Calibration - Standard Deviation exceeds limits

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  • Calibration - Standard Deviation exceeds limits

    I am having a problem getting my 1mmx27.5 probe tip to calibrate.

    I have cleaned the 1mm ruby tip and the calibration sphere. I even changed out the 1mm tip with a new one.

    Here is the report:

    Probe file=T-PROBE_T1X27_M2 Date=6/17/2013 Time=10:05:21 AM

    T1A0B0 THEO X 0.000 Y -5.700 Z 124.320 D 1.000
    T1A0B0 MEAS X -0.030 Y -5.615 Z 124.425 D 0.895 StdDev 0.013

    Why does the diameter keep coming out to 0.895?

  • #2
    That probe is WAY TOO LONG to get good, decent numbers everytime. There is just way too much flex in the shaft.

    You can try slowing down the touch speed to 0.5 and see if it gets any better. HOWEVER, whatever touch speed you use for calibration MUST BE the same speed you use for measurements.
    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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    • #3
      I think you are using a 2mm ruby not 1mm?? Measure your ruby with a pair of calipers to double check
      sigpicSTANDING CORRECTED IS THE ONLY WAY I STAND

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      • #4
        Once you have the proper probe build try calibrating again
        sigpicSTANDING CORRECTED IS THE ONLY WAY I STAND

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        • #5
          It really is a 1mm ruby tip. 27.5 mm stem. It's on a 3mm to 2mm reducer. I slowed the speed down, but I'm still getting 0.013-0.016 mm std dev. It's set for 0.00762 (0.0003in)

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          • #6
            Kinda lost me. What is on a reducer the stem?? That would have nothing to do with you ruby diameter. And it looks like your measuring almost exactly 1mm small??
            sigpicSTANDING CORRECTED IS THE ONLY WAY I STAND

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            • #7
              Originally posted by mgroll77 View Post
              I am having a problem getting my 1mmx27.5 probe tip to calibrate.

              I have cleaned the 1mm ruby tip and the calibration sphere. I even changed out the 1mm tip with a new one.

              Here is the report:

              Probe file=T-PROBE_T1X27_M2 Date=6/17/2013 Time=10:05:21 AM

              T1A0B0 THEO X 0.000 Y -5.700 Z 124.320 D 1.000
              T1A0B0 MEAS X -0.030 Y -5.615 Z 124.425 D 0.895 StdDev 0.013

              Why does the diameter keep coming out to 0.895?
              I suspect you have not defined the probe properly. Are you using all Renishaw or Tesa components in the build? Did you select them all from the "factory" probe list or did you customize some of them? Did you include the M3/M2 converter in the build?
              sigpic"Hated by Many, Loved by Few" _ A.B. - Stone brewery

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              • #8
                It's all Renishaw.
                Here is my build:

                PROBEMIP NoDraw
                Joint:b angle NoDraw
                Joint:a angle NoDraw
                Connect:EXTEN5WAY
                Connect:CONVERT_TO_M2THRD
                Tip #1:TIP1BY27.5MM
                Tip #2:TIP2BY30MM
                Empty Connection #3
                Tip #3:TIP2BY30MM
                Empty Connection #5

                I don't think I customized any.

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                • #9
                  Is there a way to control the trigger force or is that an issue with the MIP head?

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                  • #10
                    The 1x27 stylus is notorious for flexing. The shaft is very small.
                    I quit using that particular stylus exactly because of the flexing problem.
                    Lately, it occurs to me
                    What a long, strange trip it's been.

                    2017 R1 (Offline programming)

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                    • #11
                      Originally posted by John Riggins View Post
                      The 1x27 stylus is notorious for flexing. The shaft is very small.
                      I quit using that particular stylus exactly because of the flexing problem.
                      Same here.

                      If you are using this stylus you need to have the absolute lightest probe touch setting you can possibly get. A TP-2 is nice here because you can lighten the spring tension. A TP-20 has a light force module (forget what it is called).

                      I ran a bunch of tests with this stylus and the results I saw are comparable to what you are seeing (basically awful). If you need something this small you should use a 1X10mm stylus on the end of a 20mm stylus extension (or better yet, no extension unless you need the length).

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                      • #12
                        What they all said
                        sigpic

                        James Mannes

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                        • #13
                          Originally posted by mgroll77 View Post
                          Is there a way to control the trigger force or is that an issue with the MIP head?
                          yes there is ...F10 / OPTIONAL PROBE TAB
                          sigpicRichie the Villian!!

                          V4.2 MR1 CAD++/MISTRAL 10-07-07 DCC/XP

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                          • #14
                            Originally posted by RCW52 View Post
                            yes there is ...F10 / OPTIONAL PROBE TAB
                            I know this is old but for the record this does not work with anything except an analog probe. Trigger force is set by the module with a tp20 system and with an MIP head if you rotate to a90 you will see a little Allen screw that is exposed. This affects trigger force and should be adjusted with a calibrated gram gage.

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                            • #15
                              http://www.cmms.com/deflection-calculator-tm/
                              Here's a helpful calculator.

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