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Better surface finish is obtained with a large rake angle because
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- the area of shear plane decreases resulting in the decrease in shear force and cutting force
- the tool becomes thinner and the cutting force is reduced
- less heat is accumulated in the cutting zone
- the friction between the chip and the tool is less
Correct Option: A
As rake angle increase shear plane decreases so smaller force one required so smooth machining operation
tan Φ = | Favourable machining | 1 - r sin α |
condition Φ ↑α↑r↑