The cutting speed is the distance travelled by a point on the outer surface of the work in one minute. It is expressed in meters per minute.
The feed of a cutting tool in a lathe work is the distance the tool advances for each revolution of the work. Feed is expressed in millimeters per revolution.
Depth of cut
The depth of cut is the perpendicular distance measured from the machined surface to the uncut surface of the workpiece. It is expressed in millimeters.
In a lathe, the depth of cut is expressed as follows