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GD&T (Perpendicularity/Surface profile)

GD&T (Perpendicularity/Surface profile)

GD&T (Perpendicularity/Surface profile)

(OP)
Does it make sense to call out a perpendicularity and surface profile for the same feature w.r.t the same datum? Doesnt one serve to tighten/negate the other?

If my understanding is right, if I  have a 3d curved surface whose every point must be located within parallel planes (tolerance zone) to a datum, I would choose to use profile of a surface.

If however my surface is flat and perpendicular to a datum, I can choose to call out one or the other right?

Thanks in advance....

RE: GD&T (Perpendicularity/Surface profile)

You are correct about the flat surface, either would be acceptable on the drawing.

Reidh

RE: GD&T (Perpendicularity/Surface profile)

A question like this may be better in the Drafting Standards, GD&T & Tolerance Analysis forum forum1103

As to an answer, I believe there could be circumstances where it may be appropriate to put both.  For instance if you had a situation where perpendicularity to the datum was more important than the profile of the surface to itself.

RE: GD&T (Perpendicularity/Surface profile)

mechy20,

   A profile tolerance applied to a flat surface controls perpendicularity, among other things.  If your perpendicularity requirement is tighter than that of the profile tolerance, then you need a perpendularity tolerance as well.

   Check out the GD&T forum.

                     JHG

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