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MMC pin size for target fixture

MMC pin size for target fixture

MMC pin size for target fixture

(OP)
While certifying MMC pins I noticed some differences to what I've always used as a formula to calculate the size of an MMC pin.  I learned take the minimum hole size allowed then just subtract the positional tolerance.

Like this: Diameter 4.5 +/-.25  TP 1.50m [-A-][-B-][-C-] would have a pin size 4.5 - .25 = 4.25 - 1.50 = 2.75

Does anyone have more info?  

RE: MMC pin size for target fixture

Although the positional tolerances appear a bit heavy, you are correct in your math for the nominal pin size.

Do NOT think that all tool shops know GD & T, they don't. I think I would give them a call on this one.

Dave D.
www.qmsi.ca

RE: MMC pin size for target fixture

Yes your math is correct. Your pin size is equal to VC (Virtual Condition).

Sunil

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