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  1. snowboard1

    Co-Datums

    3DDave: The explanation the machining house / CMM house provided for preferred A|B-C datum instead of A|B|C is that the mis-location tolerance between datums B and C would help to 'split the difference' on locating the center of the part (see attachment...
  2. snowboard1

    Co-Datums

    Thanks to everyone for the feedback. I was also able to speak with a CMM inspection house today and confirmed that using B-C datum in combination with a plane A, fully defined all the degrees of freedom and that no other datums are required. I gave them a choice of using a structure of Datums...
  3. snowboard1

    Co-Datums

    axym, Thanks for the clarification. Exactly what I was looking for.
  4. snowboard1

    Co-Datums

    JHG, I suspect you do not need Datum D (since the combination of Datum A and the two pins B, C completely constrain the part) but this is the crux of the question from the thread.
  5. snowboard1

    Co-Datums

    Thanks for the response, JHG. I completely understand the trivial case of setting up three datums you mentioned above as primary, secondary, and tertiary. However, my question is different... I would like to set up the datums with Datum A being the large flat face and Datums B-C working...
  6. snowboard1

    Co-Datums

    Sorry to re-open a previous thread thread1103-364740 but I wasn't clear if AMontembeault's great question was fully answered and I've run into the same issue. Copy and paste from that thread: "Suppose I had a piece of plate with 2 holes in it. Each hole is specified as a datum (in this case...

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