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Unilateral Surface Profile in 2023 coming from 2017

lovethepirk
We are in the middle of updating programs to 2023.

In 2017, we see a measured value of 0.000 when we enter "PROFILE 0.03 | U | 0.03 |ABC" in xactmeasure when we run it offline.

In 2023, we see a measured value of -0.015 when we enter ""PROFILE 0.03 | U | 0.03 |ABC" in geotol when ran offline.


I assume in 2023, the software is making sort of a midline profile surface 0.015 away from the part, so that when we run it offline and it hits the CAD model the hits are recessed from the 'fake profile midline" so we magically get a negative number for an offline nominal.

Am I understanding this correctly?
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  • Good discussion thanks for the help...

    Can someone tell me if my assumption was correct...is PCDMIS coming up with an imaginary mid-surface and reporting negative for an offline run do to this????
  • in reply to lovethepirk
    It's explained in the document I linked to.

    All deviations come from the centre of the tolerance zone so yes, if you are offline, have generated your scan from the CAD surface and have a U value of 1 with a tolerance of 1 (so only +material allowed), your points will all sit exactly on the lower tolerance boundary. Because the deviations come from the centre of the zone, all deviations will be -0.5.and the measured value will be 1 (twice the largest deviation).
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  • in reply to lovethepirk
    It's explained in the document I linked to.

    All deviations come from the centre of the tolerance zone so yes, if you are offline, have generated your scan from the CAD surface and have a U value of 1 with a tolerance of 1 (so only +material allowed), your points will all sit exactly on the lower tolerance boundary. Because the deviations come from the centre of the zone, all deviations will be -0.5.and the measured value will be 1 (twice the largest deviation).
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