Example

A peripheral milling operation is performed on a rectangular workpiece that is $320$ mm long by $60$ mm wide by $56$ mm thick. The $65-$mm$-$diameter milling cutter has $4$ teeth, is $80$ mm long, and overhangs the work on either side by $10$ mm $.$ The operation reduces the thickness of the piece to $50$ mm $.$ Cutting speed $=0\mathrm{.}50\frac{m}{s}$ and chip load $=0\mathrm{.}24mm/$tooth$.$ Determine: $($a$)$ The machining time;

$($b$)$ Material removal rate once the cutter reaches full depth.