Thanks Jim,
You said...
The ACTUAL position (i.e. the axis) of the feature (hole) needs to be within the tolerance zone centered at the BASIC location.
To reject the part based on that, does inspection scribe a circle the size of the zone on the part exactly at the BASIC dim value and compare...
Thanks. I think I get the circumscribed square concept wrt tol zone.
But what accurately places the tol zone?? It's nice to say that such and such should be inside the zone, but unless you know where the zone is, what good is it all?
I guess I don't get how the dimension to a datum of the true...
I'm not saying that it controls the position of an axis. But that the axis lies inside the zone.
How would you modify my statement to make it true? That would surely assist me.
Thanks
Are my assumptions correct below? I'm new to GD&T:
Positional tolerance frames specifies a 3 dimensional zone concentric with the true position axis, inside which, the real manufactured hole's axis must lie for the part to meet the specifications.
The true position axis uses three basic...
