How to calibrate the probe stylus of a coordinate measuring machine?

How to calibrate the probe stylus of a coordinate measuring machine? Published: 2019-09-11 Source: http://www.microaccuracy.com/ The accuracy of the probe diameter will directly affect the accuracy of the CMM, so calibration must be performed before the CMM is used. To avoid errors in subsequent measurements, how to calibrate the probe and stylus of the CMM? The probe calibration process before the use of the coordinate measuring machine: ①The probe needs to be defined before the probe calibration. According to the measurement software requirements, select the probe seat, probe, extension rod, stylus, standard ball diameter, etc., and at the same time Define the probe numbers that can distinguish different angles, positions or lengths. ②The replacement of the probe needs to be reset in the measurement software. The settings of the three-coordinate probe, probe, extension rod, and stylus in the software are correct; the use position of the probe and the diameter of the standard ball are entered correctly, and the probe correction speed setting is consistent with the measurement. ③Single probe position correction, pay attention to observe the diameter and standard deviation of the stylus of the coordinate measuring machine. The diameter of the stylus of the coordinate measuring machine should be similar to the usual calibration with good repeatability, and the standard deviation should be as small as possible. , The diameter is small, the deviation is large). ④When multiple three-coordinate probe positions are corrected, in addition to observing the above results, it is also necessary to use the corrected positions of each three-coordinate probe to measure the standard sphere and observe the change of the center coordinate value. The error is similar. ⑤ Use manual, joystick, and automatic methods to touch more than 5 points within the maximum range of the standard ball (generally recommended between 7 and 11 points), and the points should be evenly distributed. ⑥After receiving these points (the X, Y, Z values u200bu200bof the center coordinates of the gem ball), the computer software performs the ball fitting calculation to obtain the ball center coordinates, diameter and shape errors of the fitted ball. Subtracting the diameter of the fitting ball from the diameter of the standard ball, the 'diameter' of the jewel ball after correction (to be exact, it should be the 'correction value' or 'correction diameter'). The above is the CMM’s probe calibration process shared by MiaoJi. Doing a good job of calibration before measurement can reduce errors in the subsequent measurement process and effectively improve the detection accuracy of the CMM. At present, MiaoJi can provide various The industry provides high-quality three-coordinate measuring machines and one-button measuring instruments to meet the high-precision measurement needs in different fields!