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In orthogonal turning of low carbon steel pipe with principal cutting edge angle of 90°, the main cutting force is 1000 N and the feed force is 800 N. The shear angle is 25° and orthogonal rake angle is zero. Employing Merchants theory, the ratio of friction force to normal force acting on the cutting tool is
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- 1.56
- 1.25
- 0.80
- 0.64
Correct Option: C
Here, φ = shear angle = 25º
λ = Friction angle,
α =rake angle = 0º
From Merchant’s theory, 2φ + λ − α = 90º
∴ λ = 90º – 50º = 40º
| ∴ μ = | = | = tan λ = .83 | ||
| N | Normal force |
