CN112857302B - Angle measuring method and method for drawing angle line - Google Patents

Angle measuring method and method for drawing angle line Download PDF

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Publication number
CN112857302B
CN112857302B CN201911189394.9A CN201911189394A CN112857302B CN 112857302 B CN112857302 B CN 112857302B CN 201911189394 A CN201911189394 A CN 201911189394A CN 112857302 B CN112857302 B CN 112857302B
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angle
height
plane
baffle
measured
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CN112857302A (en
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胡双钱
张祥兵
黄鼎
杨志刚
杨浩
周翔
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Commercial Aircraft Corp of China Ltd
Shanghai Aircraft Manufacturing Co Ltd
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Commercial Aircraft Corp of China Ltd
Shanghai Aircraft Manufacturing Co Ltd
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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
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
    • B25H7/00—Marking-out or setting-out work
    • B25H7/04—Devices, e.g. scribers, for marking

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)

Abstract

The invention relates to the field of benchwork processing methods and discloses a method for machining a workpieceAn angle measuring method and a method for drawing an angle line. The angle measuring method comprises the following steps: a sine gauge is used for supporting a plane of the angle to be measured of the workpiece to be parallel to a reference plane, a specific rectangular coordinate system is established, and any point A theoretical coordinate (X) on the supported plane is calculated0，Y0) And bring it into formula H0＝X0sinα+Y0cos alpha + R to find the theoretical height H of the plane to be leveled from the reference plane0Measuring the actual height H of the plane to be cushioned, if | H-H0If | < epsilon, the angle to be measured is qualified, if | H-H0If the value is greater than epsilon, the angle to be measured is unqualified, and epsilon is more than or equal to 0 in the formula. The angle measuring method is simple in operation process and high in measuring precision. A method for drawing angle line includes setting workpiece on sine gauge and finding out theoretical height H of plane to be drawn to reference plane0The marking head of the height gauge is adjusted to be H0And scribing on the workpiece. The marking method has the advantages of simple operation process and high precision of marking angle processing lines.

Description

Angle measuring method and method for drawing angle line
Technical Field
The invention relates to the technical field of bench worker machining methods, in particular to an angle measuring method and an angle line marking method.
Background
The sine gauge is a precise measuring tool which utilizes the sine relation in a trigonometric function and is matched with a measuring block and a lever meter to check the angle or the taper of a workpiece. The method is particularly suitable for measuring workpieces without measuring reference, such as dovetails, multi-angles, conicity of cones and the like. As shown in FIG. 1, the sine gauge comprises a main body 1 'and cylinders 2' arranged at two ends below the main body 1 ', wherein a baffle 3' is arranged at one side of the main body, and the baffle 3 'is arranged perpendicular to the main body 1'.
When the sine gauge is used for measuring the angle, two surfaces perpendicular to the workpiece are abutted to a sine gauge main body 1 ' and a baffle 3 ' respectively, then one surface of the angle to be measured is leveled by heightening a cylinder 2 ' at one end of the sine gauge, and the theoretical height H of the plane to be leveled from a reference plane is calculated0And measuring the actual height H, and comparing the difference between the actual height and the theoretical height to determine whether the angle precision reaches the standard, namely converting the measurement of the angle into the measurement of the plane.
In the prior art, as shown in FIG. 1, the theoretical height H from the plane to be padded to the reference plane is calculated for the angle to be measured0When, usually, formula H is adopted0In the formula, d is the height from the plane of the workpiece to be measured to the intersecting line of the main body and the baffle, and h is the height from the intersecting line of the main body and the baffle to the reference plane after one end of the sine gauge is heightened by padding. However, when h is measured, the measurement needs to be assisted by tools such as a standard check rod, a gauge block and a quarter bend ruler, and is obtained through formula calculation, and when the heights of the sine gauge at one end are different, the values of h are also different, the measurement and calculation processes need to be performed, and the process uses a large number of measuring tools, is complex to operate, and is easy to cause poor measurement precision.
Therefore, it is desirable to invent an angle measurement method to solve the above problems.
Disclosure of Invention
The invention aims to provide an angle measuring method based on a sine gauge, which is simple in angle measuring operation process and high in measuring precision.
The invention aims to provide an angle marking method, which is simple in angle marking processing line operation process and high in precision.
