Depth Of Cut; Direction Of Cutter Rotation - CHESTER Cobra Mill Instruction Manual

5.3. Depth of Cut
Depth of cut is directly related to the efficiency of the cutting process. The deeper the cut the faster will
be the production rate. Yet, it still depends on the strength of the cutter and the material to be cut.
For a certain type of cutter, a typical range of cut will be recommended by the supplier. Nevertheless, it
should be noted that a finer cut is usually associated with a better surface finish as well as a long tool
life.
5.4. Direction of Cutter Rotation
a. Up Cut Milling
In up cut milling, the cutter rotates in a direction
opposite to the table feed as illustrated in figure
14. It is conventionally used in most milling
operations because the backlash between the
leadscrew and the nut of the machine table can
be eliminated.
b. Down Cut Milling
In down cut milling, the cutter rotates in the same
direction as the table feed as illustrated in figure
15. This method is also known as Climb Milling
and can only be used on machines equipped
with a backlash eliminator or on a CNC milling
machine. This method, when properly treated,
will require less power in feeding the table and
give a better surface finish on the workpiece.
Figure 14. Up Cut Milling
Figure 15. Down Cut Milling