True Position of Angled Hole depth

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  • True Position of Angled Hole depth

    I am reporting the depth of some angled flat bottomed holes as a true position. I have drafted a basic drawing to explain the feature and the DRF. I have tried reporting it with the X, Y and Z ticked in the 'Nominals' tab, and with just the X ticked. I have also reported the depth as a T value. None of the results tie up with one another. Datum plane A is a plane on the face, datum B is the Ø10mm hole as a cylinder and datum C is a midpoint in the 10mm slot. Can anyone advise: 1. Am I using the correct features to define my datums (not A, just B and C) and 2. What is the correct process for generating the results with regards to the axis selection tick boxes in the nominals tab. Thanks in advance.
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  • #2
    Offset your alignment 40.2 from Dat A, then rotate 25° around, then you should just report in one axis and the nominal should be 60.
    Automettech - Automated Metrology Technology

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    • NinjaBadger
      NinjaBadger commented
      Editing a comment
      Doesn't just have to be on co-axial features @DAN_M.

      A-B on a plane-cylinder is perfectly valid, as is A-B on two holes (In effect you're splitting the difference between them so neither had precedence).

      https://www.dropbox.com/s/0lq4yj7v8w...datum.JPG?dl=0

    • DAN_M
      DAN_M commented
      Editing a comment
      Thank you very much for the explanation! I have never seen it used like this before.
      Last edited by DAN_M; 12-14-2020, 11:11 AM.

    • NinjaBadger
      NinjaBadger commented
      Editing a comment
      I can't remember where I got that from, I'm guessing it was an ISO standard but I can't be certain (looks like it though).

  • #3
    Thank you everyone.

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