What problems should be paid attention to when calibrating the stylus of the coordinate measuring machine?

What problems should be paid attention to when calibrating the stylus of the coordinate measuring machine? Published: 2019-11-27 Source: https://www.microaccuracy.com/ The three-coordinate measuring machine adopts a contact measurement method, and the stylus is the part of the measuring device that directly contacts the part. It is used in order to reduce the error. It needs to be calibrated before, so what issues should be paid attention to when calibrating the stylus of the CMM? The stylus is an important factor that affects the measurement accuracy of the coordinate measuring machine. The selection and correct use of the stylus will cause errors. The stylus is installed on the probe, and it is connected to the probe’s communication to trigger the signal. Generally, it is recommended to choose a stylus with the largest possible stylus diameter and the shortest stylus rod, so that the best effective working length can be obtained. Need to pay attention to the following factors in the calibration of the stylus: 1. The stylus, stylus (sensor), extension rod, stylus, and standard ball must be installed reliably, firmly and not loosely. The stylus, probe (sensor), extension rod, There must be no gaps in the stylus. After checking whether the stylus and standard ball installed in the coordinate measuring machine are firm, wipe the fingerprints and dust on the stylus and standard ball, and keep the stylus and standard ball clean at all times. 2. When calibrating the stylus, the measuring speed should be the same as the speed when measuring parts. Pay attention to the diameter of the stylus after calibration (whether there is a large deviation from the previous calibration result when the same configuration is used) and the shape error during calibration. If there is a large calibration change, find the cause or clean the standard ball and stylus. Repeat 3 to 4 times of calibration, observe the repeated data of the calibration results, check whether the probe, stylus, and standard ball are firmly installed, and also check the working status of the CMM. 3. When multiple stylus angles, positions and different stylus lengths are required to be calibrated, the calibration effect must be checked after the calibration. The method is: after all the defined styli calibrations, use the test standard Ball function, use all the styli after calibration to measure the standard ball according to this, observe the measurement change of the sphere center coordinate, if there is a change of 1 to 3 microns, it is normal, if the change is relatively large, you need to check the measurement again. Whether the mount, probe, extension rod, stylus, and standard ball are firmly installed, fingerprints and dust on the stylus and standard ball are also important reasons for this phenomenon. 4. Pay attention to replace the appropriate stylus, because the length of the stylus is an important parameter for the automatic calibration of the stylus. If there is an error, it will cause an abnormal collision of the stylus, the lighter one will damage the stylus, and the heavy one will cause the stylus (sensor )damage. 5. Input the actual diameter of the standard ball correctly. The diameter of the standard ball directly affects the calibration value of the diameter of the styli gem ball. Although this is a small probability event, it also requires attention for first-time users. The above are the matters needing attention when calibrating the stylus of the coordinate measuring machine. You need to confirm that the calibration is correct and start the measurement. This can reduce the measurement error. If the calibration diameter of the stylus after calibration is less than the nominal value, this will not affect the three For the measurement accuracy of the coordinate measuring machine, Miaoji Technology can provide a variety of coordinate measuring machines, one-button measuring instruments and other equipment at a discount!