In order to achieve the purpose, the invention adopts the following technical scheme:
provided is an angle measurement method including:
step S1, a plane of the workpiece to be measured is padded to be parallel to the reference plane by a sine gauge;
step S2, establishing a rectangular coordinate system by taking the axis of the cylinder of the sine gauge close to the baffle as the origin of coordinates O, taking the direction parallel to the main body of the sine gauge after being heightened as an X axis, and taking the direction parallel to the baffle after being heightened as a Y axis;
step S3, calculating theoretical coordinates (X) of any point A on the plane to be padded in the rectangular coordinate system0，Y0) Wherein X is0≥0，Y0＞0；
Step S4, according to formula H0＝X0sinα+Y0cos alpha + R, calculating the theoretical height H of the plane to be leveled from the reference plane0In the formula, alpha is a theoretical value of an angle to be measured, and R is the radius of the cylinder at the origin of coordinates O;
step S5, measuring the actual height H of the plane to be padded, if | H-H0If | < epsilon, the angle to be measured is qualified, if | H-H0If the value is greater than epsilon, the angle to be measured is unqualified, and epsilon is more than or equal to 0 in the formula.
Alternatively, the value X of the abscissa of the point A0＝S1-K, formula, S1The theoretical minimum distance from point a to the baffle, and K the minimum distance from the Y-axis to the baffle.
Optionally, the minimum distance K from the Y-axis to the baffle is R-D, where D is the minimum distance from the upper surface of the baffle to the reference plane when the baffle is placed parallel to the reference plane.
Alternatively, the value Y of the ordinate of the A point0＝L1+L2In the formula, L1Is the minimum distance, L, from point A to the upper surface of the body2Is the minimum distance from the upper surface of the body to the X-axis.
Optionally, when the lower surface of the body coincides with the X-axis, the minimum distance L between the upper surface of the body and the X-axis2Is the thickness of the body.
Optionally, in step S1, a workpiece is placed on the sine gauge, two perpendicular surfaces of the workpiece are respectively in contact with the upper surface of the main body and the baffle, and a cylinder pad away from the baffle is filled with gauge blocksHigh H1So that one plane of the angle to be measured is parallel to the reference plane.
Optionally, the height H of the cylindrical pad away from the baffle1＝S2sin α, formula, S2Is the center-to-center distance of the two cylinders of the sine gauge.
Optionally, the actual height H of the padded flat is measured using a height gauge.
Optionally, the actual height H of the flatbed surface is measured by the height gauge for a plurality of times, and the maximum value H of the measured actual height H is recordedmaxAnd minimum value HminIf | Hmax-H0| < epsilon, and | Hmin-H0If the | is less than or equal to the epsilon, the measured angle is qualified, otherwise, the measured angle is unqualified.
There is also provided a method of scribing an angular line, comprising:
step S1, placing the workpiece on a sine gauge, and raising one end of the sine gauge, which is far away from a baffle plate of the sine gauge, to a theoretical height H of the line to be scribed1Theoretical height H of line to be scribed1＝S2sin beta, formula, S2The center distance of two cylinders of the sine gauge is beta which is a theoretical value of an angle to be scribed;
step S2, establishing a rectangular coordinate system by taking the axis of the cylinder close to the baffle as a coordinate origin O, taking the direction parallel to the main body of the sine gauge after being heightened as an X axis and taking the direction parallel to the baffle after being heightened as a Y axis;
step S3, calculating the coordinate (X) of any point on the plane to be marked0,Y0) Wherein X is0≥0，Y0＞0；
Step S4, according to formula H0＝X0sinβ+Y0cos beta + R, calculating the theoretical height H of the distance to be scribed from the reference plane0In the formula, R is the radius of the cylinder at the coordinate origin O;
step S5, the marking head of the height gauge is adjusted to the height H of the theoretical line to be marked0And scribing the workpiece by using the scribing head.
The invention has the beneficial effects that:
the angle measuring method of the invention establishes a rectangular coordinate system which takes the axis of a cylinder close to the baffle as the origin of coordinates O, takes the direction parallel to the main body after being heightened by a sine gauge as the X axis and takes the direction parallel to the baffle as the Y axis, so that the theoretical height H of the plane to be leveled from the reference plane is ensured0Can be represented by formula H0＝X0sinα+Y0cos α + R, where X0And Y0The height H of the plane to be leveled to the reference plane can be obtained directly through standard parameters of the sine gauge and the marked size of the workpiece or obtained through simple calculation, and the theoretical height H of the plane to be leveled to the reference plane is obtained without the aid of auxiliary measurement of tools such as a standard check rod, a measuring block, a quarter bend ruler and the like and calculation0The measuring process is saved, so that the theoretical height H0The calculation precision is higher, and the calculation is simple, and then the detection process of angle is simple and convenient, and measurement accuracy is high.
