Profile on Coplanar Surfaces
Profile on Coplanar Surfaces
(OP)
Would it be acceptable to use Profile on coplanar surfaces with respect to a datum surface that is perpendicular? Basically treating that profile tolerance like perpendicularity to those surfaces. I've seen it done with basic profile but wasn't sure about it when applied to coplanar surfaces. Thanks in advance.





RE: Profile on Coplanar Surfaces
I'm wondering if this would be a case where you have 2 controls. Surface profile for the coplanarity and then a separate perpendicularity. Unless of course the value on both is the same, in which case it seems logical to reference the datum but I'm not sure the standard explicitly covers this case.
Good question.
KENAT,
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RE: Profile on Coplanar Surfaces
RE: Profile on Coplanar Surfaces
You are using it like normal surface profile and get the coplanarity out from the control of surface profile over location & orientation.
KENAT,
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RE: Profile on Coplanar Surfaces
The combination of 2 controls that KENAT mentioned would give a similar overall result, but not exactly the same. Applying a Perpendicularity tolerance to the 2 surfaces would control them individually - there would be 2 zones that are both exactly perpendicular to the datum but not coplanar to each other. The Surface Profile tolerance would control the coplanarity. Again, this combination is not exactly the same as the Surface Profile with the datum reference.
It sounds like the control that you want is the equivalent of "regular" Perpendicularity, except applied to a pair of 2 surfaces that act as one interrupted surface. I would go with the Surface Profile with the datum reference.
Evan Janeshewski
Axymetrix Quality Engineering Inc.
www.axymetrix.ca
RE: Profile on Coplanar Surfaces