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Fit To Datums

parrottk
Can someone give a good explination of the difference in true position when the fit to datums check box is on or off?
When I have the check box on all holes match nominals perfectly. (NO DVIATION AT ALL).
Check box turned off shows deviation that matches the actuals in the measured features.
when the check box is on the part looks to good and questions arise in regards to the accuracy of the gage and or the programer "ME".
thanks for the help.
Parents
  • Do I understand correctly?

    Did I understand you correctly Jan to say that "In V4.1, PC-DMIS allows you to actually put in the TP exactly as it is specified on the print."?

    Are you saying that 4.1 is the first in a long time where, if you used the Datums (-A-B-C-) to align the part, you can actually recall not only the MMC for the feature but also the MMC for the Datums (-B- & -C-) as well without it shifting and turning the part in a seemingly unpredictable attempt to show Datum / feature relationship?

    If not I am sadly disappointed because as we (in metal stamping) can agree, that is primarily all we need (in terms of this issue of course) to FULLY report diametrical features as the print describes.

    If so... Sign me up for 4.1!!!!
Reply
  • Do I understand correctly?

    Did I understand you correctly Jan to say that "In V4.1, PC-DMIS allows you to actually put in the TP exactly as it is specified on the print."?

    Are you saying that 4.1 is the first in a long time where, if you used the Datums (-A-B-C-) to align the part, you can actually recall not only the MMC for the feature but also the MMC for the Datums (-B- & -C-) as well without it shifting and turning the part in a seemingly unpredictable attempt to show Datum / feature relationship?

    If not I am sadly disappointed because as we (in metal stamping) can agree, that is primarily all we need (in terms of this issue of course) to FULLY report diametrical features as the print describes.

    If so... Sign me up for 4.1!!!!
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