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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?
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  • The THEO is the number calculated to where it SHOULD find the probe offsets to be. If the head was perfectly square, the lengths were all perfect ect.....if that was the case, there would be no need to calibrate in a perfect world. As you will always see, there is some deviation of location, this is just fine...it is the actual amount it is going to use to offset. as long as you can get the probe to calibrate without crashing, it doesn't matter if the head is all that square...but once you add extensions, that out of squareness makes it next to impossible to calibrate without squaring it up...there is my chime...
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  • The THEO is the number calculated to where it SHOULD find the probe offsets to be. If the head was perfectly square, the lengths were all perfect ect.....if that was the case, there would be no need to calibrate in a perfect world. As you will always see, there is some deviation of location, this is just fine...it is the actual amount it is going to use to offset. as long as you can get the probe to calibrate without crashing, it doesn't matter if the head is all that square...but once you add extensions, that out of squareness makes it next to impossible to calibrate without squaring it up...there is my chime...
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