Waviness
This is usually produced by instabilities in the machining process, such as an imbalance in a grinding wheel, or by deliberate actions in the machining process. Waviness has a longer wavelength than roughness which is superimposed on the waviness.
It should be noted that there are no guidelines that indicate when wavelength can be considered to be waviness. On optical components, the considered waviness wavelength may be equal to the roughness wavelength on an automotive component.
Waviness Filter
A filter that separates roughness from waviness to leave the waviness profile for analysis.
