A MS billet 160 mm diameter was turned with an HSS tool at 30 m/min. The tool life under this condition was observed to be 2.1 hours. At the cutting speed of 25 m/min, the tool life was observed to be 5.2 hours. The Taylor's constant 'C' is
A
38.4
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B
66.95
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C
79.3
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D
95.15
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Solution
The correct option is C 79.3 For HSS tool V1=30 m/min T1=2.1 hours =2.1×60=126 min V2=25 m/min T2=5.2 hours =5.2×60=312 mins