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Stop Using Datum Shift as a Bonus! (#274)

(In accordance with the ASME Y14.5-2009 standard)

PDF is Available with GD&T Reference Center Subscription.

I have created several Tips on this subject because it is one of the most confusing topics in GD&T.  Many folks wrongly treat datum shift as an additional bonus tolerance.

On this drawing, in the position tolerance feature control frames, datum feature B and C are modified with the MMC symbol.  This means there is an allowable shift …

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Back to Tips Tip added Nov 2012