Mild steel is being machined at a cutting speed of 200 m/min with a tool of rake 10o. The depth of cut and uncut thickness are 2 mm and 0.2 mm, respectively. Average value of the coefficient of friction between tool and chip is 0.5 and shear stress `tau_s`of the work material is 400 N/mm2. Use 2`phi+lambda-alpha` = 90o.
The shear angle is
24.7o
36.7o
35.7o
38.9o