CN114178904B - Resolution measuring method of machine tool measuring system - Google Patents
Resolution measuring method of machine tool measuring system Download PDFInfo
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Abstract
The invention discloses a resolution measuring method of a machine tool measuring system, wherein two measuring points, namely an initial point and a comparison point, are arranged on a reference surface of a reference block which forms an included angle theta with a coordinate axis of a machine tool, a contact type measuring head is adopted to measure the initial point and the comparison point along the coordinate axis direction of the machine tool, the obtained actual measuring values are compared to obtain a difference value, and if the difference value is not 0, the distance between the comparison point and the initial point is reduced; if the difference value is 0, increasing the distance between the comparison point and the initial point, and continuously adjusting the distance between the initial point and the comparison point until the distance between the initial point and the comparison point is increased for the first time, or the distance change value of the comparison point in the measurement direction is less than 1 um; at this time, if the difference between the initial point and the comparison point is 0, the difference between the initial point and the comparison point at the last time in the measurement direction which is not 0 is the resolution of the machine tool measurement system.
Description
Technical Field
The invention belongs to the technical field of resolution test, and particularly relates to a resolution measurement method of a machine tool measurement system.
Background
At present, the mechanical manufacturing industry is rapidly developing, the requirements on the size and the manufacturing precision of parts are higher and higher, and the part size tolerance of a large part can reach below 0.05 mm. In the manufacturing process, in order to meet the high-precision manufacturing requirement of large parts, intermediate detection needs to be set in the manufacturing process, and processing technological parameters are adjusted in a targeted manner according to detection results. The traditional intermediate detection mode is to detach the machined part from a machine tool and transfer the machined part to a three-coordinate measuring machine for contact detection. In the mode, after the parts are detached from the machine tool, due to the release of internal stress, the parts are deformed to different degrees in the transferring process, so that the high-precision size of the parts detected by the three-coordinate measuring machine can not be measured and qualified, further more parts information needs to be collected for comprehensive evaluation, the manufacturing period is prolonged, and the manufacturing cost is increased; furthermore, as the size of the parts increases, conventional coordinate measuring machines may not have the stroke required to inspect the parts. Therefore, in-situ on-machine inspection of parts in a machine tool is one of the operational solutions for inspecting large parts in the manufacturing process.
In order to measure a part in a machine tool, the reliability of the on-machine measurement result must be ensured, and the measurement system analysis is a method for confirming whether the measurement result is reliable, so as to evaluate whether the measurement system is suitable for the current detection requirement. The resolution is the inherent characteristic of the measuring tool, and is the capability of detecting the minimum change of the characteristic value by the instrument, and the actual resolution of the measuring system has great influence on the uncertainty of the measurement. When analyzing the measuring system, it should be ensured that the measuring system has sufficient resolution, but there is no effective method for quickly obtaining the actual resolution value of the measuring system. Therefore, the invention provides a method for testing the actual resolution of the measuring system of the on-machine detection system, which can obtain the actual resolution of the measuring system in a short time by using a simpler auxiliary tool.
Disclosure of Invention
The invention aims to provide a resolution measuring method of a machine tool measuring system, which aims to solve the problems and has the advantages of convenience and quickness in operation and good accuracy. According to the invention, the distance between the initial point and the comparison point on the reference edge is continuously adjusted, and the adjustment distance between the initial point and the comparison point is gradually shortened until the distance of single adjustment is very small, so that the final measurement result which can be distinguished is the resolution of the machine tool measurement system.
The invention is mainly realized by the following technical scheme:
a resolution measurement method of a machine tool measurement system is characterized in that two measurement points, namely an initial point and a comparison point, are arranged on a reference surface of a reference block forming an included angle theta with a coordinate axis of a machine tool, a contact type measuring head is adopted to measure the initial point and the comparison point along the coordinate axis direction of the machine tool, the obtained actual measurement values are compared to obtain a difference value, and if the difference value is not 0, the distance between the comparison point and the initial point is reduced; if the difference value is 0, increasing the distance between the comparison point and the initial point, and continuously adjusting the distance between the initial point and the comparison point until the distance between the initial point and the comparison point is increased for the first time, or the distance change value of the comparison point in the measurement direction is less than 1 um; at this time, if the difference between the initial point and the comparison point is 0, the difference between the initial point and the comparison point at the last time in the measurement direction is not 0, which is the resolution of the machine tool measurement system.
