Cutting speed feed and depth of cut of slotter machine

Cutting speed :

The rate at which the metal is removed during downward cutting stroke is called cutting speed.
It is expressed in meters/minute. 

Feed :

A feed is the movement of the work per double stroke. 
It is expressed in mm.

Depth of cut :

Depth of cut is a perpendicular distance measured between the machined surface and un-machined surface also.
It is expressed in mm.