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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?
  • in reply to Thiyagu_Raj
    I have no idea what fast is so cant help there.

    A question I have though, is this your "master" probe? as your measured results are way off compared to the theo's for A0B0. They should be spot on 0

    If it isn't your master probe then this question doesn't matter.
  • in reply to Thiyagu_Raj
    2 X 50 for a Master? Or am I reading this wrong?
  • The X1h is an analog probe. Very accurate, but the analog probing cycle is very slow compared to trigger probes. It's a time penalty for the increased accuracy.

    FASTPROBEMODE allows you to take hits with the x1h as a trigger probe, with a little (very little in my testing) decrease in accuracy. During probe calibration pc-dmis calculates results for both analog probing mode and fast probing mode.

    PRBRDV is probe radial deviation. My understanding is that it's kind of like effective tip diameter, but expressed in a different way . I believe it's only used when scanning.

    You can enable "fast probing" by using FASTPROBEMODE/ON in your program. You can toggle it on and off within the same program, so you have accuracy where you need it, and speed where you don't. I tested fast probing by evaluating form and size on ring gages with styli up to 150mm long. The difference between fast and analog modes was around .002mm.

    Strongly recommend using absolute speeds in the F5 setup dialog box with the x1h probe.
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