In order to better implement the invention, further, the method comprises the following steps:
step S100: fixing a reference block on a workbench, selecting any measuring surface on the reference block as a reference surface, wherein the included angle between the reference surface and the coordinate axis of the machine tool is theta, and the distance between the contact part of the contact measuring head and the reference surface and the contact part of the contact measuring head and the coordinate plane is smaller than or equal to 1/1000 of the radius R of the contact measuring head;
step S200: respectively taking an initial point and a comparison point which are far away from each other on a reference surface of the reference block, wherein the contact type measuring head cannot interfere with the reference block when the initial point and the comparison point are measured;
step S300: measuring an initial point and a comparison point along the coordinate axis direction of the machine tool by using a contact measuring head, and recording the measured values of the two points in the coordinate axis direction;
step S400: calculating the difference between the initial point and the comparison point in the measuring direction, and if the difference is not 0, adjusting the position of the comparison point to reduce the distance between the comparison point and the initial point; if the difference is 0, adjusting the position of the comparison point to increase the distance between the comparison point and the initial point;
step S500: when increasing or decreasing the distance between the initial point and the comparison point, the initial adjustment distance of the comparison point is 1/2 of the distance between the initial point and the comparison point, the steps S300 and S400 are repeated, the adjustment distance of each comparison point is 1/2 of the adjustment distance of the last comparison point until the distance between the initial point and the comparison point is increased for the first time, or the distance change value of the comparison point in the measuring direction is less than 1 um; at this time, if the difference between the initial point and the comparison point is 0, the difference between the initial point and the comparison point at the last time in the measurement direction is not 0, which is the resolution of the machine tool measurement system.
In order to better implement the present invention, further, in step S200, the initial point is close to the edge of the reference plane, and the distance between the initial point and the edge is smaller than the diameter D of the contact probe and larger than the radius R of the contact probe, so as to ensure that the contact probe does not interfere with the reference block when the initial point and the comparison point are measured.
In order to better implement the present invention, further, in step S300, the contact probe performs a measurement initial point and a comparison point in a direction from the outside of the measured reference plane to the reference plane.
In order to better implement the present invention, further, in step S400, if the difference between the initial point and the initial comparison point is 0, the included angle θ between the reference plane and the machine coordinate axis is increased so that the difference is not 0.
In order to better implement the present invention, further, the reference block has three mutually perpendicular planes, and the length, width and height of the three mutually perpendicular planes are: the length x width dimensions are not less than 100mm x 100mm and not more than 200 x 200mm, and the height is not less than 20 mm.
In order to better implement the invention, further, the reference surface roughness of the reference block is less than Ra1.6.
The invention has the beneficial effects that:
according to the invention, the distance between the initial point and the comparison point on the reference edge is continuously adjusted, and the adjustment distance between the initial point and the comparison point is gradually shortened until the distance for single adjustment is very small, at the moment, the measurement result which can be finally resolved is the resolution of the machine tool measurement system, so that the method has the advantages of convenience and rapidness in operation and good accuracy.
Drawings
FIG. 1 is a schematic diagram of a reference block;
FIG. 2 is a schematic view of the overall measurement configuration of the present invention;
fig. 3 is a schematic diagram of the measurement of the present invention.
Wherein: 1-a contact probe; 2-a reference plane; 3-reference block.
Detailed Description
Example 1:
a resolution measurement method of a machine tool measurement system is characterized in that two measurement points, namely an initial point and a comparison point, are arranged on a reference surface 2 of a reference block 3 forming an included angle theta with a coordinate axis of a machine tool, a contact type measuring head 1 is adopted to measure the initial point and the comparison point along the coordinate axis direction of the machine tool, the obtained actual measurement values are compared to obtain a difference value, and if the difference value is not 0, the distance between the comparison point and the initial point is reduced; if the difference value is 0, increasing the distance between the comparison point and the initial point, and continuously adjusting the distance between the initial point and the comparison point until the distance between the initial point and the comparison point is increased for the first time, or the distance change value of the comparison point in the measurement direction is less than 1 um; at this time, if the difference between the initial point and the comparison point is 0, the difference between the initial point and the comparison point at the last time in the measurement direction is not 0, which is the resolution of the machine tool measurement system.
Further, if the difference is not 0, adjusting the position of the comparison point to reduce the distance between the comparison point and the initial point; if the difference is 0, the position of the comparison point is adjusted to increase the distance between the comparison point and the initial point.