The marking method of the invention can solve the theoretical height H of the plane to be leveled from the reference plane by the method for establishing the coordinate system0The measuring process is saved, so that the theoretical height H0The calculation precision is higher, and the calculation is simple, so that the scribing method is simple and convenient in process, and the measurement precision is high.
Drawings
FIG. 1 is a diagram illustrating a method for calculating a theoretical height H of a plane to be measured, in which an angle α is flattened, from a reference plane in the prior art0Schematic diagram of the method;
FIG. 2 is a diagram for calculating the theoretical height H of the plane to be measured alpha from the reference plane0Schematic diagram of the method;
FIG. 3 is a schematic diagram illustrating the method of calculating the distance K from the origin of coordinates O to the baffle in accordance with the present invention;
fig. 4 is a schematic drawing of the scribing principle of one side of the angle β to be scribed in the present invention.
In the figure:
1' -a body; 2' -a cylinder; 3' -a baffle plate; 4' -a workpiece; 5' -a reference plane;
1-a body; 2-a cylinder; 3-a baffle plate; 4-a workpiece; 5-a reference plane; 6-measuring block.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The sine gauge is widely applied to measurement of workpieces without measuring reference, such as dovetails, multiple angles, conicity of cones and the like. As shown in FIG. 1, the theoretical height H from the plane to be padded to the reference plane is calculated at the angle to be measured0When, usually, formula H is adopted0In the formula, d is the height from the padded plane of the angle to be measured of the workpiece 4 'to the intersecting line of the main body 1' and the baffle 3 ', and h is the height from the intersecting line of the main body 1' and the baffle 3 'to the reference plane 5' after the sine gauge is padded. The measurement of h needs to be assisted by tools such as a standard check rod, a gauge block and a right-angle bent ruler for measurement and is obtained through formula calculation, the heights of the raised ends of the sine gauges are different, the values of h are different, the measurement and calculation processes need to be carried out, measuring tools are used in the process, the operation is complex, and the measurement precision is poor easily.
In view of the above problems, the present embodiment provides an angle measuring method, which can be used in the technical field of measuring the angle of a workpiece by a bench worker. Referring to fig. 2, the angle measuring method includes:
step S1, a plane of the workpiece 4 to be measured is padded to be parallel to the reference plane 5 by a sine gauge;
step S2, establishing a rectangular coordinate system by taking the axis of the cylinder of the sine gauge close to the baffle 3 as the origin of coordinates O, taking the direction parallel to the main body 1 after the sine gauge is lifted as the X axis, and taking the direction parallel to the baffle 3 after the sine gauge is lifted as the Y axis;
step S3, calculating theoretical coordinates (X) of any point A on the plane to be padded in the rectangular coordinate system0，Y0) Wherein X is0≥0，Y0＞0；
Step S4, according to formula H0＝X0sinα+Y0cos alpha + R, calculating the theoretical height H of the plane to be leveled from the reference plane 50In the formula, alpha is a theoretical value of an angle to be measured, and R is the radius of the cylinder 2 at the origin of coordinates O;
step S5, measuring the actual height of the plane to be paddedH, if | H-H0If | < epsilon, the angle to be measured is qualified, if | H-H0If the value is greater than epsilon, the angle to be measured is unqualified, and epsilon is more than or equal to 0 in the formula.
Establishing the rectangular coordinate system to enable the leveled plane to be away from the theoretical height H of the reference plane0Can be represented by formula H0＝X0sinα+Y0cos α + R, where X0And Y0The height H of the plane to be leveled to the reference plane can be obtained directly through standard parameters of the sine gauge and the marked size of the workpiece or obtained through simple calculation, and the theoretical height H of the plane to be leveled to the reference plane is obtained without the aid of auxiliary measurement of tools such as a standard check rod, a measuring block, a quarter bend ruler and the like and calculation0The measuring process is saved, so that the theoretical height H0The calculation precision is higher, and the calculation is simple, and then the detection process of angle is simple and convenient, and measurement accuracy is high.
In step S1, the workpiece 4 is placed on the sine gauge, two perpendicular surfaces of the workpiece 4 are respectively abutted against the upper surface of the main body 1 and the baffle 3, and the cylinder 2 away from the baffle 3 is lifted up to a distance H from the reference plane by the gauge block 61So that one plane of the angle to be measured is parallel to the reference plane 5. Height H of the mat height1＝S2sin alpha, where alpha is the theoretical value of the angle to be measured, S2The distance between the centers of the two cylinders 2 is a sine rule. Center distance S between two cylinders 2 of sine gauge2The center distance S of the existing standard sine gauge is the basic parameter of the sine gauge2Typically 100mm or 200mm, and the center-to-center distance S of the sine gauge to be used in actual measurement2Directly substituting into a formula.
