Table 3.

Factors and levels considered in the design of experiment.

Study Factor		Levels					Units
		F1	F2	F3	F4	F5
RE	Area	0	11.05	11.57	11.7	13	mm2
	Depth	0	0.006	0.014	0.019	0.027	mm
Control Factor		Levels					Units
		R1		R2	R3
Regime		200		350	500		rpm