Further, when increasing or decreasing the distance between the initial point and the comparison point, the initial adjustment distance of the comparison point is 1/2 of the distance between the initial point and the comparison point. Then the adjusting distance of each comparison point is 1/2 of the adjusting distance of the last comparison point until the distance between the initial point and the comparison point is increased for the first time or the distance change value of the comparison point in the measuring direction is less than 1 um; at this time, if the difference between the initial point and the comparison point is 0, the difference between the initial point and the comparison point at the last time in the measurement direction is not 0, which is the resolution of the machine tool measurement system.
Further, an angle between the reference plane 2 and the coordinate axis of the machine tool is θ, so that a distance between a contact portion of the contact probe 1 and the reference plane 2 and a contact portion of the contact probe 1 and the coordinate plane is less than or equal to 1/1000 of the radius R of the contact probe 1.
Further, the initial point is close to the edge of the reference plane 2, and the distance dimension from the edge is smaller than the diameter D of the contact probe 1 and larger than the radius R of the contact probe 1, so as to ensure that the contact probe 1 does not interfere with the reference block 3 when the initial point and the comparison point are measured.
According to the invention, the distance between the initial point and the comparison point on the reference edge is continuously adjusted, and the adjustment distance between the initial point and the comparison point is gradually shortened until the distance for single adjustment is very small, at the moment, the measurement result which can be finally resolved is the resolution of the machine tool measurement system, so that the method has the advantages of convenience and rapidness in operation and good accuracy.
Example 2:
a resolution measurement method of a machine tool measurement system comprises the following steps:
step S100: fixing a reference block 3 on a workbench, selecting any measuring surface on the reference block 3 as a reference surface 2, wherein an included angle between the reference surface 2 and a machine tool coordinate axis is theta, and ensuring that the distance between a contact part of the contact measuring head 1 and the reference surface 2 and a contact part of the contact measuring head 1 and a coordinate plane is smaller than or equal to 1/1000 of the radius R of the contact measuring head 1;
step S200: an initial point and a comparison point which are far away from each other are respectively taken on a reference surface 2 of a reference block 3, and the contact type measuring head 1 cannot interfere with the reference block 3 when the initial point and the comparison point are measured;
step S300: measuring an initial point and a comparison point along the coordinate axis direction of the machine tool by using the contact type measuring head 1, and recording the measured values of the two points in the coordinate axis direction;
step S400: calculating the difference between the initial point and the comparison point in the measuring direction, and if the difference is not 0, adjusting the position of the comparison point to reduce the distance between the comparison point and the initial point; if the difference is 0, adjusting the position of the comparison point to increase the distance between the comparison point and the initial point;
step S500: when increasing or decreasing the distance between the initial point and the comparison point, the initial adjustment distance of the comparison point is 1/2 of the distance between the initial point and the comparison point, the steps S300 and S400 are repeated, the adjustment distance of each comparison point is 1/2 of the adjustment distance of the last comparison point until the distance between the initial point and the comparison point is increased for the first time, or the distance change value of the comparison point in the measuring direction is less than 1 um; at this time, if the difference between the initial point and the comparison point is 0, the difference between the initial point and the comparison point at the last time in the measurement direction is not 0, which is the resolution of the machine tool measurement system.
Further, in step S200, the initial point is close to the edge of the reference plane 2, and the distance dimension from the edge is smaller than the diameter D of the contact measuring head 1 and larger than the radius R of the contact measuring head 1, so as to ensure that the contact measuring head 1 does not interfere with the reference block 3 when measuring the initial point and the comparison point.
Further, in step S300, the contact type probe 1 performs the measurement initial point and the comparison point in the direction of the reference plane 2 along the outside of the measured reference plane 2.
Further, in step S400, if the difference between the initial point and the initial comparison point is 0, the angle θ between the reference plane 2 and the machine coordinate axis is increased so that the difference is not 0.
Further, the reference block 3 has three mutually perpendicular planes, and the length, width and height of the three mutually perpendicular planes are as follows: the length and width dimensions are not less than 100mm multiplied by 100mm and not more than 200 multiplied by 200mm, and the height is not less than 20 mm.
Further, the roughness of the reference surface 2 of the reference block 3 is less than Ra1.6.
According to the invention, the distance between the initial point and the comparison point on the reference edge is continuously adjusted, and the adjustment distance between the initial point and the comparison point is gradually shortened until the distance for single adjustment is very small, at the moment, the measurement result which can be finally resolved is the resolution of the machine tool measurement system, so that the method has the advantages of convenience and rapidness in operation and good accuracy.
