A metal plate 200 mm in length, 150 mm in width, and 20 mm in depth is to be machined by orthogonal cutting using a tool of width 10 mm and a depth of cut of 0.5 mm. Estimate the minimum time required to reduce the depth of the plate to 10 mm if the tool moves at 50 mm per second. Note that the width and length of the plate must remain the same.

Aturning operation is performed with following conditions: rake angle of 12°, a feed of 0.35 mm/rev, and a depth of cut of 1.1 mm. the work piece is aluminum alloy 6061 with t6 heat treatment (a16061-t6). the resultant chip thickness was measured to be 1.0 mm. estimate the cutting force, fc. use shear stress of 207 mpa and coefficient of friction on the tool face of 0.6.