Question

Two face turning tests are performed to determine tool life equation constants Stainless tube of internal and external dimeters of D1=45 mm, D2=65 mm respectively is used. The first test was performed over 8 facing passes using spindle speeds of N1= 350 rpm, and the second tests was performed over 13 passes using spindle speed of N2=280 rpm. The testes were performed using feed, f=0.1mm/rev. If the flank wear after 8 facing passes of the first test is 0.19 mm, while the flank wear after 13 facing passes of the second test is 0.156 mm. Assuming a certain tool wear criterion (i.e. VB =0.3 mm), determine the tool life constants.

Answer 1