Example 3:
a resolution measuring method of a machine tool measuring system is characterized in that two measuring points, namely an initial point and a comparison point, are arranged on a reference surface 2 of a reference block 3 which forms a certain included angle theta with a machine tool coordinate axis, the initial point and the comparison point are measured along the machine tool coordinate axis direction by adopting a contact type measuring head 1, obtained actual measuring values are compared with each other, and the resolution value of the machine tool measuring system is obtained by continuously adjusting the distance between the measuring points.
Further, the contact probe 1 is used to perform the measurement initial point and the comparison point along the machine tool coordinate axis and from the outside of the measured reference surface 2 to the reference surface 2.
Further, calculating a difference value between the initial point and the comparison point in the measurement direction, and if the difference value is not 0, adjusting the position of the comparison point to reduce the distance between the comparison point and the initial point; if the difference is 0, the position of the comparison point is adjusted to increase the distance between the comparison point and the initial point.
Further, when the distance between the initial point and the comparison point is increased or decreased, the adjustment distance of the first comparison point is 1/2 of the distance between the initial point and the comparison point, and thereafter, the adjustment distance of each comparison point is 1/2 of the adjustment distance of the last comparison point, so that the position of the comparison point is continuously adjusted according to the rule until the distance between the initial point and the comparison point is increased for the first time or the distance change value of the comparison point in the measurement direction is less than 1um, at this time, if the difference between the initial point and the comparison point is 0, the difference between the last initial point and the comparison point in the measurement direction which is not 0 is the resolution of the machine tool measurement system; otherwise, the resolution is better than the repeatability of the measuring system, and the measurement is finished.
Further, the implementation steps of the invention are as follows:
the first step is as follows: a reference block 3 is prepared, as shown in fig. 1 and 2, the reference block 3 is a rectangular parallelepiped, the length and width dimensions of the reference block are between 100 × 100mm and 200 × 200mm, the height is not less than 20mm, and the surface roughness of the reference block 3 is less than ra 1.6.
The second step is that: as shown in fig. 2, a reference block 3 is fixed to a table, and a measurable surface is selected as a reference surface 2 so as to have an angle θ with respect to the machine axis, the angle θ being such that the distance between the contact portion of the stylus 1 and the reference surface 2 and the contact portion of the stylus 1 and the virtual coordinate plane is not greater than 1/1000 of the radius R of the stylus 1.
The third step: one point is taken as an initial point on the reference plane 2 of the reference block 3, another point is taken as a comparison point at a position far away from the initial point on the same reference plane 2, the initial point is close to the edge of the selected reference plane 2, the distance edge size is smaller than the diameter D of the contact measuring head 1 and larger than the radius R of the contact measuring head 1, and the contact measuring head 1 is ensured not to interfere with the reference block 3 when the initial point and the comparison point are measured.
The fourth step: the contact type measuring head 1 is used for measuring an initial point and a comparison point along the direction of the coordinate axis of the machine tool, and measuring values of the two points in the direction of the coordinate axis are recorded.
The fifth step: and comparing the difference value of the initial point and the first comparison point in the coordinate axis direction, if the difference value is 0, increasing the included angle theta between the reference surface 2 and the machine tool coordinate plane and re-measuring, if the difference value is not 0, adjusting the comparison point to be close to the initial point, and the moving distance of the comparison point is 1/2 of the distance between the initial point and the comparison point.
And a sixth step: and measuring an initial point and an adjusted comparison point along the coordinate axis of the machine tool by using the contact type measuring head 1, and recording the measured values of the two points in the coordinate axis direction.
The seventh step: comparing the difference d of the initial point and the comparison point in the coordinate axis direction, if the difference d is not 0, adjusting the comparison point to be close to the initial point, wherein the moving distance of the comparison point is 1/2 of the moving distance of the previous comparison point; if the difference d is 0, the comparison point is adjusted to be far away from the initial point, and the moving distance of the comparison point is 1/2 of the moving distance of the last comparison point.
Eighth step: and repeating the sixth step and the seventh step to continuously adjust the position of the comparison point according to the rule until the distance between the initial point and the comparison point is increased for the first time or the distance change value of the comparison point in the measuring direction is less than 1 um. At this time, if the difference between the initial point and the comparison point is 0, the difference between the initial point and the comparison point at the last time in the measuring direction is not 0, and the difference is the resolution of the machine tool measuring system; otherwise, the resolution is better than the repeatability of the measuring system, and the measurement is finished.
