Your opinion, please

[[To...]]

I have my thoughts on what is going on with this circle, but I'd like to hear what you all think.

[[Ch...]]

i've seen this once or twice before, I think I recall it was a hole and something was causing probe to shank, or it was really out of round ,etc.

[[Ja...]]

I suspect similar to Chris - probe shanking out, an out of round hole or a burr, or a combination of all three.

[[Ke...]]

I see this a lot, when I am measuring a small internal diameter with a "not small enough" stylus. 

e.g.: inspecting a 4mm dia hole with a 3mm stylus. After I use a 2mm or 1.5mm stylus, the geometery looks good; but the values are no different than the larger stylus

Edited 1 hour ago

[[To...]]

The thing that puzzles me is the low form value. 

[[Du...]]

Do you have Magnification for the feature on?

[[Ch...]]

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I'm with you, what's up with the good form value?  Looks heavily filtered.  I'd look at the unfiltered data and check difference been min circumscribed and max inscribed. 

[[To...]]

No mag. No filters or outliers. Not sure why scanning 750 degrees. LSQ. Haven’t checked mask settings. 

Edited 58 minutes ago

[[Ch...]]

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something is masking out points.  its set to 1048 points but only 462 are used for the evaluation.  

 

[[Ke...]]

Try taking discrete points... maybe a dozen or so?