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Vision Offset Calibration Order

Eric Cai
I am using the Dual Z 443 with PC-DMIS 2013 MR1 SP6, and I am really confused with the Vision Offset Calibration Order.
Is it a must to calibrate the vision first then touch or is it ok to calibrate the touch first?

Once a while I check the vision-touch offset and the touch-touch offset, sometimes the vision-touch offset goes wrong, while
the touch-touch offset is ok, if i calibrate the vision-touch offset with the vision first, at this moment will the touch-touch offset
goes wrong? If so, will it be possible if I calibrate the touch first then vision to save time and make sure all the offset is good?
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  • If you're using a Vision CMM, then you want to Calibrate the Vision probe, and then cross calibrate the TTP to the Vision probe. NEVER the other way around.

    *the other way around is when you have a touch CMM with an add-on Vision probe, like the CMM-V*

    Afotion, you have given this latter procedure WHICH IS INCORRECT. Note that you are slave-calibrating your Vision and setting the master probe as the TTP. Cease this immediately!!

    Here is the procedure:

    - calibrate Vision Optics, Optical Center, and Illumination (may not be necessary) (result: Vision probe is cal'd)
    - calibrate the A0B0 TTP to the sphere. YES, sphere has moved. (may not be necessary) (result: TTP is cal'd, sphere position is reset in machine coordinates)
    - calibrate Vision Probe with the Ring Artifact. YES, the ring has moved (result: ring position is reset in machine coordinates relative to the probe)
    - calibrate TTP with the Ring Artifact. NO, the ring hasn't moved (result: probe position is reset in machine coordinates relative to the ring = probe offset is calc'd)

    NOW

    - recalibrate the TTP A0B0 master tip to the sphere! Since we have changed the "position" of the probe by changing the offset, the sphere "position" has moved. So YES, the sphere has moved. (result: sphere position is reset in machine coordinates relative to the newly offset TTP)

    - now calibrate any other tips. NO, the sphere hasn't moved, we locked it to the correct position previously.


    Cross calibration complete
Reply
  • If you're using a Vision CMM, then you want to Calibrate the Vision probe, and then cross calibrate the TTP to the Vision probe. NEVER the other way around.

    *the other way around is when you have a touch CMM with an add-on Vision probe, like the CMM-V*

    Afotion, you have given this latter procedure WHICH IS INCORRECT. Note that you are slave-calibrating your Vision and setting the master probe as the TTP. Cease this immediately!!

    Here is the procedure:

    - calibrate Vision Optics, Optical Center, and Illumination (may not be necessary) (result: Vision probe is cal'd)
    - calibrate the A0B0 TTP to the sphere. YES, sphere has moved. (may not be necessary) (result: TTP is cal'd, sphere position is reset in machine coordinates)
    - calibrate Vision Probe with the Ring Artifact. YES, the ring has moved (result: ring position is reset in machine coordinates relative to the probe)
    - calibrate TTP with the Ring Artifact. NO, the ring hasn't moved (result: probe position is reset in machine coordinates relative to the ring = probe offset is calc'd)

    NOW

    - recalibrate the TTP A0B0 master tip to the sphere! Since we have changed the "position" of the probe by changing the offset, the sphere "position" has moved. So YES, the sphere has moved. (result: sphere position is reset in machine coordinates relative to the newly offset TTP)

    - now calibrate any other tips. NO, the sphere hasn't moved, we locked it to the correct position previously.


    Cross calibration complete
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