Measurement points relative to CAD, and not carline co-ordinates

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  • Measurement points relative to CAD, and not carline co-ordinates

    Hello there,

    Before i ask anything, i should probably mentioned that running the CMM is not my usual job, i'm just supporting for a short period.

    I'm currently measuring an automotive part, and need to understand where some points on a surface is.

    My process so far is as follows:

    - Position part on CMM table
    - Set CAD axis to Machine axis
    - Manual Iterative alignment on 7 points (i'm using 1 extra for level) to find the part
    - DCC Iterative alignment on actual datum targets (x3 holes on the part)
    - Take points in areas of interest
    - Output measurements

    Everything seems to be going good so far, however i've come across a minor issues with the measurements.
    My measurements are showing the nominal's, and measured values relative to the car line coordinate system.
    What i want to do is show these measurements relative to CAD model instead. So for example on attached image, i'm getting the following:

    Measurements.jpg

    NM(X): 1787.771
    MS (X): 1789.799
    DV (X): 0.028

    I would like the nominal to be 0 (CAD model), and the measurement deviation to be relative to this, and not the car line coordinate system.

    Is this possible to do?
    If so, i would appreciate the guidance.
    Last edited by Joshh; 05-15-2019, 07:29 AM.

  • #2
    After you align the part to the cad model (no matter what position the cad model is in) simply make a NEW alignment, picking the features you have measured that you want to be zero (and NOT the cad model values) and origin to them, no level, no rotate, just origin to the feature(s) you want to be ZERO, and you are done. Make the dimensions to that alignment
    sigpic
    Originally posted by AndersI
    I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

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    • #3
      Originally posted by Matthew D. Hoedeman View Post
      After you align the part to the cad model (no matter what position the cad model is in) simply make a NEW alignment, picking the features you have measured that you want to be zero (and NOT the cad model values) and origin to them, no level, no rotate, just origin to the feature(s) you want to be ZERO, and you are done. Make the dimensions to that alignment
      Appreciate the quick response, thank you very much. I will give that a try!

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      • #4
        Good Morning Josh

        Try using T value instead of X axis. T value will report the deviation of that point perpendicular to the surface and will have a nominal of 0.0. If you want to use the X axis you would need to create a local alignment.

        Scott

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