Scan results different from keyed-in points

I have a part with a very tight profile tolerance (form+location) of .0005. I wrote a program with a model and aligned to all 3 datums.

I keyed in gage points and read the vectors from the model. Part is out of tolerance (which I expected) by about .001, the profile being off center.

Next I added a linear TTP scan along the same section where I probed the gage points. The scan shows deviations up to .018!

Same program, same part, same alignment.

What could I be doing wrong with my scan to get a result that differs so much from my keyed-in points?

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TheBradish over 11 years ago

Latest quirk: As posted above I started a new program and my scan got a lot closer. OOT by tenths, not several thousandths.

I was fiddling with my settings for the linear open scan, variable. More hits. Also I changed my Exec Controls from NORMAL to RELEARN. Deviation is 000.
After changing back to NORMAL, scan is in tolerance, deviation of .00013.

This is too good to be true, isn't it? I was under the impression that RELEARN makes the program learn the vectors during each execution. Did I accidentally reset my nominals when I did this? Is that even possible when using a model? Getting more confused...
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TheBradish over 11 years ago

Latest quirk: As posted above I started a new program and my scan got a lot closer. OOT by tenths, not several thousandths.

I was fiddling with my settings for the linear open scan, variable. More hits. Also I changed my Exec Controls from NORMAL to RELEARN. Deviation is 000.
After changing back to NORMAL, scan is in tolerance, deviation of .00013.

This is too good to be true, isn't it? I was under the impression that RELEARN makes the program learn the vectors during each execution. Did I accidentally reset my nominals when I did this? Is that even possible when using a model? Getting more confused...
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