Vision Offset Calibration Order

This was posted before by BuckB.. Very good Information please read below:



The question whether the fixture has moved will have two different results. Yes its moved will update the location of the calibration artifact whether the ring or sphere. No it hasn't moved will update the probe file from the last known location of the calibration artifact.

On a vision system always measure the ring first with vision and always say YES its moved. The vision probe is the Master that everything else is offset back to. This will locate the ring in the measurement range. Your vision probe should always have a TIP location of 0,0,#. If X and Y are not 0 then someone answered NO at some point.

Then choose a touch probe tip to be the secondary master. Measure TIP1 only on the Cal Sphere and answer YES. This will update the probe radius but will not update the probe location. Then calibrate the same tip on the ring gage and answer NO. This will update the probe location relative to the camera. If it is the first time you have ever measured the offset always use MAN+DCC. The manual hit is straight down about 5 mm from the inside diameter at 6 O'Clock. If you have done the offset before and know its close then you can run DCC.

Then if using multiple probes or star probes, go back to the cal sphere with the same TIP1 and answer YES its moved, this now updates the location of sphere with the corrected offset of TIP1 to the vision probe. All other tips can now be calibrated back to the cal sphere and answered NO like a normal CMM.

Hopefully this makes sense.

This was posted before by BuckB.. Very good Information please read below:



The question whether the fixture has moved will have two different results. Yes its moved will update the location of the calibration artifact whether the ring or sphere. No it hasn't moved will update the probe file from the last known location of the calibration artifact.

On a vision system always measure the ring first with vision and always say YES its moved. The vision probe is the Master that everything else is offset back to. This will locate the ring in the measurement range. Your vision probe should always have a TIP location of 0,0,#. If X and Y are not 0 then someone answered NO at some point.

Then choose a touch probe tip to be the secondary master. Measure TIP1 only on the Cal Sphere and answer YES. This will update the probe radius but will not update the probe location. Then calibrate the same tip on the ring gage and answer NO. This will update the probe location relative to the camera. If it is the first time you have ever measured the offset always use MAN+DCC. The manual hit is straight down about 5 mm from the inside diameter at 6 O'Clock. If you have done the offset before and know its close then you can run DCC.

Then if using multiple probes or star probes, go back to the cal sphere with the same TIP1 and answer YES its moved, this now updates the location of sphere with the corrected offset of TIP1 to the vision probe. All other tips can now be calibrated back to the cal sphere and answered NO like a normal CMM.

Hopefully this makes sense.