Calibration for multiple probes

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  • Calibration for multiple probes

    I am new and unaware how I should be calibrating multiple probes in a rack so they tie correctly together in one program.

    I have placed the cal sphere back on and continue by starting with the masterprobe and take one hit saying the sphere has moved. Must I repeat this for every probe in the rack or just the master?

    Do I have to calibrate all probes directly after the master in one sitting or will I run into trouble if I only do one or two probes after the master as opposed to all seven probes?
    Last edited by Irongrid; 09-23-2019, 06:31 PM.

  • #2
    Master probe is the ONLY probe that you select "Yes cal sphere has moved"
    For ALL other probe calibrations on the rack, you must select "NO NOTHING MOVED"

    --Typically to get everything to correlate, yes you'd want to cal all probes and all angles at once on a periodic basis. The flavor of this varies widely based on need and applications.

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    • #3
      that depends on the probe used as master, and if you are using it to measure also... but either way always use the same probe and tip as master.

      If it is a dedicated master probe never to measure parts only set the shpere location then you will be fine just setting location for single calibrations, if it is not used to measure it is unlikely to change geometry at all and will locate the ball reliably, I use a 4mm x 10 tip... keep it short to keep standard deviations low, that 4x10 always gives me less than .0001" sd on calibrations.

      If you are using the master probe tip to also measure parts who is to say it does not get bent/changed a bit in use then you use it to set sphere, that would give you error from prior calibrations, that is the benefit of a dedicated master probe in a nutshell

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      • #4
        And yes are master is also used to measure parts.

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        • Douglas
          Douglas commented
          Editing a comment
          the risk in doing that is that general use is much more likely to change the geometry of your master probe, and if it changes then you use it to locate the sphere, any such change will be seen in correlation of probes.

          If that master probe is ever crashed or rebuilt for any reason you need to do the whole rack, all probes from the master. When I keep mine out of use it will be good for years with no such concern. With more than one operator there might be no way to know if this happens either.

        • Schlag
          Schlag commented
          Editing a comment
          You should eliminate that. Build a duplicate probe or work on the programs that use that probe and switch it to an alternative probe. You will be happier in the long run.

      • #5
        This is an old tech sheet that people may find helpful
        Attached Files
        Neil Challinor
        PC-DMIS Product Owner

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

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        • #6
          Originally posted by Irongrid View Post
          I am new and unaware how I should be calibrating multiple probes in a rack so they tie correctly together in one program.

          I have placed the cal sphere back on and continue by starting with the masterprobe and take one hit saying the sphere has moved. Must I repeat this for every probe in the rack or just the master?

          Do I have to calibrate all probes directly after the master in one sitting or will I run into trouble if I only do one or two probes after the master as opposed to all seven probes?
          in the probe calibration window create a set of parameters, before that select the angles to be calibrated, save the set of parameters, then go to operations, automatic probe calibration insert the command and then select the set of parameters that I generate, with this you can have a routine of calibration of all your tips and angles

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