GD&T Datum/FCF Question
I was studying up on some GD&T and came across this example:
I think I'm realizing I didn't fully understand FCFs... As I understood, the datums assigned to the FCF is the datums which are "touching"/"secured" during measurement. In this example, how would the position of the holes (assigned to datum B) be located while only touching the top face (assigned as datum A)? To purposefully exaggerate the idea, wouldn't the CMM just nudge our part since there is nothing constraining XY movement?
Posted Jul 9, 2026, 7:44 PM UTC
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