CN113532215A - Conical thread gauge calibration method - Google Patents
Conical thread gauge calibration method Download PDFInfo
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- CN113532215A CN113532215A CN202110798363.4A CN202110798363A CN113532215A CN 113532215 A CN113532215 A CN 113532215A CN 202110798363 A CN202110798363 A CN 202110798363A CN 113532215 A CN113532215 A CN 113532215A
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000005259 measurement Methods 0.000 claims abstract description 35
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- 238000005299 abrasion Methods 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 8
- 239000004744 fabric Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012795 verification Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B3/00—Measuring instruments characterised by the use of mechanical techniques
- G01B3/46—Plug gauges for internal dimensions with engaging surfaces which are at a fixed distance, although they may be preadjustable
- G01B3/48—Plug gauges for internal dimensions with engaging surfaces which are at a fixed distance, although they may be preadjustable for internal screw-threads
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Abstract
The invention relates to the technical field of industry, and discloses a conical thread gauge calibration method, which comprises the following steps: s1, preparing work such as knocking out the threads from the pipes, removing burrs and cleaning is well done before measurement; s2, installing the thread between two thimbles of the universal tool microscope through two thimble holes of the conical thread plug gauge, and ensuring the consistency of the thread axis and the measuring axis; s3, adjusting the focal length of the industrial display to make the image of the measuring knife most clear, installing the measuring knife rest on a quasi-plane with a T-shaped groove in the middle of a longitudinal guide plate of the industrial display, and fixing the measuring knife on the measuring knife rest through a spring pressing plate; and S4, when the cutter is adjusted, the measuring cutter is moved horizontally left and right to contact with the tooth side, and the meter line and the measuring cutter are aligned as much as possible. According to the conical thread gauge calibration method, the base surface of the conical thread is used as the reference plane during measurement, so that certain errors caused when the measured result is finally converted into the base surface intermediate diameter due to the abrasion or deformation of the end surface and the like are prevented.
Description
Technical Field
The invention relates to the technical field of industry, in particular to a conical thread gauge calibration method.
Background
The conical thread is a connecting thread with tight connection and good air tightness, has the advantages of easy assembly and the characteristic of obtaining interference fit, and therefore, has wide application in liquid and gas pipeline systems.
The conical thread in the manufacturing process and in use usually adopts comprehensive measurement, and a conical thread plug gauge is used for detecting the conical internal thread, and a conical thread ring gauge is used for detecting the conical external thread. For a conical thread, the pitch diameter is difficult to measure compared to a cylindrical thread, since the pitch diameters are different in different sections of the conical thread.
Disclosure of Invention
The invention provides a method for calibrating a conical thread gauge, which has the beneficial effect of adopting a high-precision reference surface calibration mode and solves the problem that the measurement of the pitch diameter of the conical thread is difficult in the background technology.
The invention provides the following technical scheme: a conical thread gauge calibration method comprises the following steps:
s1, preparing work such as knocking out the threads from the pipes, removing burrs and cleaning is well done before measurement;
s2, installing the thread between two thimbles of the universal tool microscope through two thimble holes of the conical thread plug gauge, and ensuring the consistency of the thread axis and the measuring axis;
s3, adjusting the focal length of the industrial display to make the image of the measuring knife most clear, installing the measuring knife rest on a quasi-plane with a T-shaped groove in the middle of a longitudinal guide plate of the industrial display, and fixing the measuring knife on the measuring knife rest through a spring pressing plate;
s4, when the cutter is adjusted, the measuring cutter is enabled to translate left and right to be in contact with the tooth side, the cutter cannot be pushed in parallel, the measuring cutter is easy to damage or quickly wear until the cutter edge is in fit with the tooth side, and the measuring cutter is used for abutting against the base surface of the conical thread to enable the meter-shaped thread to be aligned with the cutter edge of the measuring cutter as much as possible.
