digital metrology notepad series specifying waviness

Most of us ride roller coasters for the thrill of the hills and dips, rather than the clack of the coaster's parts (wooden coaster enthusiasts may take exception!). We can think of the hills as the "waviness" of the coaster moving our entire body through the ride; and the mechanical clunks and bumps as the "roughness" that rattles our heads.
In a similar way, if we are controlling sealing in gaskets, or noise in bearings and gears, the longer-wavelength waviness may be more important than the surface roughness.
In this video we look at how we extract waviness from surface texture data, using a "cutoff wavelength" to determine what we call waviness and what we call roughness for our application. We also show how to specify waviness on a drawing so that we can measure and control it in production.