[Ke...] Posted October 18, 2021 Share Posted October 18, 2021 For the image, below: Datum E is a Cylindrical feature Datum F is a Hole Diameter Datum A is a Plane Datum C is a Plane The first level of the control frame: not much to unpack The second level of the control frame: - I'm used to seeing composite control frames where the 2nd level is a refinement of the 1st level (uses the same datums, but fewer) -Datums A & C are both planes, with the same angles, but on seperate levels... Calyso allows me to use A as Primary, and C as Secondary datums... but my guess would be that Datum C would be ineffective, Thoughts? I don't have a physical part, yet... Link to comment https://qualityforum.zeiss.com/topic/11828-confounding-composite-position/ Share on other sites More sharing options...
[Jo...] Posted October 18, 2021 Share Posted October 18, 2021 I don't think that is a legal Composite callout. ASME Y 14.5-2018 10.5.2 is what it "should" be. figure 6-27 Link to comment https://qualityforum.zeiss.com/topic/11828-confounding-composite-position/#findComment-58780 Share on other sites More sharing options...
[Ke...] Posted October 18, 2021 Author Share Posted October 18, 2021 Please sign in to view this quote. Meaning that it should be split into 2 single segment control frames, yes? What about the use of A as primary, & C as secondary (presuming that it is called out as a single segment control frame)? ...my best guess is that they want A & C to be used as an offset plane (A-C) Link to comment https://qualityforum.zeiss.com/topic/11828-confounding-composite-position/#findComment-58782 Share on other sites More sharing options...
[Jo...] Posted October 18, 2021 Share Posted October 18, 2021 Please sign in to view this quote. I think technically it has to be single segment control frame to allow different Datums. I'm not even going to venture a guess concerning design intent. Link to comment https://qualityforum.zeiss.com/topic/11828-confounding-composite-position/#findComment-58784 Share on other sites More sharing options...
[Ro...] Posted October 18, 2021 Share Posted October 18, 2021 Hi Keith, Please sign in to view this quote. Yes Please sign in to view this quote. The way it is now, -C- does nothing because -A- is already constraining 2 rotational and 1 translational per the Can/May/Must rule. If they wanted an offset plane then they would be co-datums A-C in the FCF as you stated. Or they would need to release degrees of freedom in -A- and assign them to -C- in the FCF. Link to comment https://qualityforum.zeiss.com/topic/11828-confounding-composite-position/#findComment-58786 Share on other sites More sharing options...
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