(a) Speed = 3000 RPM; feed rate = 1200 mm/min; depth of cut = 0.3 mm
(b) Speed = 4000 RPM; feed rate = 1600 mm/min; depth of cut = 0.3 mm
(c) Speed = 5000 RPM; feed rate = 800 mm/min; depth of cut = 0.3 mm
Figure 9: Scanning electron micrographs of the machined surface.