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Adding Probe Angles AFTER Calibration Sphere has been moved

CarbideEVO
Good morning everyone,

After searching the forum (seems using google to do it gets better results!), I can't find a clear answer to this question that has been asked many times Confused Rolling eyes :

After calibrating A0B0, and additional angles - If I move the sphere, but discover I need additional angles, I would recalibrate all previous angles, and the new angles.

However, I read people saying this is unnecessary - as long as I recalibrate A0B0, and select "Yes, the sphere has moved" (because it has!), and measure the NEW angles..

that the previously calibrated angles and the newly added angles will all related to each other.

Is this true? Is this explained in the help file? What is the source of your information?

Thank you for your time!
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  • Is this true? Is this explained in the help file? What is the source of your information?



    1 : I would say that it's not totaly true...
    If you use a "master probe" to give the new location of the sphere, you will obtain nice results.
    I don't say "accurate" but "nice" :
    Offsets of a tip angle describe the vector between the actual tip and the tip which was used the last time that you said "yes, the sphere moved".
    If you move again the sphere, then you will use a new "master tip", and the new angles calibrated will define offsets from it.
    If you use the same "master tip / master probe", then the results should be accurate, except if you homed the cmm many times since the first sphere moved.

    2 : I don't know

    3 : here + some years of using / trying to understand.

    In addition, if you want a real accuracy, you should calibrate all angles at the same time.
    If you want a high accuracy, you should calibrate each tip with autocalibrate just between rotation and measure. It's very long, but it avoids uncertainty of re-positionning of the head.
Reply


  • Is this true? Is this explained in the help file? What is the source of your information?



    1 : I would say that it's not totaly true...
    If you use a "master probe" to give the new location of the sphere, you will obtain nice results.
    I don't say "accurate" but "nice" :
    Offsets of a tip angle describe the vector between the actual tip and the tip which was used the last time that you said "yes, the sphere moved".
    If you move again the sphere, then you will use a new "master tip", and the new angles calibrated will define offsets from it.
    If you use the same "master tip / master probe", then the results should be accurate, except if you homed the cmm many times since the first sphere moved.

    2 : I don't know

    3 : here + some years of using / trying to understand.

    In addition, if you want a real accuracy, you should calibrate all angles at the same time.
    If you want a high accuracy, you should calibrate each tip with autocalibrate just between rotation and measure. It's very long, but it avoids uncertainty of re-positionning of the head.
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