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Parallelism vs Flatness

Parallelism vs Flatness

Parallelism vs Flatness

(OP)
I have two parallel surfaces. One surface is Datum A, the other surface is specified to be parallel to Datum A within 0.001 inches. Is it true that both faces are also guaranteed to be flat within 0.001 inches or do I need to specify flatness separately? See attached picture.

Thanks,
Ryan

RE: Parallelism vs Flatness

Top face will be parallel to -A- within .001, and hence flat to .001

You have no flatness indicated for the surface indicated -A-.  -A-  is simplistically derived from the 3 high points of the corresponding surface.

Almost the same question was recently asked over in the GD&T forum recently.

That is a better forum for this type of question.

forum1103: Drafting Standards, GD&T & Tolerance Analysis

 

KENAT, probably the least qualified checker you'll ever meet...

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