular groove 202 is arranged at a position adjacent to the second straight hole 201. The first end of the rotating shaft 2 is installed in the fixed shaft hole 101, and the bolt fixing shaft 5 passes through the countersunk bolt hole 102 and enters the annular groove 202, and the fixing pin 6 passes through the first straight hole 102 and the second straight hole 201 to fix the first end of the rotating shaft 2 in the fixed shaft hole 101. When it is necessary to change the position of the rotating shaft 2 in the fixed shaft hole 101, remove the bolt fixing shaft 5 and the fixing pin 6, and then rotate the rotating shaft 290°. At this time, the first straight hole 102 is aligned with the other group of second straight holes 201, and then the first end of the rotating shaft 2 is fixed in the fixed shaft hole 101 by the bolt fixing shaft 5 and the fixing pin 6 in the same way.

[0042] Further, continue to refer to Figure 1 and 3 The second end of the rotating shaft 2 is provided with an open slot 203, and the open slot 203 is provided with a group of countersunk holes 204 and two groups of third straight holes 205, and the axes of the countersunk holes 204, the third straight holes 205, and one group of the second straight holes 201 are parallel to each other. The connecting line formed by connecting the centers of the first group of third straight holes, the countersunk holes 204, and the second group of third straight holes 205 in sequence is a right triangle, and the countersunk holes 204 are located at a right angle, so that when the swing arm 3 needs to be rotated 90° relative to the open slot 203, the connection between the swing arm 3 and the open slot 203 is switched from one group of third straight holes 205 to another group of third straight holes 205, and during the switching process, the swing arm 3 can be rotated around the bolt fixing shaft 5 in the countersunk holes 204, and when it is rotated to a predetermined position, the fixing pin 6 can be inserted to fix it.

[0043] refer to Figure 4 The swing arm 3 is an "L" shaped structure, and two groups of fourth straight holes 301 are provided on the first end thereof, which are matched with the countersunk hole 204 and the third straight hole 205 respectively, and a screw hole 302 is provided on the second end of the swing arm 3, wherein the first end of the swing arm 3 is installed in the open slot 203, and the first end of the swing arm 3 is fixed in the open slot 203 after the bolt fixing shaft 5 passes through the countersunk hole 204 and a group of fourth straight holes 301, and the fixing pin 6 passes through the third straight hole 205 and the fourth straight hole 301. One of the functions of the swing arm 3 is to change the angle relative to the rotating shaft 2, so as to realize the tool setting under different spatial position relationships (refer to Figure 10-12 ).

[0044] refer to Figure 1 and 4 , the contactor 4 is installed in the screw hole 302, and after the CNC lathe tool setting instrument is installed on the machine tool and the contactor 4 contacts the tool to form a closed circuit, the light source of the contactor 4 can emit light. Specifically, refer to Figure 5The contactor 4 includes: a metal shell 401, a power source 402, a metal end cover 403, a transparent insulating shell 404, a light source 405, a contact shell 406, and a contact 407. Among them:

[0045] refer to Figure 6 The metal shell 401 is a structure with an inner cavity and openings at both ends, wherein an internal thread is provided in the opening, and an external thread is provided on the outer surface of the metal shell 401, and the contactor 4 is fixed on the swing arm 3 by the cooperation of the external thread and the screw hole 302. In addition, nuts 6 are assembled on the contactor 4, and the screw hole 302 is sandwiched between the two nuts 6, so as to increase the stability of the contactor 4 on the swing arm 3.

[0046] Furthermore, the power source 402 (button battery) is installed in the inner cavity of the metal shell 401, and the metal end cover 403 is a bolt-shaped structure (composed of a head and a screw), the screw portion of which is screwed together with the opening at one end of the metal shell 401, and the screw extends all the way into the inner cavity of the metal shell 401 and contacts the negative pole of the power source 402; the head of the metal end cover 403 is located outside the metal shell 401. One of the functions of the metal end cover 403 is to achieve electrical conduction between the power source and the metal shell, so that a current path can be formed when aligning the tool. Another important function of the metal end cover 403 is to fix the power source 402 in the metal shell and provide support for the power source when the power source is squeezed.

