Effect of resultant force direction in single point diamond turning of (111)CaF2

Abstract

On-axis single point diamond turning experiments were performed on (111)CaF₂ to investigate the effect of the resulting force system on the single crystal response. The cutting and thrust forces were measured and the resulting surface topography was characterized. The Schmid factors and fracture factors were calculated, and their ratio ${\left(\frac{S_f}{F_f}\right)}^{*}$was determined as a function of cutting direction and resultant force angle. It was found that this approach can be used to predict the number and location of resulting fracture lobes on the surface with respect to the lattice orientation. Two regimes with different topography were predicted when turning (111)CaF₂, depending on the resultant force angle.