As an alternative to the method of calibrating a conical thread gauge of the present invention, wherein: the base surface of the conical thread is used as a reference plane during measurement, in order to eliminate pitch diameter measurement errors caused by inclination of the thread axis and the measurement axis, the left and right tooth sides of the thread are respectively measured, the conical thread ring gauge is an internal thread, the taper cannot be independently measured by an instrument, and the inspection and acceptance of the conical thread ring gauge are based on the calibration of a thread plug gauge.
As an alternative to the method of calibrating a conical thread gauge of the present invention, wherein: the thread part of the measured thread ring gauge is cleaned by gasoline and cleaned by white poplin cloth, and the four required equal measuring blocks are cleaned and cleaned by the white poplin cloth and then placed on a workbench.
As an alternative to the method of calibrating a conical thread gauge of the present invention, wherein: the conical thread ring gauge and the plug gauge are provided with three planes with different heights, and the height difference between the reference surface of the conical thread plug gauge and the reference surface of the ring gauge is measured by a height micrometer.
As an alternative to the method of calibrating a conical thread gauge of the present invention, wherein: the measuring block is taken down from a workbench of the instrument, the calibrated thread ring gauge is clamped on the workbench, a tail pipe and a measuring head of the instrument are slid, a measuring ball on an inner measuring hook is placed in the middle of corresponding thread grooves on two sides of the thread ring gauge, a handle of the workbench is moved to find an inflection point, the detected thread ring gauge is taken down, the ground measuring block is clamped on the workbench, whether the zero point returns to zero is checked, and if the zero point X is still zero, the X value is effective.
As an alternative to the method of calibrating a conical thread gauge of the present invention, wherein: the measurement operation process comprises the following steps: adjusting the parallelism of the two measuring heads, installing a top center on a workbench, horizontally placing the measured thread gauge on the top center according to the position shown in figure 1, vertically placing a three-needle thread groove, adjusting the position of the workbench to find an inflection point in an eyepiece, adjusting the position of the workbench to the maximum value up and down, horizontally adjusting the workbench to the maximum value, and rotating the workbench left and right to the minimum value. The three values are combined into one, and then the value of M in the middle school can be read out, and the middle school value d can be obtained through conversion of the formula (1).
As an alternative to the method of calibrating a conical thread gauge of the present invention, wherein: in order to avoid the influence of the thread form error on the measurement result, the selected needle roller diameter is placed in the thread groove, the contact point of the needle roller diameter and the thread form angle is the optimal needle diameter just on the middle diameter line, and in the measurement, if the optimal needle roller cannot be found, the contact point of the needle roller diameter is generally selected.
As an alternative to the method of calibrating a conical thread gauge of the present invention, wherein: the geometric parameters of the conical thread plug gauge are recorded on the section of the thread axis along the radial direction or the axial direction, and the main parameters are as follows: the measuring method comprises the following steps of selecting a double-ball measuring needle of an instrument to measure according to the specification of a measured thread by adopting a corresponding standard according to the specification of the measured thread, and selecting a corresponding force measuring option according to the specification of a thread ring gauge.
As an alternative to the method of calibrating a conical thread gauge of the present invention, wherein: the diameter parameter of the conical thread is defined on a datum plane, and the distance between the small end face (the datum plane) and a datum plane of the conical external thread is the datum plane distance. Before the 'probe method' is adopted for measurement, a reference plane needs to be marked on a universal tool microscope, and when the position of the reference plane cannot be marked, the position nearby the reference plane can be marked. In order to locate the marking position (section) on the angular bisector of the thread groove, the conical external thread can be rotated (positioned by adopting the tip) when axial displacement does not occur, and the distance from the marking position to the base surface can be measured.
The invention has the following beneficial effects:
1. according to the conical thread gauge calibration method, the base surface of the conical thread is used as the reference plane during measurement, so that certain errors caused when the measured result is finally converted into the base surface intermediate diameter due to the abrasion or deformation of the end surface and the like are prevented.
