Surface profile with datums

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  • Surface profile with datums

    hey all,

    i have a surface profile i have to measure, its relative to a b and c. unfortunately the only decent place to locate the part on is one of the datums. There for I can't measure the datum to define it... using
    Code:
    DATDEF/DAT_C,C
    I can measure datums A and B and define them.

    When i output the report it shifts the Z b/c it is not "constrained" by any datum.

    what would be the best way to go about this reporting to the correct z position relative to the datums?

    thanks in advance for the help

  • #2
    You are supporting the part on one of the datums...can you probe the surface that the part is supported with?
    *
    sigpic

    Sometimes the lights all shining on me...
    Other times I can barely see.

    3.7 MR4(step patch) CAD++

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    • #3
      hey thanks for getting back to me,
      been really busy!


      not while the part is loaded.
      The datum I can't hit is located at 0,0,0. i level and translate my z axis to this in a fixture alignment
      if i did this
      Code:
      F1         =GENERIC/PLANE,DEPENDENT,CARTESIAN,$
                  NOM/XYZ,<0,0,0>,$
                  MEAS/XYZ,<0,0,0>,$
                  NOM/IJK,<0,0,1>,$
                  MEAS/IJK,<0,0,1>
      DATDEF/F1,C
      Would this be legal?

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      • #4
        If the surface you are leveling to is normal to and contacting the datum, then yes, perfectly legal.
        I do the same thing quite often.
        In fact, probing a simulated datum like that is in some ways better practice than probing the actual datum surface.
        *
        sigpic

        Sometimes the lights all shining on me...
        Other times I can barely see.

        3.7 MR4(step patch) CAD++

        Comment


        • #5
          AWESOME!!!!
          thank you for the help!

          Comment


          • #6
            If that's stable surface you could measure it before you place part on it
            sigpic...engineering

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