Ok. We have all seen this. A print with a centerline call out that really only controls size and not location. Think of this as solid block with a U shape cut thru it. The entire U shape is severely tipped to 1 side. We almost have a this wall condition on side. The U itself has perfect size and form. . We are getting push back from another dept saying according to the print it is good to go! There is a note saying all undefined geometry is controlled at +/- .010 on the print and we also use an internal control that states +/-.10 on all undefined dimensions. This dept has never heard of that document for some reason. So I would say the shape itself needs to be within .010 of the C/L. Can everyone out there quote a standard that talks about undefined symmetry ? Y14.5 has nothing ( and I didn't expect it to ) . The drawing isn't referencing any other specs and it is an internal drawing so this is more of a dept vs. dept P!$$!NG match. I would like to win this war with a MOAB !
No. Its a print for an Aluminum Extrusion DIE.. OK I take that back. There is a DATUM so you know which out side surfaces you are using to establish the C/L , ( the outside is stepped) but there isn't a FRC or anything else to verify the shape is actually on center other than out internal document about undefined Tol. being +/- .010 which the DIE shop seems to be making the claim they have never heard of.....
That's because everyone skips pages 1 and 2 in the GD&T book. That shows different books, more in detail, to relate to and nobody buys them, so they just start making up stuff and changing the rules to make bad parts good, or good parts bad.
That's because everyone skips pages 1 and 2 in the GD&T book. That shows different books, more in detail, to relate to and nobody buys them, so they just start making up stuff and changing the rules to make bad parts good, or good parts bad.