According to the invention, the distance between the initial point and the comparison point on the reference edge is continuously adjusted, and the adjustment distance between the initial point and the comparison point is gradually shortened until the distance for single adjustment is very small, at the moment, the measurement result which can be finally resolved is the resolution of the machine tool measurement system, so that the method has the advantages of convenience and rapidness in operation and good accuracy.
Example 4:
a resolution measuring method of a machine tool measuring system is shown in figure 1, and comprises the requirement of a reference block 3, wherein the surface roughness of the reference block 3 is less than Ra1.6. The radius of the ball head of the contact measuring head 1 used in the example is 3mm, the length, the width and the height of the reference block 3 are 120mm, 120mm and 25mm, and a measuring coordinate system is established at the top point of the reference block 3.
As shown in fig. 2, the reference block 3 is placed on a machine tool table and fixed, and the included angle θ between the reference surface 2 and the X axis of the machine tool is adjusted by using a dial gauge so that the Y direction deviation of the reference surface 2 is 0.1mm in every 100mm in the X direction, and at this time, the distance between the contact point between the contact type probe 1 and the reference surface 2 and the contact point between the probe and the XY surface of the machine tool coordinate is about 0.003 mm.
Further, as shown in fig. 3, where a1 is the initial point; a2 is the first comparison point; a3 is the second comparison point; a4 is the third comparison point; a5 is the fourth comparison point. Two measuring points are selected on a reference surface 2 by using a contact type measuring head 1 to measure along the Y axis of the machine tool, the selected measuring points are positioned 4mm below the upper surface of a reference block 3 and distributed at two ends of the reference surface 2 in the length direction, and the initial distance between the two measuring points is 100 mm. A point close to the origin of coordinates is taken as the initial point a1, and a point far from the origin of coordinates is taken as the first comparison point a 2.
Further, as shown in fig. 3, after the measurement is completed, the difference between the measurement values of the initial point a1 and the first comparison point a2 in the Y direction is calculated, if the difference is 0, the measurement system cannot distinguish the difference between the Y positions of the two points, the resolution is insufficient, and the included angle θ between the reference plane 2 and the X axis of the machine tool should be increased for re-measurement; if the difference is not 0 and meets the position relationship of the two measurement points in the Y direction, the measurement system can distinguish the difference between the two points in the Y direction, and the distance between the two measurement points should be reduced for further measurement.
Further, the position of the comparison point is adjusted by moving the position of the comparison point in the X direction by 1/2 mm, i.e. 50mm, which is the initial distance, to obtain a second comparison point a 3.
Further, an initial point a1 and a second comparison point a3 are measured along the Y axis of the machine tool, after the measurement is completed, the difference between the measured values of the initial point a1 and the second comparison point a3 in the Y direction is calculated, if the difference is 0, the measurement system cannot distinguish the difference between the Y position of the two points, the resolution is insufficient, and the distance between the two measurement points should be increased for further measurement; if the difference is not 0 and meets the position relationship of the two measurement points in the Y direction, the measurement system can distinguish the difference between the two points in the Y direction, and the distance between the two measurement points should be reduced for further measurement.
Further, the position of the comparison point is adjusted by moving the position of the comparison point in the X direction by 1/2, i.e. 25mm, which is the last moving length, to obtain a third comparison point a 4.
Further, the process of measuring the initial point a1 and the comparison point along the Y axis of the machine tool, calculating the difference between the measured values of the initial point and the comparison point in the Y direction after the measurement is completed, and adjusting the position of the comparison point is repeated until the distance moved by the comparison point each time is small enough, so that the distance change value of the comparison point in the measurement direction each time is small enough, in this case, after 7 times of movement of the comparison point, the distance moved by the comparison point is less than 1mm at a single time, and the position change of the comparison point on the Y axis is less than 1um, so that the measurement can be stopped.
Further, if the distance between the two measuring points needs to be increased because the measuring system cannot distinguish the difference of the Y-direction positions between the two points in the process of repeatedly measuring the initial point and the comparison point along the Y axis of the machine tool, the difference value between the initial point and the comparison point in the measuring direction is effectively distinguished for the last time, namely the distinguishing power of the machine tool measuring system; otherwise, the resolution of the measuring system is better than the repeatability of the measuring system, and the measurement is finished.
