MMC bonus

I am dimensioning true position of a few holes, the diameters are out of tolerance (to big) so should they still benefit from the MMC and gain that Bonus tolerance?

or do they not receive bonus since the diameter is out of tolerance?

I've seen a few situations where the diameters are to big but still receive the full bonus, and situation where the diameter is to big and not receive any bonus.

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VinniUSMC over 7 years ago

I think that might be a bit debatable.

The feature is non-conforming for size. It certainly is 0.3 departed from MMC and, by it's size tolerance, can receive up to 0.2 bonus tolerance. The question becomes, does a non-conforming feature still allow for MMC? And I'm not entirely sure that there is a definite answer.

It probably depends on the function of the feature. If the part could still function, then applying the MMC should be ok. If the part would no longer function, then what's the point of worrying about MMC?

Finally, if you're worrying about 0.2mm of bonus tolerance, when you're already using up 2.0mm of tolerance, surely the concern should be, "why is this hole oversized and off location?" instead of, "can I get 0.2mm of extra tolerance for a hole that is basically completely nonconforming?" IMHO.
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PacMan23 over 7 years ago in reply to VinniUSMC

this is true
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PacMan23 over 7 years ago in reply to VinniUSMC

this is true
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