2. According to the method for calibrating the conical thread gauge, when the deviation between the base planes of the ring gauge and the calibration gauge in use reaches or exceeds-0.37 mm, the ring gauge is scrapped, and if the deviation is smaller than the height difference, the ring gauge is qualified. Under the condition that exact data of the pitch diameter of the thread ring gauge are required to be given, the pitch diameter of the ring gauge can be calculated through the height difference and the taper of the plug gauge and the ring gauge.
Drawings
FIG. 1 is a diagram of the measurement of external conical threads of the present invention.
FIG. 2 is a geometric relationship diagram of the median diameter of the reference plane and the dimensions of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1-2, a method for calibrating a conical thread gauge includes the following steps:
s1, preparing work such as knocking out the threads from the pipes, removing burrs and cleaning is well done before measurement;
s2, installing the thread between two thimbles of the universal tool microscope through two thimble holes of the conical thread plug gauge, and ensuring the consistency of the thread axis and the measuring axis;
s3, adjusting the focal length of the industrial display to make the image of the measuring knife most clear, installing the measuring knife rest on a quasi-plane with a T-shaped groove in the middle of a longitudinal guide plate of the industrial display, and fixing the measuring knife on the measuring knife rest through a spring pressing plate;
and S4, when the cutter is adjusted, the measuring cutter is moved horizontally left and right to contact with the tooth side, and the meter line and the measuring cutter are aligned as much as possible.
In this embodiment: before measurement, preparatory work such as knocking out threads from a pipe, removing burrs, cleaning and the like is well carried out, and the threads are arranged between two thimbles of a universal tool microscope through two thimble holes of a conical thread plug gauge, so that the consistency of the thread axis and the measurement axis is ensured. And adjusting the focal length of the universal display to ensure that the image of the measuring knife is most clear. The measuring knife rest is arranged on a quasi-plane with a T-shaped groove in the middle of the industrial display longitudinal guide plate, and the measuring knife is fixed on the measuring knife rest through a spring pressing plate. When the cutter is adjusted, the measuring cutter is moved horizontally left and right to contact with the tooth side, and cannot be pushed in parallel, so that the measuring cutter is easily damaged or quickly worn until the cutter edge is in close fit with the tooth side. The measuring knife is used for leaning against the base surface of the conical thread, and the knife edge of the meter line and the knife edge of the measuring knife are aligned as much as possible. The base plane of the conical thread is used as a reference plane for measurement.
Example 2
Referring to fig. 1-2, the present embodiment is an improvement on embodiment x. A method for calibrating a conical thread gauge takes the base surface of a conical thread as a reference plane during measurement.
In this embodiment: the base surface of the conical thread is used as a reference plane during measurement, and as the result of the measurement is to calculate the pitch diameter of the base surface, if other end surfaces are used as the reference plane, certain errors are caused when the base surface is finally converted into the pitch diameter of the base surface due to abrasion or deformation of the end surfaces.
Example 3
Referring to fig. 1-2, the present embodiment is an improvement on embodiment x. A method for calibrating a conical thread gauge is used for eliminating pitch diameter measurement errors caused by inclination of a thread axis and a measurement axis, and the left and right flanks of a thread are required to be measured respectively.
In this embodiment: the readings were taken on a longitudinal reading screw microscope and recorded as X1. Moving the industrial display longitudinal guide plate along the direction of the small end, rotating the beige line according to the tooth form angle, moving the measuring knife to the tooth side close to the base surface, closely contacting with the tooth side, enabling the center of the beige line to be in the middle position of the tooth side, locking the longitudinal guide plate positioning handle, and recording the longitudinal reading as X2And the transverse reading is recorded as Y1Moving the transverse guide plate to the other side of the conical thread, taking the same-direction measuring knife, enabling the knife edge to be closely tangent to the tooth flank of the other side, and recording a transverse reading Y2In order to eliminate pitch diameter measurement errors caused by inclination of the thread axis and the measurement axis, the left and right thread sides are respectively measured, two opposite measurement knives are taken to measure the pitch diameter of the other side, namely the pitch diameter of the thread side, and the method is the same as that before. Record the longitudinal reading X3The two transverse readings are respectively Y3And Y4. The arithmetic mean of the two measurements was taken as the measurement of the pitch diameter.