[0047] Continue to refer Figure 5 , the transparent insulating shell 404 is installed on the other end opening of the metal shell 401. Specifically, the transparent insulating shell 404 is a cylinder (transparent plastic) with the same diameter as the metal shell 401, and has two cylindrical protrusions 4041 at both ends. The surface of the protrusion 4041 is provided with an external thread that can cooperate with the internal thread in the opening of the metal shell 401, so that the transparent insulating shell 404 and the metal shell 401 are fixed together, and the inner cavity of the transparent insulating shell 404 is connected to the inner cavity of the transparent insulating shell 404.

[0048] The light source 405 (light emitting diode) is installed in the inner cavity of the transparent insulating shell 404, and the light source 405 is connected to the positive electrode of the power supply 402. The contact housing 406 is installed on the protrusion 4041 at the other end of the transparent insulating shell 404 and is screwed together. The contact 407 is installed in the inner cavity of the contact housing 406 and one end of the contact 407 extends to the outside of the contact housing 406, and the other end of the contact 407 is connected to the light source 405. Specifically, refer to Figure 8 The contact 407 is a bolt-shaped structure, which is composed of a head and a screw connected together. The head is located in the inner cavity of the contact housing 406, and the screw passes through the contact housing 406 and extends to the outside of the contact housing 406.

[0049] Further, refer to Figure 5 and 9 In some other embodiments, the contactor 4 further includes an insulating fixing plate 408 and a first spring 409. The insulating fixing plate 408 is a bolt-shaped ("T"-shaped) structure having a cavity, and the cavity penetrates the head and the screw of the bolt-shaped structure. In addition, the head is provided with a first groove 4081 communicating with the cavity, and a first spring 409 is arranged in the first groove. The current input end of the light source 405 is installed in the cavity, and the current input end is connected to the power source 402 through the first spring 409. The other end of the transparent insulating shell 404 is provided with a second groove, and a second spring 410 is arranged in the second groove. One end of the contact 407 is provided with a third groove, and the two ends of the second spring 410 are respectively installed in the second groove and the third groove. The second spring 410 is connected to the light source and the two can form a current path. During tool setting, the contact 407 can move into the contact housing 406 under the cooperation of external force and the second spring 410, and return to the original position when the external force is removed, thereby achieving close contact between the tool and the contact and preventing circuit breakage during tool setting.

[0050] Further, refer to Fig.10 (fixed handle 1 omitted), which is a schematic diagram for determining the tool height state. At this time, the tool 7 is parallel to the horizontal plane, and the fixed handle 1 is installed in the tapered hole of the machine tool tailstock sleeve, and the countersunk bolt hole 103 of the fixed handle 1 is vertically facing upward. The countersunk hole 204 and the third straight hole 205 on the opening slot 202 are parallel to the horizontal plane, and the lower end face of the contact 407 of the contactor 4 is vertically facing downward. If the contact contacts the top of the tool tip, at this time, the tool setting instrument and various parts of the machine tool form a closed loop. When the light-emitting diode is observed to be on from the transparent insulating tube 404, the tool height meets the requirements.

[0051] Further, based on the previous step, refer to Fig.11 (fixed handle 1 omitted), which is a schematic diagram of the structure for setting the origin of the X-axis coordinate system. At this time, the tool 7 is still parallel to the horizontal plane. The rotating shaft 2 is rotated 90° relative to the fixed handle 1, so that the central axis of the contact 407 of the contactor coincides with the tool 7, that is, the contactor is parallel to the horizontal plane. The tip of the tool is close to the end face of the contact 407. When the light-emitting diode is observed to be on from the transparent insulating tube 404, it means that the tip of the tool and the end face of the contact 407 are in contact, that is, the tip of the tool is at the origin of the X-axis coordinate system. At this time, the origin of the X-axis coordinate system can be directly set.

[0052] Further, based on the previous step, refer to Fig.12(fixed handle 1 is omitted), which is a schematic diagram of the structure for setting the origin of the z-axis coordinate system. At this time, the tool 7 is still parallel to the horizontal plane, and the contactor is also parallel to the horizontal plane. The swing arm 3 is rotated 90° relative to the annular groove 202, so that the central axis of the contactor 407 is perpendicular to the length direction of the tool 7 (or the central axis of the contactor 407 is perpendicular to the axis of the tool rod), the tip of the tool 7 lightly touches the contactor contact 407), and when the light-emitting diode is observed to be on from the transparent insulating tube 404, the z-axis zero point can be set.

