Control Frames
Control Frames
(OP)
Can someone explain what the differeces are between the two examples in the attachment?
I'm being told that there are no differences.
Also being told that the projection callout is incorrectly applied.
I'm being told that there are no differences.
Also being told that the projection callout is incorrectly applied.





RE: Control Frames
Projected tolerance zone height is applied incorrectly only because there is a line separating P modifier and .070 value. It should not be there.
RE: Control Frames
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
http://www.gdtseminars.com
RE: Control Frames
Since there shouldn't be a line between the P and the .070 should there be a line between the .001 and the P?
RE: Control Frames
No line before, no line after.
Also, as projection tolerance essentially applies to part of the fastener (or gage) protruding above the surface of the part, you may consider using (M) modifier with .001 tolerance as well.
RE: Control Frames
I should have mentioned that at the very beginning of my reply.