[Du...] Posted June 23 Share Posted June 23 I have this position callout on a drawing, its for a set of 8 holes, top section is in tolerance but the bottom section is out of tolerance, I can't seem to wrap my head around what the bottom section is actually controlling and what is out of tolerance. Link to comment https://qualityforum.zeiss.com/topic/26867-composite-true-position/ Share on other sites More sharing options...
[RP...] Posted June 23 Share Posted June 23 https://portal.zeiss.com/knowledge-base?id=410967 Link to comment https://qualityforum.zeiss.com/topic/26867-composite-true-position/#findComment-152063 Share on other sites More sharing options...
[Ch...] Posted June 23 Share Posted June 23 A few additional KBAs on the topic as well. CALYPSO: GD&T Engine: Simultaneous Requirements CALYPSO: GDT Position >< Direction Only Evaluation 1 Link to comment https://qualityforum.zeiss.com/topic/26867-composite-true-position/#findComment-152065 Share on other sites More sharing options...
[Ch...] Posted June 23 Share Posted June 23 Read thru ASME Y14.5-2018 starting on page 214. It has some good examples similar to this. Link to comment https://qualityforum.zeiss.com/topic/26867-composite-true-position/#findComment-152069 Share on other sites More sharing options...
[Be...] Posted June 23 Share Posted June 23 Let me give you a 1-dimensional example. Suppose that the callout is for the 1" and 2" tics on a ruler. Datum A is the face of the ruler that would touch the paper. Datum B is the end of the ruler. The upper control frame controls the distance of both tics from the end of the ruler. The lower control frame just controls the distance between the two tics. The 1" tic could be 1.5" from the end of the ruler and the 2" tic could be 2.5" from the end of the ruler. In that case they would fail the upper control but pass the lower control. 1 Link to comment https://qualityforum.zeiss.com/topic/26867-composite-true-position/#findComment-152073 Share on other sites More sharing options...
[Jo...] Posted June 24 Share Posted June 24 (edited) This feature must meet its positional tolerance relative to A|B-C|D to 0.020, while having a form of less than 0.005. Without a datum to reference, you can only consider form as you have nothing to "measure from" except yourself. Position, not profile. the below is correct. Edited June 24 Link to comment https://qualityforum.zeiss.com/topic/26867-composite-true-position/#findComment-152099 Share on other sites More sharing options...
[Ri...] Posted June 24 Share Posted June 24 Please sign in to view this quote. Please sign in to view this quote. Please sign in to view this quote. 2 Link to comment https://qualityforum.zeiss.com/topic/26867-composite-true-position/#findComment-152101 Share on other sites More sharing options...
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