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MMB on tolerances other than position and orientation

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Burunduk

Mechanical
May 2, 2019
2,533
Per ASME Y14.5-2009, do you consider it acceptable to apply datum features MMB (to allow datum shift) for profile or runout controls? (As a side note - I do realize that for runout, allowing datum shift seems to make little sense functionally but I've seen parts being inspected for runout on a fixed size gauge with small clearance on the diameter, without any negative consequences). Looking briefly through the figures, haven't found an example of MMB for the profile or runout cases.
 
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Runout - absolutely NO.

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Profile - no problem:

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"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
 
CH, thanks a lot!
Both points (MMB for runout and profile) got clarified.
 
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