Example 4
Referring to fig. 1-2, the present embodiment is an improvement on embodiment 3. A method for calibrating a conical thread gauge, wherein the conical thread ring gauge is an internal thread, the taper of the conical thread ring gauge cannot be measured by an instrument independently, and the inspection and acceptance of the conical thread ring gauge are based on the calibration of a thread plug gauge.
In this embodiment: the conical thread ring gauge is an internal thread, and the taper of the conical thread ring gauge cannot be measured independently by an instrument, so that the inspection and acceptance of the conical thread ring gauge are based on the calibration of a thread plug gauge. The conical thread plug gauge is screwed into the ring gauge by hand until the plug gauge is not screwed. The conical thread ring gauge and the plug gauge are provided with three planes with different heights, the height difference between the reference surface of the conical thread plug gauge and the reference surface of the ring gauge is measured by a height micrometer, when the deviation between the base surfaces of the ring gauge and the calibration gauge in use reaches or exceeds-0.37 mm, the ring gauge is scrapped, and if the deviation is smaller than the height difference, the ring gauge is qualified. Under the condition that exact data of the pitch diameter of the thread ring gauge are required to be given, the pitch diameter of the ring gauge can be calculated through the height difference and the taper of the plug gauge and the ring gauge. If the base surface of the ring gauge is higher than the base surface of the plug gauge, the pitch diameter of the base surface of the ring gauge is larger than the pitch diameter of the base surface of the plug gauge, otherwise, the pitch diameter of the base surface of the ring gauge is smaller than the pitch diameter of the base surface of the plug gauge. The geometrical relationship between the dimensions can be seen in fig. 2. Taking the base surface pitch diameter of the conical thread ring gauge with the taper of 1/16 as an example,
example 5
Referring to fig. 1-2, the present embodiment is an improvement on embodiment 4. A method for calibrating a conical thread gauge comprises the steps of brushing the thread part of a measured thread ring gauge with gasoline and wiping the thread part with white poplin cloth.
In this embodiment: the thread part of the measured thread ring gauge is cleaned by gasoline and cleaned by white poplin cloth, and then the measured thread ring gauge is placed in a thermostatic chamber for constant temperature according to the requirements of JG 888-95 cylindrical thread gauge verification regulations.
Example 6
Referring to fig. 1-2, the present embodiment is an improvement on embodiment 5. A method for calibrating a conical thread gauge comprises the steps that a conical thread ring gauge and a plug gauge are provided with three planes with different heights, and a height micrometer is used for measuring the height difference between a reference surface of the conical thread plug gauge and a reference surface of the ring gauge.
In this embodiment: the conical thread ring gauge and the plug gauge are provided with three planes with different heights, the height difference between the reference surface of the conical thread plug gauge and the reference surface of the ring gauge is measured by a height micrometer, when the deviation between the base surfaces of the ring gauge and the calibration gauge in use reaches or exceeds-0.37 mm, the ring gauge is scrapped, and if the deviation is smaller than the height difference, the ring gauge is qualified. Under the condition that exact data of the pitch diameter of the thread ring gauge are required to be given, the pitch diameter of the ring gauge can be calculated through the height difference and the taper of the plug gauge and the ring gauge.
Example 7
Referring to fig. 1-2, the present embodiment is an improvement on embodiment 6. A method for calibrating the conic screw gauge includes such steps as washing four needed measuring blocks, wiping them with white poplin cloth, putting them on bench, sliding the tail tube and measuring head of instrument to make the measuring ball on internal measuring hook in the middle of screw slots on both sides of screw gauge, moving the handle of bench to find out the turning point, taking off the screw gauge, putting the measuring block on bench, and checking if it returns to zero.
