Compound Profile Tolerance with Tighter Upper Control?

[LargeNCharge86]

I'm having a serious brain fart on this one. I have a straight tube with two dimples in it that need to be controlled with a profile. Datum A is one end of the tube, datum B is the CL of the tube.

I need to hold them to a profile of 0.5mm to datum B and 2mm to datum A, but for some reason I'm having a hard time converting that into a callout since a compound profile requires the upper half (the control to A AND B) to be a larger number than the lower (which in this case would be just datum A).

For some reason putting the top to A & B and the bottom just to B doesnt seem right to me.

Any suggestions on what this callout should look like?

 

[LynnB1]

Can you switch your datum order? B|A in the top half and B in the bottom half

 

[Belanger]

If it's as you describe, then you wouldn't need to mention B in the upper frame.
Also keep in mind that there's a difference between having one profile symbol centered between the two callouts vs. having two separate profile symbols. The first goes by the name composite profile and the second is just two separate, unrelated profiles. It sounds like you want the latter, and in that case there's no requirement that the upper tolerance be larger than the lower tolerance.

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