This document summarizes an experiment that optimized cutting parameters for dry turning of mild steel. 27 turning experiments were conducted using Taguchi's L27 orthogonal array to examine the effects of depth of cut, feed rate, and spindle speed on surface roughness. Analysis of variance found that depth of cut was the only significant factor. The optimal parameters to minimize surface roughness were a depth of cut of 0.5mm, feed rate of 0.02mm/rev, and spindle speed of 25.12rpm. These results show that depth of cut has the greatest influence on surface roughness in dry turning of mild steel.