Beginner alignment question

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  • Beginner alignment question

    When datums [B] and [C] are both circles through datum [A] plane and [C] is located on the print at 100mm in the X and 20mm in the Y, do you use [C] to set the 20mm offset in Y or do you rotate to [B] and [C] and rotate back the nominal angle (11.31°)?

  • #2
    How about a bestfit alignment?

    Start with a regular primary alignment in Z for the plane (zero in Z too).
    Make sure you have the Z-workplane active.
    Set X and Y-zero in [B].
    Enter bestfit alignment section.
    Select B and C as your features for the bestfit alignment.
    Select 2D - no translation. This will keep the bestfit alignment rotating around B.
    Click "Calculate".
    Click OK to return to the "regular" alignment dialog.
    Click "Create".

    If the 20 mm is boxed but the 100 is not, then you should use an offset line between B and C offset with 20 mm and align to that.
    PC-DMIS CAD++ 2o19 R1 SP11


    • #3
      Rotate by the angle.

      Unless the pitch between B&C is perfect and you do an offset line then report the angular deviation of C you will see some deviation.

      Automettech - Automated Metrology Technology


      • #4
        So if my print depicts datum [C] with an arrow head I should use the angle in my alignment but if the print depicts [C] using parallel lines in the Y axis I should set the offset of 20mm?


        • #5
          Can you post a section of the print including the dimensions to [C]?

          Otherwise we will keep guesstimating...
          PC-DMIS CAD++ 2o19 R1 SP11


          • #6
            I can't show any more than this. In this scenario I would rotate to [C] then rotate back the nominal angle to get to "print" position and not set the offset?
            Attached Files


            • Matthew D. Hoedeman
              Matthew D. Hoedeman commented
              Editing a comment
              construct a line between them, use that line for rotate, then rotate about your level axis by the nominal degrees of that line.

              Editing a comment
              ...or create an offset line between B and C, offset by 58.84.

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