What is Datum Reference Frame?
Three perpendicular datum features that set the coordinate system for inspection.
A · B · C → X Y Z set
A datum reference frame establishes…
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In real work
Datum reference frame is A-B-C off the keel plane. CMM program must match or the report is scrap.
In the illustration
The plate drops flat onto the granite (A), slides against the long stop (B), then the end stop (C); three perpendicular axes spring out of the corner where they meet.
Set up the datum reference frame in your shop-floor software for the housing inspection: which three features are A, B and C, and the fixturing that locks them.
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