In this embodiment: when in measurement, firstly, the power supply of the universal length measuring instrument is switched on, the instrument switch is turned on, the well-ground measuring block is clamped on the instrument workbench, the tail pipe and the measuring head of the instrument are slid, and the measuring ball on the inner measuring hook is placed in the IV-shaped groove of the measuring block clamp; and moving a handle of the workbench, finding an inflection point, and reading out a numerical value X from a field of view of the reading microscope.
Example 8
Referring to fig. 1-2, the present embodiment is an improvement on embodiment 7. A method for calibrating a conical thread gauge, the geometric parameters of which are recorded radially or axially on a section of the thread axis, the main parameters being as follows: the measuring method comprises the following steps of selecting a double-ball measuring needle of an instrument to measure according to the specification of a measured thread by adopting a corresponding standard according to the specification of the measured thread, and selecting a corresponding force measuring option according to the specification of a thread ring gauge.
In this embodiment: the geometric parameters of the conical thread plug gauge are recorded on the section of the thread axis along the radial direction or the axial direction, and the main parameters are as follows: the measuring method comprises the following steps of selecting a double-ball measuring needle of an instrument to measure according to the specification of a measured thread by adopting a corresponding standard according to the specification of the measured thread, and selecting a corresponding force measuring option according to the specification of a thread ring gauge.
Example 9
Referring to fig. 1-2, the present embodiment is an improvement on embodiment 8. A method for calibrating a conical thread gauge is characterized in that a diameter parameter of a conical thread is defined on a datum plane, and the distance between a small end face (reference plane) and a datum plane of the conical external thread is a datum plane distance. Before the 'probe method' is adopted for measurement, a reference plane needs to be marked on a universal tool microscope, and when the position of the reference plane cannot be marked, the position nearby the reference plane can be marked. In order to locate the marking position (section) on the angular bisector of the thread groove, the conical external thread can be rotated (positioned by adopting the tip) when axial displacement does not occur, and the distance from the marking position to the base surface can be measured.
In this embodiment: the diameter parameter of the conical thread is defined on a datum plane, and the distance between the small end face (the datum plane) and a datum plane of the conical external thread is the datum plane distance. Before the 'probe method' is adopted for measurement, a reference plane needs to be marked on a universal tool microscope, and when the position of the reference plane cannot be marked, the position nearby the reference plane can be marked. In order to locate the marking position (section) on the angular bisector of the thread groove, the conical external thread can be rotated (positioned by adopting the tip) when axial displacement does not occur, and the distance from the marking position to the base surface can be measured.
The measuring block is taken down from a workbench of an instrument, a calibrated thread ring gauge is clamped on the workbench, a tail pipe and a measuring head of the instrument are slid, a measuring ball on an inner measuring hook is placed in the middle of thread grooves corresponding to two sides of the thread ring gauge, a handle of the workbench is moved to find an inflection point, then a numerical value X is read out from a field of view of a reading microscope, the combined size of the measuring block required to be used is calculated according to a formula, and a pair of V-shaped measuring blocks with the same thread form angle with a measured thread and the measuring block with the calculated nominal size are ground together for later use.
And taking off the detected thread ring gauge, clamping the grinded gauge block on a workbench, checking whether the gauge block returns to zero, if the zero point is still X, the value of X is valid, and if not, re-measuring. Namely: m ═ X1-X0(ii) a And finally substituting the value M into a formula 2, and calculating the intermediate diameter D of the thread ring gauge, wherein the value is as follows:
it is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A conical thread gauge calibration method is characterized in that: the method comprises the following steps:
s1, before measurement, knocking out the threads from the pipe, removing burrs and cleaning;
s2, installing the thread between two thimbles of the universal tool microscope through two thimble holes of the conical thread plug gauge, and ensuring the consistency of the thread axis and the measuring axis;
s4, adjusting the focal length of the industrial display to enable the image of the measuring knife to be clear, installing the measuring knife rest on a quasi-plane with a T-shaped groove in the middle of a longitudinal guide plate of the industrial display, and fixing the measuring knife on the measuring knife rest through a spring pressing plate;
and S5, when the cutter is adjusted, the measuring cutter is moved horizontally left and right to contact with the flank, so that the cutter edge is in contact with the flank closely, and the measuring cutter is abutted against the base surface of the conical thread to align the meter line with the cutter edge of the measuring cutter.
