$(30$ Points$)$ A $75$ mm diameter, $15$ mm wide A$80-$M$12$V grinding wheel is used for

traverse surface grinding of a $5050$ mm $1040$ steel workpiece. The workpiece traverse

speed is $1$ mm$/$s$,$ the radial depth of grind is $1\mathrm{.}5$ mm$,$ the $($axial$)$ intermittent cross feed is

$10$ mm$/$stroke$,$ and the wheel surface speed is $314$ mm$/$s$.$

A$)$ Estimate the required amount of grinding time $(10)$

B$)$ Roughness of the ground surface $(10)$

C$)$ The spindle power required $(10)$