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For an orthogonal cutting operation, the tool material is HSS, rake angle is 22°, chip thickness is 0.8 mm, speed is 48 m/min, and feed is 0.4 mm/rev. The shear plane angle (in degrees) is

1. 19.24
2. 29.70
3. 56.00
4. 68.75

Correct answer: 68.75

Solution

The chip ratio is obtained from the uncut and chip thicknesses, and then the shear angle is found using the orthogonal cutting relation. Substituting the given values leads to a shear plane angle of about 68.75°. Hence the correct option is 68.75°.

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