Determine the machining time for turning a shaft from diameter $70$

mm to $64$ mm over a length of $200$ mm at n $=600$ rpm and s $=0\mathrm{.}4$

mm$/$rev$.$ The turning tool has principal cutting edge angle f $=45\backslash$deg $.$

Consider approach and over travel as $2$ mm$.$ Depth of cut is $0\mathrm{.}5$ mm$.$