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What is the approximate % change in the life, t, of the tool with zero rake angle used in orthogonal cutting when its clearance angle, α, is changed from 10 to 7 deg?

(Hint: flank were rate is proportional to cot α)

(a) 30% increase                          (b) 30% decrease

(c) 70% increase                          (d) 70% decrease

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