AN INVESTIGATION INTO DIMENSIONAL ACCURACY AND SURFACE FINISH ACHIEVABLE IN DRY TURNING

This paper presents experimental and analytical results of an investigation into dimensional accuracy and surface finish achievable in dry turning. The Taguchi method and Pareto ANOVA analysis are used to determine the effects of the major controllable machining parameters, viz. cutting speed, feed rate and depth of cut, on three key quality characteristics, viz. diameter error, surface roughness and circularity, and subsequently to find their optimum combination. The work and tool materials selected are alloy steel AISI 4340 and enriched cobalt-coated carbide, respectively. The results indicate that while the surface roughness can be optimized through proper selection of feed rate, optimization of diameter error and circularity is difficult due to complex interactions between the input parameters.