Filter and other options in evaluation.

[[K...]]

I defined a circle Ø160 on machined bore, and reported roundness 0.088, but when I checked roundness by Marposs gauge, it measured 0.027.

Should I have to use filter and other options in evaluation.

[[Ma...]]

Yes, as a general statement. Applying the circular algorithm LSQ, MI, MC, etc… is something else to consider 

[[K...]]

Should I have to use filter and Outlier Elimination options in evaluation"?

[[Ün...]]

Yes, you should use filters and outliers.
Also, devices that measure with 2 opposing pins, such as Marposs, usually show low roundness values.
This varies depending on the processing method of the part

[[K...]]

Thank you very much