The Taylor parameters for a specific tool be n = 0.5 and C = 400 m/s. What is the percent increase in too life if the cutting speed is reduced by (a) 50% and (b) 75 %? Problem 2 Consider turning a high-strength cast-iron rod whose diameter is 200 mm. The rod is turned on a lathe machine at a depth of cut of d = 1.25 mm. The lathe is equipped with a 12-kW electric motor whose efficiency of 80%. The spindle speed is 500 RPM. Estimate the maximum feed that can be used on this machine before the lathe stall (i.e., jams/stops). The cutting energy of high-strength cast-iron is 3.3 W- s/mm.