[Da...] Posted August 14, 2019 Share Posted August 14, 2019 So I have a drawing with an angularity callout to two (ignore the C) datums. See the attachment. Both A and B are planes. The result for an angularity to A or B separately is good. Like .01 mm for either. But as soon as I throw the second datum in, my results go way off. It is claiming a result of 36.8mm. Is there anything special with angularity to two datums I am missing?Angle2.PNGAngle.PNG Link to comment https://qualityforum.zeiss.com/topic/18000-angularity-to-two-datums/ Share on other sites More sharing options...
[Me...] Posted August 14, 2019 Share Posted August 14, 2019 You may need to create an alignment that puts your geometry in the correct orientation relative to the datum constraints and check form only on the feature. Not sure how well Calypso handle's multiple datum features and angularity. Robert Link to comment https://qualityforum.zeiss.com/topic/18000-angularity-to-two-datums/#findComment-101158 Share on other sites More sharing options...
[Ri...] Posted August 14, 2019 Share Posted August 14, 2019 Please sign in to view this quote. Yeah - Profile is probably a better measurement. Check your nominals and make sure everything is correct. The second datum is supposed to be used as a refinement for direction. Are the two datums Perpendicular to one another? Link to comment https://qualityforum.zeiss.com/topic/18000-angularity-to-two-datums/#findComment-101160 Share on other sites More sharing options...
[Da...] Posted August 14, 2019 Author Share Posted August 14, 2019 Please sign in to view this quote. The datums are perpendicular. The top and one side of a box. The angled surface is a angled to both datums. Isn't profile a more strict requirement? Angularity controls orientation of the surface, not location. In this case, it happens to pass profile to the same tolerance, but not by much. The surface has a profile of 0.045 mm to the datums, but Calypso claims angularity is like 35 mm. Does calypso have a bug in its calculation for angularity to two datums? Link to comment https://qualityforum.zeiss.com/topic/18000-angularity-to-two-datums/#findComment-101162 Share on other sites More sharing options...
[Me...] Posted August 14, 2019 Share Posted August 14, 2019 One way to do it... If you use an alignment that mimics the datum constraints and report profile as Min/Max you can use a result element to find the difference between the Min/Max to get your angularity result. Robert Link to comment https://qualityforum.zeiss.com/topic/18000-angularity-to-two-datums/#findComment-101164 Share on other sites More sharing options...
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