Optimization of Surface Quality and Power Consumption in Machining Hardened AISI 4340 Steel

Table 5

S/N response table for R_a and C_p factor.

Levels	Control factors
	Surface roughness (Ra)			Cutting power (Cp)
	A	B	C	A	B	C
Level 1	−0.7921	2.0017	0.1807	−55.33	−52.27	−54.79
Level 2	−3.6907	−2.0042	−2.9526	−54.67	−55.68	−54.93
Level 3		−6.7216	−3.9522		−57.06	−55.29
Delta	2.8985	8.7233	4.1330	0.66	4.79	0.50
Rank	3	1	2	2	1	3