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Positional measurements that I don't understand.

Vladimir
Hi Colleagues, I am currently working on one part which is a circle with three ears. It has positional measurements, which I had difficulty with. They are marked in red in the attached photos.
As far as I understand, if the reference point is the central circle, then the controlled elements should be controlled only along the PR, but I can not understand how to represent this in Pcdmis.
I hope you can give me some tips for this.
PS
I use 2014 version PCdmis, and xact.
PPS
Datum D what is this??! Dia 100? But it's dat A in my opinion...Alien


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Parents
  • Is datum D used as a control someplace?
    In your snips, it looks like the only relevant datums being used in a control are A and C.
    --Engineers love to complicate prints with un-utilized datum callouts. The datum reference is noise until used in a FCF.

    Figures. We've got too many design engineers who are great with calculus 55 & catia but spend one semester doing gd&t & nothing beyond that. After having too many fights with them, I began requesting assembly prints & build individual component programs based on how they are either machined and/or assembled. Often I toss their datum schemes out of the proverbial window.
Reply
  • Is datum D used as a control someplace?
    In your snips, it looks like the only relevant datums being used in a control are A and C.
    --Engineers love to complicate prints with un-utilized datum callouts. The datum reference is noise until used in a FCF.

    Figures. We've got too many design engineers who are great with calculus 55 & catia but spend one semester doing gd&t & nothing beyond that. After having too many fights with them, I began requesting assembly prints & build individual component programs based on how they are either machined and/or assembled. Often I toss their datum schemes out of the proverbial window.
Children
  • in reply to MattR
    I had a friend go through ASU's industrial engineering program. They spent no more than ONE WEEK discussing GD&T.

    If you work for a big corporation that prides themselves on continuous improvement, suggest to the improvement folks that you want a design review board implemented (or to include someone with Metrology/GD&T experience if already present) before a design goes to production. super fundamental.
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