Optimisation of Cutting Tool and Cutting Parameters in Face Milling of Custom 450 through the Taguchi Method

Table 5

Response of S/N ratios for surface roughness (R_a).

Control factors	S/N ratios (dB)				Max-min	Order of significance
	Level 1	Level 2	Level 3	Level 4
Ct	5.1028	3.2209	1.8784	1.7280	3.3748	2
Vc (m/min)	4.8568	2.1584	2.4777	2.4372	2.6984	3
f (mm/rev)	5.2176	4.0356	2.3078	0.3691	4.8484	1