Factors Affecting The Normal Operation Of The CMM

- Aug 09, 2018-

3. Correctness and accuracy of three-coordinate probe calibration


When the probe is inspected, the unqualified check ball and stylus are not secure, and the wrong stylus length and standard ball diameter are input, so that the compensation error or error occurs when the software calls the probe compensation file during measurement, which affects the measurement accuracy. Incorrect stylus length and standard ball diameter will cause compensation error or error when the software calls the probe compensation file during measurement, which will affect the measurement accuracy and even cause abnormal collision of the device and cause damage.


Solution and requirements


(1) Keep the standard ball and stylus clean.

(2) Ensure that the measuring head, the probe, the stylus and the standard ball are firmly fixed.

(3) Enter the correct stylus length and standard ball diameter.

(4) According to the shape error and the corrected diameter and repeatability of the gem ball, the accuracy of the correction is judged (the length of the gem ball after the length of the lengthened rod is different).

(5) When using different probe positions, after correcting all the probe positions, check the calibration accuracy by measuring the coordinates of the standard ball center point.

(6) The probe should be re-calibrated in the case of the probe, the stylus movement and the high measurement accuracy requirements.


4. The shape error of the tested part and the correct choice of the reference


(1) When the measured part has obvious burrs or trachoma, the repeatability of the measurement is significantly deteriorated, so that the operator cannot give accurate measurement results.

(2) The selection of an incorrect measurement reference will cause errors in measurement and calculation results.


Solution and requirements


Choose the correct measurement baseline.