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....
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)
Reidh
RE: GD&T (Perpendicularity/Surface profile)
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)
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