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 8 hours 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 7 hours 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?

[[Pe...]]

I've seen calypso make some pretty funny shapes when a hole is so far from where it should be.  Looking at your X and Z.

[[Mi...]]

Is there a loose/damaged component? The low form error is confusing, though. Does it have something to do with the fact that it's labeled a cylinder but has the circle symbol in the feature window? Seems like there was some tinkering with that feature at some point. I agree with the previous replies about shanking and burrs but I'd think the form error would be higher, even with filtering. I've seen something similar to that caused by a cracked (off brand) carbon fiber extension. The crack was causing the extension to flex more one way than the other and the result was similar to what you have pictured.

Edited 3 hours ago
More information

[[Tr...]]

Had this happen when the hole is small, relative to probe, and out of expected position.