2. A method of calibrating a conical thread gauge according to claim 1, wherein: taking the base surface of the conical thread as a reference plane during measurement;
the left and right thread sides are respectively measured for eliminating pitch diameter measurement errors caused by inclination of thread axes and measurement axes, the conical thread ring gauge is an internal thread, and inspection and acceptance are based on the calibrated thread plug gauge.
3. A method of calibrating a conical thread gauge according to claim 2, wherein: the thread part of the measured thread ring gauge is cleaned, four required equal measuring blocks are cleaned, and the thread ring gauge is placed on a workbench.
4. A method of calibrating a conical thread gauge according to claim 3, wherein: and measuring the height difference between the reference surface of the conical thread plug gauge and the reference surface of the ring gauge on three planes of the conical thread ring gauge and the plug gauge with different heights.
5. A method of calibrating a conical thread gauge according to claim 4, wherein: taking the gauge block off a workbench of the instrument, and clamping the calibrated threaded ring on the workbench in a regular manner;
sliding a tail pipe and a measuring head of the instrument, placing a measuring ball on an inner measuring hook in the middle of corresponding thread grooves on two sides of a thread ring gauge, moving a worktable handle to find an inflection point, taking down the detected thread ring gauge, installing and clamping a grinded measuring block on a worktable, checking whether the zero returns, if the zero is still X, the value of X is effective, otherwise, repeating the steps until the zero is X.
6. A method of calibrating a conical thread gauge according to claim 5, wherein: adjusting the parallelism of the two measuring heads, installing a top center on a workbench, placing the measured thread gauge on the top center, vertically placing three pins in a thread groove, adjusting the position of the workbench to find an inflection point in an ocular lens, adjusting the position of the workbench to the maximum value up and down, horizontally adjusting the workbench to the maximum value, rotating the workbench to the minimum value left and right, reading the M value of the middle warp, and converting the M value to obtain the middle warp value d through a formula.
7. A method of calibrating a conical thread gauge according to claim 6, wherein: placing the selected needle roller diameter in the thread groove;
the contact point of the needle roller and the thread profile angle has the four needle diameters on the medium diameter line as the needle diameter, and the needle diameter is the optimal needle diameter.
8. A method of calibrating a conical thread gauge according to claim 7, wherein: the geometric parameters of the conical thread plug gauge are confirmed by recording the geometric parameters on the section of the thread axis along the radial direction or the axial direction, and the parameters comprise: a base plane, a pitch diameter dz, a pitch P and a taper K;
the taper refers to the ratio of the difference between the diameter of the large end and the diameter of the small end on the axis perpendicular to the thread axis and the distance between the two sections, the double-ball measuring needle of the instrument is used for measuring according to the specification of the measured thread by adopting the standard matched with the measured thread, and the corresponding force measuring option is selected according to the specification of the thread ring gauge.
9. A method of calibrating a conical thread gauge according to claim 8, wherein: defining the diameter parameter of the conical thread on a reference plane, and taking the distance between the small end surface and the base surface of the conical external thread as a base surface distance;
when the base surface position cannot be marked, the position near the base surface is marked, the conical external thread is rotated when axial displacement does not occur, the distance from the marking position to the base surface is measured, and the marking position is enabled to be located on an angular bisector of the thread groove.
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Application publication date: 20211022 |
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