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Qualification Sphere Standard settings

Fearthebeard
Is there a standard setup for calibrating tips on a qual sphere? Number of hits? Prehit/retract? Move speed? Touch speed? Levels? Number of shank hits? start/end angles? etc...

Or is it all about preference? Min of 5 on 2 levels?

Also is there a way to add avoidance in a certain axis during calibration? I have a 10mm star probe and when measuring T5 at a90b180 the Tp20 is hitting the 1 inch shpere while trying to come around the back side of the sphere. So if I could drop it in the Z before it makes that move, I could get to the last hit without it crashing.

Any help is appreciated!
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  • For a touch probe (Either one of the Tesa/Hexagon ones or the TP20) then you need min of 5 hits on two levels. More hits should be more accurate up to a point, personally I probably wouldn't go above 13 hits over 3 levels.

    Touch speed can be anything from 1 or 2 mm/sec, up to 8 to 10mm/sec. I always used to think 2mm/sec was most accurate, however I'm now more inclined to think that anything from 2 to 5 mm/sec you won't see much variation (it can be machine dependent).

    As Jeffman said - touch speed in the program should be the same as touch speed for calibration.



    For the Hexagon scanning probes you want either 15 or 25 hits over 3 levels. If you do a lot of scanning you can also calibrate Scan RDV for more accurate scanning results.

    Touch speed should be 2mm/sec.



    For SP25 it's a canned routine which scans over and around the sphere.
  • in reply to NinjaBadger
    I think he's talking about a TP20... Wink
    But your answer can help other peoples, thx !
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