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GD&T tolerance

GD&T tolerance

GD&T tolerance


I haven't used Geometric tolerances for a while, so I just wanted to double check I'm not going insane

I stumbled across a drawing (see attached / or below post), and I'm pretty sure the geometric tolerancing is wrong.

1) The parallelism looks to be on a wrong face?

2) Also, personally I would have thought it would have been better to datum A the external of cylinder and put a concentricity on the internal, rather than a perpendicular?


RE: GD&T tolerance


RE: GD&T tolerance

You might get some better answers if you post this in the Drafting and GD&T forum:


That being said, I see no problem with where the 'A' datum has been established nor the use of the parallelism constraint. True, it would seem that there is a missing concentricity constraint, perhaps even two, as the bottom of the groove needs to be constrained as well, plus the walls should be parallel to the 'A' datum as well, but then we have to assume that there are default tolerances, in which case, the only tolerances needed on the drawing are those which are either more or less precise than what the defaults standards would indicate.

John R. Baker, P.E. (ret)
Irvine, CA
Siemens PLM:

The secret of life is not finding someone to live with
It's finding someone you can't live without

RE: GD&T tolerance

Thanks. Moved to the other forum, can close this one now

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