During the above operation, the drill wears out after producing

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Direction: Blind hole 10 mm diameter, 50 mm deep are being drilled in steel block, drilling spindle speed is 600 rpm, feed 0.2 mm/rev, point angle of drill is 120.

During the above operation, the drill wears out after producing 200 holes.Taylor's tool life equation is of the form VT^0.3 = C, where V = cutting speed in m/min and T= tool life in min. Taylor's constant C will be

1. 15
2. 72
3. 93
4. 490

Correct Option: B

VT0.3 =C
No of holes = 200

V =	πDN	= 18.84 min
	60

Tool life = 200×0.442 = 88.33 min
18.84 × 88.330.3 = 6 = 72.26.