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Calibration plate calibration...

pab39
Hi,

We have an Optiv 321GL-TP, and since the beginning we are calibrating probes every week, but also the camera with the glass plate (you know, the one with rectangles and circles).
For the probes i'm pretty sure it's necessary, but what about the camera ? how often do you check it guys ?
This give rise to another question: does the calibration features (sphere/ring and glass plate) has to be verified periodically ?

Thanks.
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  • I think calibrating optics is not necessary as often as calibrating tips, but you should calibrate offsets between optic and ttp at each calibration of one of them (if you use both of them).
    For the calibration of artifacts, I think it's not necessary, if you can check them by comparison (calibrate on the sphere and measure the ring, and calibrate on another sphere and measure the sphere).
    The problem of re-calibration of a calibration sphere is that the measured deviation is often less than the uncertainty of calibration, so you change the diameter of an "uncertain" value.
    Checking spheres by comparison is enough on most of cmms. Maybe it's not the case for very accurate ones...
    For those different points, it's just my opinion !
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  • I think calibrating optics is not necessary as often as calibrating tips, but you should calibrate offsets between optic and ttp at each calibration of one of them (if you use both of them).
    For the calibration of artifacts, I think it's not necessary, if you can check them by comparison (calibrate on the sphere and measure the ring, and calibrate on another sphere and measure the sphere).
    The problem of re-calibration of a calibration sphere is that the measured deviation is often less than the uncertainty of calibration, so you change the diameter of an "uncertain" value.
    Checking spheres by comparison is enough on most of cmms. Maybe it's not the case for very accurate ones...
    For those different points, it's just my opinion !
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