Second Time not a Charm

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  • Second Time not a Charm

    Good morning,

    We did a full calibration of a long probe with a saved parameter set. ( global silver-Renishaw ) Later, we tried to do a partial calibration of the same probe with the same saved parameter set. When it got to the A 105 degree wrist angle, it took the probe all the way to the top, and spun it around, dragging it over the underside of the machine. What would make it take it higher on a partial calibration than on a full calibration. Or maybe it's something else not related to the partial, or the saved set.

    Thanks.

  • #2
    Sounds like somebody could have changed the clearance values on the SETUP tab of the probe utilities window.
    Neil Challinor
    PC-DMIS Product Owner

    T: +44 870 446 2667 (Hexagon UK office)
    E: [email protected]

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    • #3
      partial calibration, meaning you didn't calibrate all the angles. So, it went from an A0B0 to an A105Bxxx instead of, say, an A45Bxxx, which will result in a much higher rotation position.
      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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      • neil.challinor
        neil.challinor commented
        Editing a comment
        I was taking it as the SP25 partial calibration - 5 touch trigger points for each tip rather then the full scanning cycle it usually does. Flintstone , can you please clarify?

      • Matthew D. Hoedeman
        Matthew D. Hoedeman commented
        Editing a comment
        OK, that would be a little different.

    • #4
      Yes,
      It is indeed the touch trigger points instead of the full scan.

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      • neil.challinor
        neil.challinor commented
        Editing a comment
        In that case, open the probe utilities window, click SETUP and check what clearance distance you have for "ALONG qualification tool shank vector for non-continuous wrists". It defaults to 88.9mm (3.5 inch) but if somebody has entered a larger value, that could explain the behaviour you described. The clearance distances and other parameters on the setup tab do not get stored as part of a parameter set as they are global settings for the whole system.

    • #5
      Thanks Neil,

      The clearance distance along shank for non-continuous wrists was set at 304.8. Don't know why exactly. We changed it to 88.9. The clearance distance along continuous wrists is also set at 304.8. Is this something we should change as well?

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      • neil.challinor
        neil.challinor commented
        Editing a comment
        If you don't have a continuous wrist it won't have any effect.

    • #6
      Changing the clearance distance to 88.9 does seem to have fixed my problem.

      thanks again.

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