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

Table 3

Input variables and levels.

Symbol	Variable	Levels	1	2	3
Vc	Cutting speed, m/min	3	320	450	575
F	Feed rate, mm/rev	3	0.1	0.18	0.26
T	Tool type	2	Coated	Uncoated	—