[Cl...] Posted June 9, 2021 Share Posted June 9, 2021 ABC.pdf Link to comment https://qualityforum.zeiss.com/topic/12736-datum-precidence/ Share on other sites More sharing options...
[SH...] Posted June 9, 2021 Share Posted June 9, 2021 Datum feature simulater of datum B might not constrain rotational degrees of freedom, it depends upon on how the part function. Link to comment https://qualityforum.zeiss.com/topic/12736-datum-precidence/#findComment-64034 Share on other sites More sharing options...
[Ma...] Posted June 9, 2021 Share Posted June 9, 2021 As I see it: A.B.C would have origins at A and B and planar from C A.C.B would have origins at A,B, and C and planar from C Tolerances ideally should reflect the function of the datum surfaces, but we don't have this information Link to comment https://qualityforum.zeiss.com/topic/12736-datum-precidence/#findComment-64036 Share on other sites More sharing options...
[Cl...] Posted June 9, 2021 Author Share Posted June 9, 2021 This is simply a hand held instrument. The finished product has 3 spheres attached to (D1, D2, D3). These spheres are picked up by a camera system used by a robot for targeting were to cut or drill. Link to comment https://qualityforum.zeiss.com/topic/12736-datum-precidence/#findComment-64038 Share on other sites More sharing options...
[Ri...] Posted June 9, 2021 Share Posted June 9, 2021 Designers need to start explaining what they actually want. Maybe something like attached would help with this. Just spell it out. Link to comment https://qualityforum.zeiss.com/topic/12736-datum-precidence/#findComment-64040 Share on other sites More sharing options...
[Da...] Posted June 9, 2021 Share Posted June 9, 2021 Either A|B|C or A|C|B are legitimate design decisions. Without information on the design intent, it is hard to recommend one over the other. Personally, from a functional point of view, I would make B the pattern of holes, and call out a profile to A|B for the tip of "C". That probably best represents the described design intent. Link to comment https://qualityforum.zeiss.com/topic/12736-datum-precidence/#findComment-64042 Share on other sites More sharing options...
[An...] Posted June 10, 2021 Share Posted June 10, 2021 _ Link to comment https://qualityforum.zeiss.com/topic/12736-datum-precidence/#findComment-64044 Share on other sites More sharing options...
[Ma...] Posted June 10, 2021 Share Posted June 10, 2021 Using modifier "><" you can say - this controls only orientation and not position Link to comment https://qualityforum.zeiss.com/topic/12736-datum-precidence/#findComment-64046 Share on other sites More sharing options...
[SH...] Posted June 10, 2021 Share Posted June 10, 2021 Please sign in to view this quote. Which standard ISO? Link to comment https://qualityforum.zeiss.com/topic/12736-datum-precidence/#findComment-64048 Share on other sites More sharing options...
[Ma...] Posted June 10, 2021 Share Posted June 10, 2021 Please sign in to view this quote. Yep ISO 5459. Taken from book from 2019 Geometric tolerances by ISO GPS Author Ing. Karel Petr, Ph.D. Link to comment https://qualityforum.zeiss.com/topic/12736-datum-precidence/#findComment-64050 Share on other sites More sharing options...
[Cl...] Posted June 10, 2021 Author Share Posted June 10, 2021 Please sign in to view this quote. My first time seeing this symbol in 22 years. Link to comment https://qualityforum.zeiss.com/topic/12736-datum-precidence/#findComment-64052 Share on other sites More sharing options...
[Ma...] Posted June 10, 2021 Share Posted June 10, 2021 I think it is in ISO maybe from 2017 or 2011 - it's not so common to use new norms after releasing I think. Link to comment https://qualityforum.zeiss.com/topic/12736-datum-precidence/#findComment-64054 Share on other sites More sharing options...
[Da...] Posted June 10, 2021 Share Posted June 10, 2021 Please sign in to view this quote. Y14.5-2009 has one too - the "datum translation symbol" AFAIK, it is the same effect. It is a sideways triangle. Link to comment https://qualityforum.zeiss.com/topic/12736-datum-precidence/#findComment-64056 Share on other sites More sharing options...
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