Fig. 5

Main effects plot for flank wear (VB). In the plots, the x-axis indicates the value of each cutting parameters (v, f, d) at three level and y-axis the response value (here, flank wear). Horizontal line indicates the mean value of the response. The main effects plots are used to determine the optimal design conditions to obtain the optimum value of flank wear. The main effect plot in Fig. 5 indicates that, flank wear increases with cutting speed (v), feed (f) and depth of cut (d)