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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
  • When I have features that have MMC,MMC,MMC I will tolerance the feature twice. one with use datums on and one without. This allows me to see if the part is in print according to the print with use datums on, and will also show me how much deviation that I have with use datums off. With use datums on PCDMIS will translate and rotate to simulate a hard gage fit which is the proper way to check it but will not tell you how much deviation that you have. Also when you use the use datums feature you must pick all 3 datums in the proper order.
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  • When I have features that have MMC,MMC,MMC I will tolerance the feature twice. one with use datums on and one without. This allows me to see if the part is in print according to the print with use datums on, and will also show me how much deviation that I have with use datums off. With use datums on PCDMIS will translate and rotate to simulate a hard gage fit which is the proper way to check it but will not tell you how much deviation that you have. Also when you use the use datums feature you must pick all 3 datums in the proper order.
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