Estimate the remaining life in revolutions of a 02-30 mm angular-contact ball bearing already subjected to 216000 revolutions with a radial load of 15 kn, if it is now to be subjected to a change in load to 25.05 kn. note: this is a multi-part question. once an answer is submitted, you will be unable to return to this part.

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.