Profile of a surface applied to surface containing a datum target.

[autoengineer79]

Hello all.
I have a call-out that I want to confirm as being legal. I have a part with a pin through a planar face. The face is datum feature A, the pin diameter is datum feature B, the last degree of freedom is removed by a point stop (datum target C) on a surface perpendicular to A.

Can I use a profile of a surface to control the form and orientation of the rest of that surface that the C target is located on relative to A, B & C? Flatness will be refined later.

See attached picture and disregard the lack of B to A control and identification of c target location.
The url shows up for the picture, but I don't see it in the preview, so I hope it makes it.
I Figure the check is a set of feeler gauges to check between the surface of the part and a pad on the fixture.

Best regards

 

[pmarc]

You should use profile of surface to control orientation and location of face relative to A & B.

Datum target point is a point on this face. Its purpose is to constrain last rotational degree of freedom of the part. Assuming there is no general angular tolerance in a print title block, no profile tolerance means that nothing limits orientation and location of the face and in consequence nothing governs a position of that datum target point. This in turn can cause that the part will not be oriented in a repeatable way for measurements.

 

[autoengineer79]

Thanks,

That's actually what I ended up going with.