Tool life equations for two tools under consideration are

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Tool life equations for two tools under consideration are as follows
HSS: VT^0.2 = 150
Carbide: VT^0.3 = 250
Where V is the cutting speed in m/min and T is the tool life in mm. The breakeven cutting speed above which the carbide tool will be beneficial is

1. 54 m/min
2. 150 m/min
3. 194 m/min
4. 250 m/min

Correct Option: A

HSS:
VT^0.2 = 150
VT^0.3 = 250

	150		^1/0.2	=		250		^1/0.3
	V					V

V = 54m/ min