Example: $1)$ Grinding operation is carried out at cutting speed of $25\backslash (\backslash$mathrm$\{$m$\}/\backslash$mathrm$\{$min$\}\backslash )$ with a depth of cut $0\mathrm{.}05$ mm $.$ The diameter and length of work is $50$ mm and $200$ mm respectively. The total stodk to be removed is $0\mathrm{.}30$ mm $.$ The width of the grinding wheel Is $70$ mm $.$ Determine the machining time for finish grinding operation.