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Surface Profile - Iterate and Repierce function

Can someone give me a rundown of what the iterate and repierce function does? I turn it on and all of a sudden my surface profile improves significantly. Is that real?

On a similar topic, has anyone else had trouble with vector least square best fit causing a best fit error? I have had several parts now that had profile dimensions set to vector best fit, which runs fine offline, that have given me best fit errors at the end of the program. If I hunt down the offending dimension and change it to least squares the error goes away immediately. I have also had a similar problem if I set the iterate and repierce function with too small of a tolerance. I'm using an .039 (1mm) ruby and have found I need to set the repierce tolerance to at least .025 to reliably run through the program without any best fit errors. This seems to be related to features with very large radiuses of contour (almost flat, but not quite). My assumption is that the math runs out to too many decimal places and it can't handle it.

Thanks for any advice. I am inspecting a part that is just one giant contour, no flats at all, and need to have all of my ducks in a row around how all of the surface profile options work.
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  • I'd like to bump this thread as I have a part where this "Iterate and repierce CAD" is available as an option for my form only surface profile. Like DaSalo above, this did wonders to some of my form only profiles, where the result without it activated showed 0.0565 mm and the result with it activated gave 0.0146 mm (!). That is some serious improvement, which makes me question the first result...

    Were the actual measurement so "off" from the CAD surface that it measured it that bad? I mean, with a form only surface it should make the necessary best-fits automagically? Shouldn't this "iterate and repierce" be included in that calculation? Now it only adds to the confusion "Am I allowed to use this?" and "Should I use it?". Like I said, some form only evaluations are improving significantly from it.
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  • I'd like to bump this thread as I have a part where this "Iterate and repierce CAD" is available as an option for my form only surface profile. Like DaSalo above, this did wonders to some of my form only profiles, where the result without it activated showed 0.0565 mm and the result with it activated gave 0.0146 mm (!). That is some serious improvement, which makes me question the first result...

    Were the actual measurement so "off" from the CAD surface that it measured it that bad? I mean, with a form only surface it should make the necessary best-fits automagically? Shouldn't this "iterate and repierce" be included in that calculation? Now it only adds to the confusion "Am I allowed to use this?" and "Should I use it?". Like I said, some form only evaluations are improving significantly from it.
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