In step 3, when calculating the theoretical coordinate of any point on the padded flat plane in the rectangular coordinate system, a more special endpoint on the padded flat plane can be selected, so that calculation can be performed by means of the size marked on the drawing, and the coordinate value can be conveniently obtained. This embodiment is described by taking the example that the point a is located at the left end of the plane to be padded.
Value X of the abscissa of the point A0＝S1-K, formula, S1From point A to the baffle 3The theoretical minimum distance, K, is the minimum distance of the Y axis to the baffle 3. As shown in fig. 2, the theoretical minimum distance S from point a to the baffle 31The value of (b) is the distance between the two points (AB), and the drawing size of the workpiece (4) can be found.
Alternatively, as shown in fig. 3, the minimum distance K from the baffle 3 to the Y-axis is R-D, where R is the radius of the cylinder 2 at the origin of coordinates O, which is a fixed parameter of the sine gauge; d is the minimum distance between the upper surface of the baffle 3 and the reference plane 5 when the baffle 3 is placed in parallel with the reference plane 5, and D can be directly measured by a ruler or a caliper.
Value Y of the ordinate of the A point0＝L1+L2In the formula, L1Is the minimum distance, L, from point A to the upper surface of the body 12The minimum distance from the upper surface of the body 1 to the X-axis. As shown in FIG. 3, when the lower surface of the main body 1 coincides with the X-axis, the minimum distance L between the upper surface of the main body 1 and the X-axis2The thickness of the main body 1 is the basic parameter of the sine gauge, and can be obtained by searching a parameter table of the sine gauge, L1The drawing of the workpiece 4 can be found for the minimum distance from the point a to the upper surface of the main body 1.
In step S4, the theoretical coordinates (X) of point A obtained in step S30，Y0) Wherein X is0≥0，Y0Substitution of > 0 into the formula, H0＝X0sinα+Y0cos alpha + R to find the theoretical height H of the plane to be leveled from the reference plane 50The derivation of the above formula is as follows:
taking the example that point a is located at the left end of the plane to be padded, as shown in fig. 2,
H0h1+ h2+ h3+ R formula (1)
Wherein h1 ═ S (S)1-K) sin alpha formula (2)
h2＝L1cos alpha type (3)
h3＝L2cos alpha type (4)
The following were obtained by bringing formulae (2), (3) and (4) into formula (1):
H0＝h1+h2+h3+R
＝(S1-K)sinα+L1cosα+L2cosα+R
＝(S1-K)sinα+(L1+L2)cosα+R
＝X0sinα+Y0cosα+R
in step S4, the actual height H of the padded flat surface is measured using a height gauge, and preferably, the actual height H of the padded flat surface is measured by the height gauge a plurality of times, and the maximum value H of the measured actual height H is recordedmaxAnd minimum value HminIf | Hmax-H0| < epsilon, and | Hmin-H0If the | is less than or equal to the epsilon, the measured angle is qualified, otherwise, the measured angle is unqualified. In other embodiments, the actual height H of the cushioned surface may also be measured by other means.
The present invention also provides a method for drawing an angle line, as shown in fig. 4, including:
step S1, placing the workpiece 4 on a sine gauge, and raising one end of the sine gauge, which is far away from a baffle 3, to the theoretical height H of the line to be scribed0Theoretical height H of line to be scribed0＝S2sin beta, formula, S2The center distance of two cylinders of the sine gauge, beta is the theoretical value of the angle to be scribed;
step S2, establishing a rectangular coordinate system by taking the axis of the cylinder 2 close to the baffle 3 as the origin of coordinates O, taking the direction parallel to the main body 1 after being heightened by the sine gauge as an X axis, and taking the direction parallel to the baffle 3 after being heightened by the sine gauge as a Y axis;
step S3, calculating the coordinate (X) of any point on the plane to be marked0,Y0) Wherein X is0≥0，Y0＞0；
Step S4, according to formula H0＝X0sinβ+Y0cos beta + R, calculating the theoretical height H of the reference plane 5 to be scribed0In the formula, R is the radius of the cylinder 2 at the origin of coordinates O;
step S5, the marking head of the height gauge is adjusted to the height H of the theoretical line to be marked0And a scribing head is used to scribe a line on the workpiece 4.
The method can realize the processingThe method is used for calculating the theoretical height H of the plane to be leveled from the reference plane0The measuring process is saved, so that the theoretical height H0The calculation precision is higher, and the calculation is simple, so that the scribing method is simple and convenient in process, and the measurement precision is high.
