Company Standards - misapplication of GD&T?
My company has for years used drawings with a general symmetrical tolerance block and applied GD&T as necessary, to very good success. However, we're recently been pushed by our parent company to adopt their standards. This includes a general note calling all untoleranced dimensions basic, which I know is OK per standards. However, the general drawing notes also contain feature control frames for both profile and position. The values are part dependent, but generally the profile allows a larger variation than the position. And there are normally very few specific tolerances called out on their prints. One of my problems comes in the interpretation of what's profile vs. position. A dimension to a hole is obviously position, but to the edge of a slot? Or a cutout in a piece of sheet metal. Dimension to the first edge of the cutout, profile or position? First edge to second edge? Hole diameters would seemingly all be profile? Not only am I confused, but I'm getting completely inconsistent inspection reports; dimensions are almost always interpreted using all profile or all position. This morning I got report on a sheet metal part where all the bends (indeed all the dimensions) where inspected using the profile tolerance, which seems a misapplication. I've used basic GDT for years, but I don't consider myself an expert. Does this seem reasonable? Am I misinterpreting something? I'm having some consternation both trying to follow the "standards" and producing a print that I believe is acceptable.
Thanks,
Dave