Cylinders Issue

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  • Cylinders Issue

    I have culinders in a program, they all inspect fine when viewing part on machine (actual hits all look good).
    I take four hits at two levels.
    On screen, vector of cylinder after inspection is 90 degrees out (centerline shows parallel to surface, cylinder is normal to.
    I change cylinder to check three hits at three levels.
    Cylinders check fine.
    Centerline is correct, true location within .010
    Has anyone else seen this, is this a known problem.
    PC D-MIS V3.7 MR2, Windows XP.

  • #2
    i remember being told by the instructor at the training course to always use atleast three levels when measuring a cylinder.

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    • #3
      Been a problem for a LONG time. You need a minimum of 3 levels of this to keep the cylinders on the right axis.
      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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      • #4
        Cylinders Issue

        I have a hole going through a corner of a part.
        Both top and bottom surfaces hole goes through are not normal to hole.
        I make a cylinder and the vector always ends up normal to the surface.,
        not along the centerline of the hole.
        I had to go into Catia, get the actual hole vector and update the cylinder in PC D-MIS.
        Is this a known problem? perhaps there is a setting I need to change?

        (This was supposed to be a separate post)
        Last edited by RussL; 03-20-2006, 10:09 AM.

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        • #5
          If I take hits at four levels, PC-DMIS seems to always create two cylinders. Not much experience here, so I'm probably missing something obvious.
          sigpic
          Just a scooter pilot

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          • #6
            Thanks folks. I've been having fun with cylinders too. 3 or 4 points at 2 levels. I'll try the 3 level trick. No training here, just hard knocks.

            T. King
            sigpicHave a homebrew

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            • #7
              8 is the worst number of points for cylinder

              8 is the worst number of points to use on a cylinder. If the distance between levels is close to the diameter, the algorithm can construct the vector in 6 possible directions. And I agree that 3 levels definitely works better.

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