The method of drawing an angle line, the placement of the workpiece 4 in step S1, and the coordinates (X) of any point on the plane to be drawn in step S30,Y0) The calculation process is consistent with the angle measurement method, and is not described herein again.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims (10)

1. An angle measuring method, characterized by comprising:
step S1, a plane of the workpiece (4) with the angle to be measured is padded to be parallel to the reference plane (5) by a sine gauge;
step S2, establishing a rectangular coordinate system by taking the axis of the cylinder (2) of the sine gauge close to the baffle (3) as the origin of coordinates O, the direction parallel to the main body (1) after the sine gauge is lifted up as an X axis, and the direction parallel to the baffle (3) after the sine gauge is lifted up as a Y axis;
step S3, calculating theoretical coordinates (X) of any point A on the plane to be padded in the rectangular coordinate system0，Y0) Wherein X is0≥0，Y0＞0；
Step S4, according to formula H0＝X0sinα+Y0cos alpha + R, calculating the theoretical height H of the plane to be leveled from the reference plane (5)0In the formula, alpha is a theoretical value of an angle to be measured, and R is the radius of the cylinder (2) at the origin of coordinates O;
step S5, measuring the actual height H of the plane to be padded, if | H-H0If | < epsilon, the angle to be measured is qualified, if | H-H0If | is greater than ε, thenThe measured angle is unqualified, and epsilon is more than or equal to 0 in the formula.
2. The angle measuring method according to claim 1, wherein a value X of the abscissa of the point a0＝S1-K, formula, S1Is the theoretical minimum distance from the point A to the baffle (3), and K is the minimum distance from the Y axis to the baffle (3).
3. The angle measurement method according to claim 2, characterized in that the minimum distance K from the Y axis to the baffle (3) is R-D, where D is the minimum distance of the upper surface of the baffle (3) from the reference plane (5) when the baffle (3) is placed parallel to the reference plane (5).
4. Angle measuring method according to claim 1, characterized in that the value Y of the ordinate of point A0＝L1+L2In the formula, L1Is the minimum distance from point A to the upper surface of the body (1), L2Is the minimum distance from the upper surface of the main body (1) to the X axis.
5. Angle measuring method according to claim 4, characterized in that the minimum distance L between the upper surface of the body (1) and the X-axis when the lower surface of the body (1) coincides with the X-axis2Is the thickness of the body (1).
6. The angle measuring method according to claim 1, wherein in performing step S1, a workpiece (4) is placed on the sine gauge such that two perpendicular surfaces of the workpiece (4) are respectively in contact with the upper surface of the main body (1) and the baffle (3), and the cylindrical body (2) remote from the baffle (3) is raised by a height H by a gauge block (6)1So that one plane of the angle to be measured is parallel to the reference plane (5).
7. Angle measuring method according to claim 6, characterized in that the cylinder (2) remote from the baffle (3) is raised by a height H1＝S2sin α, formula, S2Is the center distance of the two cylinders (2) of the sine gauge.
8. The angle measuring method according to claim 1, wherein the actual height H of the flat surface to be padded is measured using a height gauge.
9. The angle measuring method according to claim 8, wherein the actual height H of the flat surface to be leveled is measured a plurality of times by the height gauge, and the maximum value H of the measured actual heights H is recordedmaxAnd minimum value HminIf | Hmax-H0| < epsilon, and | Hmin-H0If the | is less than or equal to the epsilon, the measured angle is qualified, otherwise, the measured angle is unqualified.
10. A method of lining an angle, comprising:
step S1, placing the workpiece (4) on a sine gauge, and raising one end of the sine gauge, which is far away from a baffle (3), to a theoretical height H of the line to be scribed0Theoretical height H of line to be scribed0＝S2sin beta, formula, S2The center distance of two cylinders (2) of the sine gauge is beta which is a theoretical value of an angle to be scribed;
step S2, establishing a rectangular coordinate system by taking the axis of the cylinder (2) close to the baffle (3) as a coordinate origin O, taking the direction parallel to the main body (1) after the sine gauge is lifted as an X axis, and taking the direction parallel to the baffle (3) after the sine gauge is lifted as a Y axis;
step S3, calculating the coordinate (X) of any point on the plane to be marked0,Y0) Wherein X is0≥0，Y0＞0；
Step S4, according to formula H0＝X0sinβ+Y0cos beta + R, calculating the theoretical height H of the reference plane (5) from the line to be scribed0In the formula, R is the radius of the cylinder (2) at the coordinate origin O;
step S5, the marking head of the height gauge is adjusted to the height H of the theoretical line to be marked0In combination with each otherThe scribing head scribes on the workpiece (4).
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