[0053] Finally, it should be noted that any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. Although the above describes the specific implementation of the present invention in conjunction with the drawings, it is not a limitation of the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the present invention.

Claims

1. A tool setting instrument for a CNC lathe, characterized in that: include: A fixed handle, a rotating shaft, a swing arm and a contactor, wherein the fixed handle, the rotating shaft and the swing arm are all made of conductive metal materials; wherein: A fixing shaft hole is arranged at the first end of the fixing handle, and a first straight hole and a countersunk bolt hole communicating with the fixing shaft hole are arranged on the side wall of the first end; The first end of the rotating shaft is provided with two groups of mutually perpendicular second straight holes along its circumference, and an annular groove is provided at a position adjacent to the second straight holes. The first end of the rotating shaft is installed in the fixed shaft hole, and the bolt fixing shaft passes through the countersunk bolt hole and enters the annular groove, and the fixing pin passes through the first straight hole and the second straight hole to fix the first end of the rotating shaft in the fixed shaft hole; The second end of the rotating shaft is provided with an open slot, and a group of countersunk holes and two groups of third straight holes are provided on the open slot, and the axes of the countersunk holes, the third straight holes, and one group of the second straight holes are parallel to each other; the connecting line formed by sequentially connecting the centers of the first group of third straight holes, the countersunk holes, and the second group of third straight holes is a right triangle, and the countersunk holes are located at the right angle; The swing arm is an "L"-shaped structure, and two groups of fourth straight holes are respectively provided on the first end thereof, which are matched with the countersunk hole and the third straight hole, and a screw hole is provided on the second end of the swing arm, wherein the first end of the swing arm is installed in the open slot, and a bolt fixing shaft passes through the countersunk hole and a group of fourth straight holes, and a fixing pin passes through the third straight hole and the fourth straight hole to fix the first end of the swing arm in the open slot; The contactor is installed in the screw hole, and after the CNC lathe tool setting instrument is installed on the machine tool and the contactor contacts with the tool to form a closed loop, the light source of the contactor can emit light; The fixed handle is a Morse taper handle, and a fan tail is arranged at the first end thereof, that is, the fan tail is arranged at the end of the Morse taper handle with a smaller diameter, and the fixed shaft hole is arranged at the end of the Morse taper handle with a larger diameter; The contactor comprises: a metal shell, a power source, a metal end cover, a transparent insulating shell, a light source, a contact shell, and a contact; wherein the metal shell is a structure having an inner cavity and openings at both ends, the power source is installed in the inner cavity of the metal shell, the metal end cover is installed in an opening at one end of the metal shell, and the metal end cover is connected to the positive / negative pole of the power source; the transparent insulating shell is installed on the other end opening of the metal shell, the light source is installed in the inner cavity of the transparent insulating shell, and the light source is connected to the negative / positive pole of the power source; the contact shell is installed at the other end of the transparent insulating shell, the contact is installed in the inner cavity of the contact shell, and one end of the contact extends to the outside of the contact shell, the other end of the contact is connected to the light source, and the outer surface of the metal shell is screwed to the screw hole; The contactor further comprises an insulating fixing plate and a first spring, wherein the insulating fixing plate is a bolt-shaped structure having a cavity, and the cavity penetrates the head and the screw of the bolt-shaped structure, the head is provided with a first groove connected with the cavity, a first spring is arranged in the first groove, a current input end of the light source is installed in the cavity, and the current input end is connected to a power source through the first spring; The contact is a bolt-shaped structure, which is composed of a head and a screw connected together, the head is located in the inner cavity of the contact housing, and the screw passes through the contact housing and extends to the outside of the contact housing; The contactor also includes a second spring, a second groove is formed at the other end of the transparent insulating shell, a third groove is formed at one end of the contact, two ends of the second spring are respectively installed in the second groove and the third groove, the second spring is connected to the light source and the two can form a current path.

2. The tool setting instrument for a CNC lathe according to any one of claim 1, characterized in that: The metal end cover and the metal shell are screwed together, the metal shell and the transparent insulating shell are screwed together, and the transparent insulating shell and the contact shell are screwed together.

3. The tool setting instrument for a CNC lathe according to any one of claim 1, characterized in that: The outer surface of the metal shell is provided with external threads.

4. The tool setting instrument for a CNC lathe according to any one of claim 1, characterized in that: The power source is a button battery, and the light source is a light emitting diode.

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