[Da...] Posted Tuesday at 08:33 PM Share Posted Tuesday at 08:33 PM He doesn't get MMC on datum A, only on B and C. The datum structure is A|BM|CM. Link to comment Share on other sites More sharing options...
[Ma...] Posted Tuesday at 08:52 PM Share Posted Tuesday at 08:52 PM And that's what i did. Do you see that i posted "circle(M)"? After 1000 posts later there is a possible hint that he want TP on side holes and datums a holes from both +Z planes. How much easier it would be if there would be post with fully described picture. There is only mention about datum from A to F and only two planes are described. Don't blame me for not understanding this description: Please sign in to view this quote. Whats that E in both? I haven't seen drawing with two datums on single feature. Link to comment Share on other sites More sharing options...
[Da...] Posted yesterday at 09:52 PM Share Posted yesterday at 09:52 PM Please sign in to view this quote. No bonus tolerances on the holes; just MMC on thew datums. I see a lot of improper dimensioning from certain vendors, mostly from corporations which are mostly military suppliers and hire almost exclusively recent engineering grads. Some companies leave the interns/co-ops to dimension the prints. Link to comment Share on other sites More sharing options...
[Da...] Posted yesterday at 10:00 PM Share Posted yesterday at 10:00 PM Please sign in to view this quote. Well, I would've posted the entire print if it weren't for customer confidentiality. And, FWIW, having 2 different primary datums on a single part is fairly common for us when it's a sheetmetal assembly with 2 surfaces separated by a couple of brake forms. Only the datums of the second face are associated to the first face, then the rest of the second face's holes are dimensioned to it's own local structure. It's sheetmetal, but our customer treats it like it's a precision components machined from billet....... Link to comment Share on other sites More sharing options...
[Ma...] Posted 16 hours ago Share Posted 16 hours ago There is no need to post whole drawing, you can draw a sketch, where will be drawn datums and callouts ( dimensions are not required if there is no catch on them ). You got my point bad - i didn't mean part but feature. Why on earth you would place on one hole more than one datum? And i am not talking about datum on origin and another on pattern - i mean two datums on same place. I absolutely agree that you can have more callouts on single feature with diffrent datums ( aka [TP 1.0 | A | B(m) | C(m)] and [TP 1.0 | D | B(m) | C(m)] or [TP 1.0 | D | E(m) | F(m)] if those E and F are another features than B and C. You can draw into that image datums and TP callouts to let us see what are features for datums and what for callouts. Since you have two side holes it would be perfect to let us know if they are treated as pattern or not. Link to comment Share on other sites More sharing options...
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