Down Milling (Climb Milling)
In Down Milling the direction of cutter rotation is same as the direction of work piece movement (i.e. direction of feed).
In Down Milling the maximum thickness of chip is at the beginning of cut and a zero thickness at the end of cut.
In climb milling cutting force is directed downwards and this tends to pull the job.
In climb milling better surface finish can be obtained.