Curves/filters

[[Cl...]]

I'm using a 2d curve to get a minimum point. The curve (about a 30deg arc) is on an OD with a smaller ID (dip) in the center. I was using the default filter settings which are; GUASS, Wavelength Lc 1.0000mm. The number I was getting didn't jive with the offset made at the machine, so I tried a few different things to see what might be causing the problem. I switched the filter setting to Spline, and my number now reflects the offset made. My question is how does the filter setting affect the result?

[[Ch...]]

I know that gauss filters work better on closed ended curves such as circles. Gauss does not work as well for open ended loops such as planes or lines.

I use spline for all of my open ended curves.

[[Me...]]

I took a Curve refresher coarse last summer and I believe they told us to use Spline but I do not remember the reasons why...

[[Cl...]]

Thanks fellas. You would think that when using a specific
feature, or curve type, the software would detect that and
apply the correct setting?

[[An...]]

The Gauss filter requires a leading and trailing motion, therefore closed circles must be measured with a larger angle!
The spline filter intervenes immediately, does not require any forward or backward motion and thus filters the entire measuring path, even if it is interrupted or shortened!
If a circle with 360 degrees is measured and the Gauss filter is used, only about 340 degrees are filtered, with the Spline filter the whole 360 degrees are filtered.

That's how it was explained to me!