In cutting operations usually the value of Over-Run is taken as 5 mm.
In facing operation to face the width of job w respective cuts
are required if D(the Diameter of cutter) is less than w(the width
of job). And usually the Approach Length is taken as 0.5 D and
Over-Run as 7 mm in this case.
The facing is done in one cut when D (the Diameter of cutter)
is bigger than w (the width of job).In this case the formula
of Over-Run will be:
Total Time for Milling :
The time for milling the surface relies on the length of job(or workpiece). In the formula
of Total Time for Milling,
Added Table Travel = Approach Length + Over-Run
Length of Cut = Length of job + Added Table Travel
Feed/Rev. = Feed/tooth x Number of Teeths on Cutter
