#### A predictive model of milling surface roughness | SpringerLink

where F is the pressure (which refers to the zdirectional cutting force Fz in the cutting process); and R 1 and R 2 are the radii of the two contacting bodies. In the cutting process, R 1 is the arc radius of the cutter tip and R 2 is approximately infinite. E 1 and E 2 are the elasticity moduli of the cutter and processing materials, respectively, and v 1 and v 2 are the Poisson's ratios ...