[Ja...] Posted July 20 Share Posted July 20 I’m still having trouble with bolt circles in the new GD&T. For items 6 & 26, the new engine will let me select -A- and -B-, but I can only select -C- after I’ve basically made a simple circle using the bolt holes (it’s not going to clock to a best fit). When I select common datum, all of the features disappear except for -A- & -B-. Is there any way to do this staying completely in the new engine, or am I stuck trying to adapt part of the old way? Link to comment https://qualityforum.zeiss.com/topic/27051-new-gdt-orientation/ Share on other sites More sharing options...
[Iv...] Posted July 20 Share Posted July 20 To use the Common Datum option, the feature must be plane or cylinder. Try creating the Datum C holes as cylinders instead of circles. 2 Link to comment https://qualityforum.zeiss.com/topic/27051-new-gdt-orientation/#findComment-153133 Share on other sites More sharing options...
[Ja...] Posted July 21 Author Share Posted July 21 Thanks. That did the trick. However I'm not understanding the logic Zeiss used requiring cylinders rather than circles. Link to comment https://qualityforum.zeiss.com/topic/27051-new-gdt-orientation/#findComment-153155 Share on other sites More sharing options...
[Iv...] Posted July 21 Share Posted July 21 Please sign in to view this username. Completely agree and happy to help! The common datum is a great addition, but there are some current limitations that I'm hoping will be addressed in the near future. I had a similar part, but instead of holes, the bolt pattern was symmetry planes. Despite the common datum option allowing planes, it was unhappy about the symmetry planes and did not compute an answer. I had to use the legacy method for this. Link to comment https://qualityforum.zeiss.com/topic/27051-new-gdt-orientation/#findComment-153171 Share on other sites More sharing options...
[Ri...] Posted July 21 Share Posted July 21 Please sign in to view this username. I haven't ran into a particular case of common symmetry planes, but a workaround you could do would be to create the position of each symmetry plane (to say your A B DRF), set it to a SIMREQ, then go to Resources - Utilities - GDT Best-Fit - Select one of the Positions, now you can use that Alignment as your A B C alignment. I've done this for complicated DRFs, and it works wonders. 🙂 3 Link to comment https://qualityforum.zeiss.com/topic/27051-new-gdt-orientation/#findComment-153173 Share on other sites More sharing options...
[Iv...] Posted July 21 Share Posted July 21 Please sign in to view this username. Love that! Thank you so much for that tip. I'm eagerly waiting for the next opportunity I get to try that out 🤓 1 Link to comment https://qualityforum.zeiss.com/topic/27051-new-gdt-orientation/#findComment-153175 Share on other sites More sharing options...
[Ch...] Posted July 21 Share Posted July 21 Please sign in to view this quote. same here. Another thing I did with the old GDT was make a theoretical 3d line for the best fit bolt pattern (or pattern of features) that is nominal 0 to the best fit, then in position characteristic report to A|B + Theo line -C- for example .. same difference. Ive used both ways. 1 Link to comment https://qualityforum.zeiss.com/topic/27051-new-gdt-orientation/#findComment-153181 Share on other sites More sharing options...
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