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Zero Position - No Material Modifier - Sortof

CFisher
Is this a 'legal' callout? We have 4 holes thru the face of a cylindrical part. You know the drill - I can't include the actual print. If need be, I can mock something up.
Datum A = OD, Datum B = Top plane of cylinder, Datum C = 1 of the 4 holes. Should there not be a material modifier here on the position tolerance itself?? Or is the effect the same b/c Datum C is one of the 4 holes?

I'll contact our customer...but they won't likely respond for a month or two...

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  • There should be a (M) on the positional tolerance, regardless if it is a single hole or a group of holes.

    Theoretically, there could be a small possibility that the part could fall within specification depending on the datum C (M) and the rest of the datum structure (and planets are aligned, sun at it's zenith and so on).
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  • There should be a (M) on the positional tolerance, regardless if it is a single hole or a group of holes.

    Theoretically, there could be a small possibility that the part could fall within specification depending on the datum C (M) and the rest of the datum structure (and planets are aligned, sun at it's zenith and so on).
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