Standard deviation error for probe calibration.

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  • Standard deviation error for probe calibration.

    Cant figure out what it is. I have a 1mm TP20 on an SM25 base. After restarting my machine and PCDMIS, I started getting a deviation of .02 mm when trying to use this as my master probe. I took apart the whole thing and cleaned it with a microfiber and the cleaning putty, put it back together, and now Im getting a deviation of .03. Any suggestions of other things to check? I'll post a picture of the probe settings shortly.

  • #2
    Is the ruby intact?
    What about the calibration sphere?

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    • #3
      double check and make sure your probe build is the same in both the software and on the cmm. after running for 4.5 years i still mistake a .7mm for a 1mm probe.
      Che Guevara is a communist scumbag.

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      • #4
        Ruby tip was fine, went to double check the calibration ball was intact and...
        calibration ball was loose. So I guess the joke's on me... how many metrologists does it take to screw in a calibration sphere? Apparently more than one.

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        • #5
          I've had a bad std dev some times, when the stylus was not properly screwed on. Try to tighten it with an appropriate tool.
          DEA Mistral (PC-DMIS 3.5)
          Zeiss Contura G2 (Calypso)
          Zeiss Accura (Calypso)
          Zeiss MC 550 (PC-DMIS 3.7)
          Mitutoyo BH 706 (MCOSMOS Geopak)

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          • #6
            Originally posted by ANDREW CRAWFORD View Post
            Ruby tip was fine, went to double check the calibration ball was intact and...
            calibration ball was loose. So I guess the joke's on me... how many metrologists does it take to screw in a calibration sphere? Apparently more than one.
            had that issue before. the sphere just came off the shank

            I fixed it with JB weld

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            • #7
              Yeah, Ive already had the shank not being screwed on bite me in the *** a while ago. There's a lot of stuff to remember but you (usually) only have to make the mistake once and you don't forget!

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