Flatness Check?

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  • Flatness Check?

    Typically how does one go about doing a flatness check of a surface with PC DMIS?

  • #2
    First, understand that checking flatness with a CMM is not the best way to check flatness. In reality, you will only be checking the flatness of the portions that the probe touches.

    Second, take a bunch of manual hits to create a plane or create an autoplane. Then, go to insert - dimension - flatness, select your plane and then click on "create". That should do it.

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    • #3
      Originally posted by Goodluck View Post
      First, understand that checking flatness with a CMM is not the best way to check flatness. In reality, you will only be checking the flatness of the portions that the probe touches.
      and the flatness is from the best-fit plane... not as good as other methods, but it is better than nothing...
      Links to my utilities for PCDMIS

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      • #4
        Scans would be best for checking tight tolerance flatness. Just remember to filter your scans if your surface is not perfect.
        I used to be high on life but I built up a tolerance.

        Brown & Sharpe Global Advantage
        PCDMIS CAD++ v2011mr2
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        • #5
          Also it can be dimensioned from location check the form box . This is nice if you need to report other info related to the plane.
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          • #6
            How big is the part. Can it be check on a Plate? I think one of the big misconceptions is the CMM should be used to check everytying on a print. When it if fact there are a lot of reasons to still use the Plate. Problem is the new generations of Layout Inspectors have never been trained to use the Plate and have been thrown onto the CMM and thats the only tool they know. Flatness and Perp callouts are best done on the plate if posible.
            sigpicSummer Time. Gotta Love it!

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            • #7
              I agree with all here. I have often stated, "double check on a plate, verify that your CMM measurements are close." Paul says it well. The technology is hurting in some ways. Fortunately, I have a "kid" (I think he is late 20's maybe 30) checking parts on the plate here. Doing it very well.
              When in doubt, post code. A second set of eyes might see something you missed.
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              • #8
                Originally posted by John Kingston View Post
                I agree with all here. I have often stated, "double check on a plate, verify that your CMM measurements are close." Paul says it well. The technology is hurting in some ways. Fortunately, I have a "kid" (I think he is late 20's maybe 30) checking parts on the plate here. Doing it very well.
                That's so cool John. Its like they say " Use It or Lose It"
                sigpicSummer Time. Gotta Love it!

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                • #9
                  Originally posted by Paul Sarrach View Post
                  How big is the part. Can it be check on a Plate? I think one of the big misconceptions is the CMM should be used to check everytying on a print. When it if fact there are a lot of reasons to still use the Plate. Problem is the new generations of Layout Inspectors have never been trained to use the Plate and have been thrown onto the CMM and thats the only tool they know. Flatness and Perp callouts are best done on the plate if posible.
                  DEAD ON PAUL!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I have been trying to get this point across to management for years!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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                  • #10
                    http://sp1.mm-a6.yimg.com/image/3518152100
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