Machining Time in Milling:
Let a workpiece of length 'l' milled through a slab milling (arbor mounted milling cutter, Figure) by using a cutter of diameter 'D' and depth of cut'd'. After that the distance to be traversed through the milling cutter is equivalent to (l + 2 Ap) where 'Ap' is called as approach over-run allowance. This is taken at entry along exit side of the cutter. From the geometry provided in Figure 6,
Figure : Slab Milling
In case of face milling operation, two following cases arise :
