A sandstone bed with RQD 5 70% and g 5 26.0 kN/m3 lies beneath 1.5 m of overburden soil. A 2.0 m 3 2.0 m square foundation is to be placed on top of the sandstone rock (i. e., at a 1.5 depth below the ground level) to carry a column load. The unit weight of the soil is 18.0 kN/m3. Assuming the rock strength parameters from Problem 7.17

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.