basic dimension from profile?
basic dimension from profile?
(OP)
Hello,
I have an oddly shaped part, in which the outside shape is toleranced by a profile feature control frame. It references the primary, secondary, and tertiary datums (which are all perpendicular to each other) in the normal fashion. My question is this: I have surface at an angle which is perpendicular to the primary datum, but not parallel or perpendicular to any other datums. There are holes on this surface, but in the view normal showing these holes, there is nothing to dimension them from. Since the outside can be traced back to the original 3 datums (because of the profile feature control frame), can I legally place a basic dimension off of a point on this outside shape?
I have an oddly shaped part, in which the outside shape is toleranced by a profile feature control frame. It references the primary, secondary, and tertiary datums (which are all perpendicular to each other) in the normal fashion. My question is this: I have surface at an angle which is perpendicular to the primary datum, but not parallel or perpendicular to any other datums. There are holes on this surface, but in the view normal showing these holes, there is nothing to dimension them from. Since the outside can be traced back to the original 3 datums (because of the profile feature control frame), can I legally place a basic dimension off of a point on this outside shape?





RE: basic dimension from profile?
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: basic dimension from profile?
RE: basic dimension from profile?
RE: basic dimension from profile?
Supposing you added datum C to the position tolerance, then yes, the .962 would be OK since it could presumably be calculated back to datum C via the basic profile of the main outline.
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: basic dimension from profile?