[Ja...] Posted July 16, 2019 Share Posted July 16, 2019 I recently had a print that specified a surface as C, but nothing was being called back or referenced to it. I was informed this surface was intended to block the rotation (planar) of the part in the alignment. That being said, it was my understanding that your base alignment could be derived from whatever features you saw fit (notably the most repeatable features); and that the datums served only as references for measurements. Am I correct in that assumption? Or do Datums = Base Alignment? Link to comment https://qualityforum.zeiss.com/topic/18198-unused-datum-base-alignment/ Share on other sites More sharing options...
[Br...] Posted July 17, 2019 Share Posted July 17, 2019 Datums do nothing if they aren't referenced. https://youtu.be/S8eh4yxfEdk Link to comment https://qualityforum.zeiss.com/topic/18198-unused-datum-base-alignment/#findComment-102400 Share on other sites More sharing options...
[Ro...] Posted July 17, 2019 Share Posted July 17, 2019 life is hard enough without making up extra constraints. Link to comment https://qualityforum.zeiss.com/topic/18198-unused-datum-base-alignment/#findComment-102402 Share on other sites More sharing options...
[Ja...] Posted July 17, 2019 Author Share Posted July 17, 2019 Gentlemen, thank you both! I had thought I was on the right track. I've only been in the game a couple years now, and this forum is a wealth of knowledge. Link to comment https://qualityforum.zeiss.com/topic/18198-unused-datum-base-alignment/#findComment-102404 Share on other sites More sharing options...
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