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The following data refers to an orthogonal machining of mild steel with a single point HSS tool. Rake angle of tool = 100, uncut chip thickness = 0.3m, width of cut = 2.0mm, single plane shear angle= 360, shear strength of mild steel = 450 MPa, using Merchants analysis

i) the coefficient of friction between the chip and tool will be

(a) 0.141

(b) 0.344

(c) 0.532

(d) 0.688

ii) The shear force in cutting will be

(a) 270 N              (b) 333.75 N

(c) 450 N               (d) 459.34 N.

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