A machinability rating is to be determined for the new

A machinability rating is to be determined for the new work material. For the base material (B1112), test data resulted in a Taylor equation with parameters n = 0.29 and C = 490. For the new material, the Taylor parameters were n = 0.23 and C = 430. Units in both cases are speed in m/min and tool life in min. These results were obtained using cemented carbide tooling. 

(a) Compute a machinability rating for the new material using cutting speed for a 30-min tool life as the basis of comparison. 

(b) If the machinability criterion were tool life for a cutting speed of 150 m/min, what is the machinability rating for the new material?



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