Probe Calibration (problems with master probe and head squareness)

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  • Probe Calibration (problems with master probe and head squareness)

    I have a issue where I have 6 different probes set up in a tool changer, however there is no calibration program for this machine, the calibration method has been to calibrate each probe within the program to be ran by selecting 'mark used" in the utilities probe box. So I'm not even sure there is a master probe in this case. First question: how do you determine which probe is the master probe?

    I have a couple of different issues, initially I could not get, what I think is the master probe, at T1A0b0 to calibrate so the x axis was not off by .3 until I clicked on the box that says 'reset tips to theo at start of calibration'. The problem after that is the T1A0B0 will calibrate with both y and x at 0, but when I go to calibrate another tip or angle, those tips and angles are off by approximately .3 and when I do a 'use DCC hits to locate the tool' it will find the tool and run, but when I go back to the original probe @ T1A0B0, the original probe is off again by .3 and even if I do not calibrate another probe or angle after calibrating the original probe, the original probe starts to lose its calibration, off by .008 or .009 in both the x and the y.

    Another problem that I have been having of late is that when I press the enable button, the probe or arm drifts in the z, x or Y direction on it's own, now this appears to have stopped temporarily and the 'done' button does not work on the joystick. I am ordering a joystick but could this problem be related to the calibration problem?
    "What doesn't kill you makes you stronger".

  • #2
    The Master Probe is normally the first probe calibrated after a machine Certification (Calibration) and only matters if you need to use it in relation to other probes on a single part.

    Have you tried saying 'YES' to has the artifact been moved before you calibrate your 'Master Probe'. Also, is the artifact defined properly in the 'Probe File'?

    A quick search for jogbox drift with get you at least 11 hits for correcting your last problem you may not be able to correct it with out the 'done' key:
    http://www.pcdmisforum.com/search.php?searchid=723375

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    • #3
      PC-Dmis does not use a Master Probe, per se. If I need to use more than one probe in a program, I'll load the first probe, and calibrate A0B0 telling it that the cal sphere has moved. Then I'll calibrate the other angles on this probe, AND all of the other probes and their angles, saying that the cal shere has not moved. Now they are all relative to that first A0B0 calibration. HTH.

      As for your axis drift, there's a procedure you can do called Joystick AutoZero. Do a search here for it.
      sigpic
      Global Advantage 12-22-10
      TESASTAR M SP25 4.3mr2

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      • #4
        Originally posted by keego View Post
        PC-Dmis does not use a Master Probe, per se.
        Keego it does if you have a probe rack. I have a master cal program that I run at once a week, more often if I feel the need or someone has a crash. It take around a hour to run, but afterward I can run any program and the tips will be calibrated. 11 different tips in various angles. I use the same list while programming and rarely have to add a new angle.


        Tubes the numbers you are seeing are normal and are error factors from theo for each tip, and if your trying to reset them you need more help that what you get from the forum.

        and by the numbers you used, Look up Squaring the head at the same time.
        sigpic

        B&S Global 544
        Using 3.7mr3


        Peace
        Greg


        Nothin left ta dew but :) :) :) !

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        • #5
          Originally posted by Tubes Campbell View Post
          So I'm not even sure there is a master probe in this case. First question: how do you determine which probe is the master probe?
          Miss this question

          Slot 1 A0B0

          I can get you the first couple of probes of the cal program if you want
          sigpic

          B&S Global 544
          Using 3.7mr3


          Peace
          Greg


          Nothin left ta dew but :) :) :) !

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          • #6
            Originally posted by Gregl View Post
            Miss this question

            Slot 1 A0B0

            I can get you the first couple of probes of the cal program if you want
            Not exactly true.
            Your master probe is whatever probe you use to set the ball position.
            I have a setup with 7 fcr25s for use with an sp25 and various probe configurations.
            (scanning and touch trigger)
            My master probe is rack 3 slot 2 and I have an auto cal routine for all the probes on a dual ball setup.
            As long as you use the same probe to locate the ball/s you can use any probe in the rack as master.
            (I personally use the same setup as I use for the rack calibration itself).
            Roses are red
            Violets are glorious
            Don't try to sneak up
            On Oscar Pistorius.

            MIL-TFP-41C

            3.7mr3, 2012mr1, 2013mr1

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            • #7
              Originally posted by Gregl View Post
              Keego it does if you have a probe rack.
              Hence why I said, "per se." But, unlike some, like Zeiss/Calypso, it can be any probe of your choosing. With Zeiss there is an absolute Master Probe, that is machine specific, and it is used for nothing but qual shpere referencing and RT axis definition. (and perhaps some things I've not yet been exposed to, but never used for measurement)
              sigpic
              Global Advantage 12-22-10
              TESASTAR M SP25 4.3mr2

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              • #8
                You were exactly right. Squaring the head was the answer.! Thank you
                "What doesn't kill you makes you stronger".

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                • #9
                  Originally posted by keego View Post
                  Hence why I said, "per se." But, unlike some, like Zeiss/Calypso, it can be any probe of your choosing. With Zeiss there is an absolute Master Probe, that is machine specific, and it is used for nothing but qual shpere referencing and RT axis definition. (and perhaps some things I've not yet been exposed to, but never used for measurement)
                  Only MASTER PROBE by name. It can be any size or length styli that you want to use as long as you use it MASTER PROBE

                  Oh crap!! This is supposed to be the PC-DMIS forum LOL
                  Xcel & MicroVal Pfx & Global 37mr4 thru 2012mr1sp3
                  Contura Calypso 5.4

                  Lord, keep Your arm around my shoulder and Your hand over my mouth. Amen.

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