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Calculating additional tolerance permitted when a position tolerance is modified at MMC. (#3)

(In accordance with Y14.5M-1994 standard)

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An additional tolerance, often called Bonus Tolerance, is permitted when a position tolerance is modified at maximum material condition (MMC) and the actual mating envelope of the feature has departed from the MMC. [Y14.5M-1994 Para. 1.3.11 &]

In these illustrations, the part is black and the actual mating envelope is red.

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Back to Tips Tip added Aug 1997