Roughness models for sanded wood surfaces by Tan, P. L., Sharif, Safian, Sudin, Izman

“…Four available roughness parameters (R a , R q , R k and R ap) were used to examine the surface of three distinct wood species, viz. kembang semangkok, red oak and spruce in wide-belt sanding. Based on the mean values, analysis of variance showed that species (anatomy) was significant to all conventional parameters except R ap which was filtered by monitoring the second derivative of Abbott-curve. …”