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Profile Tolerance on a Datum

Loon4ever
We are having a disagreement here where I work. The older inspector is of the opinion that a Datum CANNOT have a profile tolerance. The rest of us have never heard of this and even have numerous examples of customer prints where they have Datums with profile tolerances. The custoer isn't always right however.

I understand his reasoning, Datums are "Zero" and such can't/shouldn't deviate, but I also understand that this isn't a perfect world where Datums can't deviate. So personally I believe that there is nothing wrong with giving a datum a profile.

Can anyone point me to a specific document, Preferably the ASME Y14.5 spec that says that Datums can't be given a profile tolerance?

Thanks in advance.
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  • The "older inspector" confuses the real surface and the associated datum on it.
    If he is older enough, he confuses the granite surface where you put the part to simulate the datum !!!
    The granite was considered as a perfect plane, the datum was tangent to the surface, external side of the material, and minimizing more or less the max deviation...
    However, the surface of the part on the granit had defects... non measurable at this step Slight smile !
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  • The "older inspector" confuses the real surface and the associated datum on it.
    If he is older enough, he confuses the granite surface where you put the part to simulate the datum !!!
    The granite was considered as a perfect plane, the datum was tangent to the surface, external side of the material, and minimizing more or less the max deviation...
    However, the surface of the part on the granit had defects... non measurable at this step Slight smile !
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