Filter points ?

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  • Filter points ?

    Hi,

    I have a tiny part to inspect and have to take the profile of the end of the tip (0.5mm width)
    But, here is the thing, i've got my probed points:

    probed_points.PNG

    And here is what it looks like and the CAD:

    probed_points_CAO.PNG

    I don't understand why PCDMIS persists to take points i don't need (the yellow arrows).
    As there isn't any datum, the profile can move into the tolerance zone but those points doesn't allow it and it results in non-conform part...

    I tried to play with the filter but didn't find something really better.
    Is there a way to better filter points ?
    Attached Files

  • #2
    Can you shorten the scan (take a little off each end)?

    Comment


    • #3
      Originally posted by pab39 View Post
      Hi,

      I have a tiny part to inspect and have to take the profile of the end of the tip (0.5mm width)
      But, here is the thing, i've got my probed points:

      probed_points.PNG

      And here is what it looks like and the CAD:

      probed_points_CAO.PNG

      I don't understand why PCDMIS persists to take points i don't need (the yellow arrows).
      As there isn't any datum, the profile can move into the tolerance zone but those points doesn't allow it and it results in non-conform part...

      I tried to play with the filter but didn't find something really better.
      Is there a way to better filter points ?
      What version are you working with? What are you using for your scan? 2D profile?

      Comment


      • #4
        IF it's a 2D profile, you can masked out the ends with added targets...... it's the + icon left of the trash can at the bottom-middle::::::

        scanA.png

        Comment


        • #5
          I tried to shorten the scan but without good results, and the shorter the scan is, the harder it is to find the edge, or i have to place it manually.
          I'm using PCDMIS 2018 and yes, that's a 2d profile scan.

          sealevel you're right, i often use those added target to mask some partial scan on circles, i dunno how i can have missed that for a scan ! I'll try it !

          The thing i don't understand is why PCDMIS shows me some probed points (picture1) that does not correspond to what it is shown on the analysis (picture2), pretty strange.

          Thanks.

          Comment


          • #6
            Originally posted by pab39 View Post
            I tried to shorten the scan but without good results, and the shorter the scan is, the harder it is to find the edge, or i have to place it manually.
            I'm using PCDMIS 2018 and yes, that's a 2d profile scan.

            sealevel you're right, i often use those added target to mask some partial scan on circles, i dunno how i can have missed that for a scan ! I'll try it !

            The thing i don't understand is why PCDMIS shows me some probed points (picture1) that does not correspond to what it is shown on the analysis (picture2), pretty strange.

            Thanks.
            I would say that both pictures show the same hits...
            defaut scan.PNG

            Comment


            • #7
              I would say it would better be like that no ? still don't understand those yellow arrows, like if there was a breach in the part !

              hits.JPG

              Comment


              • #8
                You are measuring a small arc (less than 180°), and I believe the cmm didn't take hits in this area.

                Small arc method gives a wrong center and a wrong diameter, so I think it can explain the yellow arrows...
                Could you try this methd, and then share the result ?
                https://www.pcdmisforum.com/forum/pc...d-from-hexagon
                Last edited by JEFMAN; 06-14-2021, 08:02 AM.

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