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A single-point cutting tool with 12° rake angle is used to machine a steel work-piece. The depth of cut, i.e. uncut thickness is 0.81 mm. The chip thickness under orthogonal machining condition is 1.8 mm. The shear angle is approximately
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- 22°
- 26°
- 56°
- 76°
Correct Option: B
Relation between shear angle (φ), chip thickness ratio (r) and rake angle (α) is given by
| tan φ = | |
| 1 − rsinα |
| where, r = | = 0.45 | |
| 1.8 |
| tan φ = | |
| 1 − 0.45sin12 |
⇒ φ = 26°
