Q$.8$ Experiments were conducted for determination tool life on the basis of wear land criterion and

results obtained are written as per following table. The feed and depth of cut used were $0\mathrm{.}3m\frac{m}{r}ev$ and $3\mathrm{.}0$

mm $,$ respectively. Further it has been found that uniform wear land is varying linearly between $10$ min time

and $60$ min time.

I. Determine the tool lives for both cutting speeds using $1\mathrm{.}75$ mm uniform flank wear criterion

II$.$ Determine the values of n and C in the Taylor's tool life equation

III. Calculate the tool life for cutting speed of $155\frac{m}{m}in$