Optimizing Cutting Conditions for Minimum Surface Roughness in Face Milling of High Strength Steel Using Carbide Inserts

Table 2

The cutting parameters and their levels used in the factorial design experiment.

Designation	Process parameter	Level 1	Level 2	Level 3	Level 4
	Spindle speed (rpm)	500	750	1000	1250
	Depth of cut (mm)	0.25	0.50	0.75	1.00
	Feed rate (mm/min)	50	75	100	125