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Understanding Calibration Results

TheBradish
I don't usually look at the probe calibration results because I don't really understand what I'm looking at. I'd really like to gain a firm understanding of the data and what it should mean to me.

I've been digging through old threads, and I'm getting closer. What I think I get is that StdDev is the standard deviation of single-point error of the measured sphere for each tip angle. (I was told by another inspector here that that number should be .0002 or less.) I also understand that the MEAS D determines the effective probe diameter for each tip, and is used for probe size compensation.

I don't fully understand the THEO/MEAS XYZ (where the THEO comes from, what the MEAS means), or what is a maximum permissible error. What do you guys look for when you read your calibration results? What do you hope to learn from the numbers? What do you consider to be a red flag?
Parents
  • hello, i want to add one more question with this thread...


    i'm using Hexagon Probe Head HH-AS8-T2.5 with Leitz_LSPX1H_T Probe and my calibration results are... 

    Probe file=2BY50 Date=06-Apr-18 Time=8:49:11 AM

MASTER CENT X 260.735 Y 384.713 Z -456.232 D 25.000
T1A0B0 THEO X 0.000 Y 0.000 Z 274.000 D 2.000
T1A0B0 FAST X -0.510 Y -0.081 Z 274.068 D 2.000 PrbRdv -0.018
T1A0B0 MEAS X -0.509 Y -0.084 Z 274.072 D 2.000 PrbRdv -0.004 StdDev 0.002

T1A90B0 THEO X 0.000 Y 208.800 Z 65.200 D 2.000
T1A90B0 FAST X 1.122 Y 209.040 Z 64.931 D 2.000 PrbRdv -0.012
T1A90B0 MEAS X 1.121 Y 209.039 Z 64.932 D 2.000 PrbRdv -0.002 StdDev 0.002

T1A90B90 THEO X -208.800 Y 0.000 Z 65.200 D 2.000
T1A90B90 FAST X -209.326 Y 1.207 Z 64.939 D 2.000 PrbRdv -0.012
T1A90B90 MEAS X -209.323 Y 1.207 Z 64.939 D 2.000 PrbRdv -0.002 StdDev 0.002

T1A90B180 THEO X -0.000 Y -208.800 Z 65.200 D 2.000
T1A90B180 FAST X -1.490 Y -209.235 Z 64.644 D 2.000 PrbRdv -0.010
T1A90B180 MEAS X -1.489 Y -209.233 Z 64.644 D 2.000 PrbRdv 0.000 StdDev 0.000



    In the above result what does the Fast and PrbRdv denotes ?
    The PrbRdv was repeating 2 times one in fast and another in measure but both the results are completely different.....
    can anyone explain this ?
Reply
  • hello, i want to add one more question with this thread...


    i'm using Hexagon Probe Head HH-AS8-T2.5 with Leitz_LSPX1H_T Probe and my calibration results are... 

    Probe file=2BY50 Date=06-Apr-18 Time=8:49:11 AM

MASTER CENT X 260.735 Y 384.713 Z -456.232 D 25.000
T1A0B0 THEO X 0.000 Y 0.000 Z 274.000 D 2.000
T1A0B0 FAST X -0.510 Y -0.081 Z 274.068 D 2.000 PrbRdv -0.018
T1A0B0 MEAS X -0.509 Y -0.084 Z 274.072 D 2.000 PrbRdv -0.004 StdDev 0.002

T1A90B0 THEO X 0.000 Y 208.800 Z 65.200 D 2.000
T1A90B0 FAST X 1.122 Y 209.040 Z 64.931 D 2.000 PrbRdv -0.012
T1A90B0 MEAS X 1.121 Y 209.039 Z 64.932 D 2.000 PrbRdv -0.002 StdDev 0.002

T1A90B90 THEO X -208.800 Y 0.000 Z 65.200 D 2.000
T1A90B90 FAST X -209.326 Y 1.207 Z 64.939 D 2.000 PrbRdv -0.012
T1A90B90 MEAS X -209.323 Y 1.207 Z 64.939 D 2.000 PrbRdv -0.002 StdDev 0.002

T1A90B180 THEO X -0.000 Y -208.800 Z 65.200 D 2.000
T1A90B180 FAST X -1.490 Y -209.235 Z 64.644 D 2.000 PrbRdv -0.010
T1A90B180 MEAS X -1.489 Y -209.233 Z 64.644 D 2.000 PrbRdv 0.000 StdDev 0.000



    In the above result what does the Fast and PrbRdv denotes ?
    The PrbRdv was repeating 2 times one in fast and another in measure but both the results are completely different.....
    can anyone explain this ?
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