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In an orthogonal machining with a tool of 9° orthogonal rake angle, the uncut chip thickness is 0.2 mm. The chip thickness fluctuates between 0.25 mm and 0.4 mm. The ratio of the maximum shear angle to the minimum shear angle during machining is______.
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- 1.487
- 1.499
- 1.494
- 1.490
Correct Option: C
Given α = 9°
t = 0.2 mm
t c max = 0.4 mm
tcmin = 0.25 mm 
or Φmin = 28.18°
| Ratio = | = | = 1.494 | ||
| Φmin | 28.18 |
