Good Morning! I am still very new to PC-DMIS and I am having trouble with the Xact measurement of a true position callout for a feature. The callout for the hole should read TP/ Ø.005 @ MMC/ A @ MMC but when I try to dimension it, it does not allow me to pick the MMC modifier for Datum A. Datum A is the plane that the hole lies on and is also my Z zero. Do I need to somehow dimension Datum A? Is there a way to add this modifier?
Since no one has mentioned it, I will point out that in ASME GD&T, when the M in a circle symbol appears in the DRF (Datum Reference Frame) portion of the FCF (Feature Control Frame), it is NOT MMC but rather MMB. The same applies to the L in a circle. The difference between Maximum Material Condition and Maximum Material Boundary is significant. MMC adds to the allowed tolerance. MMB allows datum shift.