According to the invention, the distance between the initial point and the comparison point on the reference edge is continuously adjusted, and the adjustment distance between the initial point and the comparison point is gradually shortened until the distance for single adjustment is very small, at the moment, the measurement result which can be finally resolved is the resolution of the machine tool measurement system, so that the method has the advantages of convenience and rapidness in operation and good accuracy.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (6)
1. A resolution measurement method of a machine tool measurement system is characterized in that two measurement points, namely an initial point and a comparison point, are arranged on a reference surface (2) of a reference block (3) forming an included angle theta with a coordinate axis of a machine tool, and if the difference value between the initial point and the initial comparison point is 0, the included angle theta between the reference surface (2) and the coordinate axis of the machine tool is increased to ensure that the difference value is not 0; measuring an initial point and a comparison point by using a contact measuring head (1) along the coordinate axis direction of a machine tool, comparing the obtained actual measurement values to obtain a difference value, and reducing the distance between the comparison point and the initial point if the difference value is not 0 and accords with the position relation of the two measurement points in the measurement direction; if the difference value is 0, increasing the distance between the comparison point and the initial point, and continuously adjusting the distance between the initial point and the comparison point until the distance between the initial point and the comparison point is increased for the first time, or the distance change value of the comparison point in the measurement direction is less than 1 um; at this time, if the difference between the initial point and the comparison point is 0, the difference between the last initial point and the comparison point in the measurement direction, which is not 0, is the resolution of the machine tool measurement system.
2. The method for measuring the resolving power of a machine tool measuring system according to claim 1, comprising the steps of:
step S100: fixing a reference block (3) on a workbench, selecting any measuring surface on the reference block (3) as a reference surface (2), wherein the included angle between the reference surface (2) and the coordinate axis of the machine tool is theta, and the distance between the contact part of the contact measuring head (1) and the reference surface (2) and the contact part of the contact measuring head (1) and the coordinate plane is smaller than or equal to 1/1000 of the radius R of the contact measuring head (1);
step S200: an initial point and a comparison point which are far away from each other are respectively taken on a reference surface (2) of a reference block (3), and the contact type measuring head (1) cannot interfere with the reference block (3) when the initial point and the comparison point are measured;
step S300: measuring an initial point and a comparison point along the coordinate axis direction of a machine tool by using a contact measuring head (1), and recording the measured values of the two points in the coordinate axis direction;
step S400: calculating the difference between the initial point and the comparison point in the measuring direction, and if the difference is not 0, adjusting the position of the comparison point to reduce the distance between the comparison point and the initial point; if the difference is 0, adjusting the position of the comparison point to increase the distance between the comparison point and the initial point;
step S500: when increasing or decreasing the distance between the initial point and the comparison point, the initial adjustment distance of the comparison point is 1/2 of the distance between the initial point and the comparison point, the steps S300 and S400 are repeated, the adjustment distance of each comparison point is 1/2 of the adjustment distance of the last comparison point until the distance between the initial point and the comparison point is increased for the first time, or the distance change value of the comparison point in the measuring direction is less than 1 um; at this time, if the difference between the initial point and the comparison point is 0, the difference between the initial point and the comparison point at the last time in the measurement direction is not 0, which is the resolution of the machine tool measurement system.
3. The resolution measuring method of a machine tool measuring system according to claim 2, wherein in step S200, the initial point is close to the edge of the reference plane (2) and has a distance edge dimension smaller than the diameter D of the contact stylus (1) and larger than the radius R of the contact stylus (1) to ensure that the contact stylus (1) does not interfere with the reference block (3) when measuring the initial point and the comparison point.
4. The resolution measuring method of a machine tool measuring system according to claim 2, wherein in step S300, the contact probe (1) performs a measurement initiation point and a comparison point in a direction from an outer side of the measured reference plane (2) toward the reference plane (2).
5. The resolution measurement method of a machine tool measurement system according to any one of claims 1 to 4, wherein the reference block (3) has three mutually perpendicular planes, and the length, width and height dimensions of the three mutually perpendicular planes are: the length-width dimension is not less than 100mm x 100mm and not more than 200 x 200mm, and the height is not less than 20 mm.
6. The resolution measurement method of a machine tool measurement system according to claim 5, wherein the roughness of the datum plane (2) of the datum block (3) is less than Ra1.6.
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