Table 3.

Surface Roughness (Ra) Experimental Results.

Experimental serial number	Speed of cut V (m/min)	Feed rate f	Depth of cut a (mm)	Surface roughness Ra (μm) Mean	Ra S/N (um)
1	SO	0.05	0.2	0.703333	3.0568
2	80	0.10	0.4	0.166667	15.5630
3	80	0.15	0.6	0.690000	3.2230
4	100	0.05	0.4	0.446667	7.0003
5	100	0.10	0.6	0.630000	4.0132
6	100	0.15	0.2	0.193333	14.2739
7	120	0.05	0.6	0.693333	3.1812
S	120	0.10	0.2	0.126667	17.9468
9	120	0.15	0.4	0.070000	23.0980