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Calculating additional tolerance permitted when a position tolerance is modified at MMC
(In accordance with Y14.5M-1994 standard)

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Revised to be in accordance with the ASME Y14.5-2009 Standard

Position and orientation tolerances, such as this perpendicularity tolerance, that are associated with the size dimension apply to the axis of the Unrelated Actual Mating Envelope (UAME).

Where an MMC modifier is applied to one of these tolerances, any available bonus tolerance is the difference between the MMC size and the size of the UAME.

The position tolerance applies to the axis of the Unrelated Actual Mating Envelope (UAME). Because datum feature B is a secondary datum feature that applies RFS, the datum feature simulator is the Related Actual Mating Envelope (RAME).

Back to Tips Tip added Aug 1997