The following data are obtained during orthogonal machining with Merchants theory.
Ultimate shear strength of work material = 600 MPa,
Rake angle of the tool =6∘,
Coefficient of friction at chip tool interface =0.2,
Feed and depth of cut = 0.2 mm/rev and 3 mm respectively. Taylor's tool life equation is V.T0.4=100.
What is the Optimum cutting velocity during machining if machine hour rate is Rs. 75 and cost of regrinding the tool one time is Rs. 15?