Perpendicularity

[jdmmech]

Hi there,

I have a drum that needs both faces of it perpendicular to the bore of the drum. I am wondering what the correct location of the feature control frame is so that both faces will have the tolerance. I am only assuming that putting the feature control frame pointing to one face means the other may not be be perpendicular too.

Would the newer "All around symbol" work for this?

Much appreciated.

 

[3DDave]

Just use two control frames, one for each end. Eliminates guessing.

All around refers to a continuous border and is used with the profile control.

 

[Belanger]

No to both of your direct questions. Assuming that the function of the part makes the bore the "driving" feature, then the diameter of the bore would be labeled as the datum feature (letter A or whatever) and then each face should have its own perpendicularity to datum A.
The size tolerance across the faces will keep them parallel to one another. If possible, you might want to post a sketch if you implement this idea and we'll all go from there

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems

 

[jdmmech]

Thanks guys. The diameter will be the datum and I will put 2 control frames on the drawing, 1 for each face. Thanks for the quick responses!