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Calibrating after homing

Jay_Q
Is it correct that after the machine is re-homed, you only need to re calibrate the “master” tip at 0,0 saying “yes” the tool has moved? All of the other tips do not need to be done because they will relate back to the previous position. Homing should be the same as just moving the cal sphere to a different location right?
  • You don't even need to do that as a matter of course, you only need to recalibrate it if you need to calibrate some other probes/tip angles.
  • Maybe this simple question is not as simple that it seems...
    Homing the machine between to calibrations just add a offset to the second tip calibration from the first.
    If you have to home the cmm while a part is on the granite, you can imagine that the part and the sphere move of the same distances from zero, so calibrate tips without saying "yes" should work as well and keep the accuracy... It allows to continue the measurement without re-run the part from the start (IMO)...
    I think auto-calibration is also made for it...
  • Maybe this simple question is not as simple that it seems...
    Homing the machine between to calibrations just add a offset to the second tip calibration from the first.
    If you have to home the cmm while a part is on the granite, you can imagine that the part and the sphere move of the same distances from zero, so calibrate tips without saying "yes" should work as well and keep the accuracy... It allows to continue the measurement without re-run the part from the start (IMO)...
    I think auto-calibration is also made for it...

    This should work if you calibrate all the tips at the same time. If after a new machine homing, a single tip is calibrated without the master having calibrated with the YES option, then it will carry over this offset. Imo it is good practice to just calibrate the master only with YES after the restart of a machine. Please correct me if I am wrong Slight smile
  • In the absolute, you're right, my example was only for a long process of measurement, if you have to home during the prog (for a bad reason like a bug or a breakdown)
    Homing is a real problem with rotary center... Calibrating a rotary is long, and it must be done after a homing...
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