A cylinder is turned on a lathe with orthogonal machining principle. Spindle rotates at 200rmp. The axial feed rate is 0.25mm per revolution. Depth of cut is 0.4mm. the rake angle is 100. In the analysis it is found that the shear angle is 27.750.
i) the thickness of the produced chip is
(a) 0.511mm
(b) 0.528mm
(c) 0.818mm
(d) 0.846mm
ii) in the above problem, the coefficient of friction at the chip tool interface obtained using Earnest and Merchant theory is
(a) 0.18 (b) 0.36 (c) 0.71 (d) 0.98