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What is the approximate% change in the life, f, 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 wear rate is proportional to cotα)
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- 30% increase
- 30% decrease
- 70% increase
- 70% decrease
- 30% increase
Correct Option: B
Wear rate is proportional to tanγ, i.e. Wear rate ∝ tanγ
Where, γ = Clearance angle
When clearance angle is decreased from 10° to 7°, then
| percentage change in f = | × 100 = 30.37% decrease. | |
| tan10° |
