There are two distinct ways to cut accoutrements when milling Conventional Milling (Up) and Climb Milling (Down). The difference between these two ways is the relationship of the gyration of the knife to the direction of feed. In Conventional Milling, the knife rotates against the direction of the feed. During Climb Milling, the knife rotates with the feed.

Conventional Milling is the traditional approach when cutting because the counterreaction, or the play between the lead screw and the nut in the machine table, is excluded ( Figure 1). Lately, still, Climb Milling has been honored as the favored way to approach a workpiece since utmost machines moment compensate for counterreaction or have a counterreaction eliminator.

conventional milling

Crucial Conventional and Climb Milling Properties

Conventional Milling ( Figure 2)

Chip range starts from zero and increases which causes further heat to verbose into the workpiece and produces work hardening

Tool rubs more at the morning of the cut causing briskly tool wear and decreases tool life

Chips are carried overhead by the tooth and fall in front of knife creating a marred finish andre-cutting of chips

Overhead forces created in vertical milling * tend to lift the workpiece, more intricate and extensive work effects are demanded to lessen the lift created *

conventional milling

Climb Milling ( Figure 3)

Chip range starts from maximum and decreases so heat generated will more likely transfer to the chip

Creates cleaner shear aeroplane which causes the tool to rub lower and increases tool life

Chips are removed behind the knife which reduces the chance of recutting

Down forces in vertical milling is created that helps hold the workpiece down, less complex work effects are need when coupled with these forces

Vertical milling is when the center line of the tool is resemblant to the work piece

rise milling

When to Choose Conventional or Climb Milling

Climb Milling is generally the stylish way to machine corridor moment since it reduces the cargo from the cutting edge, leaves a better face finish, and improves tool life. During Conventional Milling, the knife tends to dig into the workpiece and may beget the part to be cut out of forbearance.

Still, however Climb Milling is the favored way to machine corridor, there are times when Conventional Milling is the necessary milling style. One similar illustration is if your machine doesn't offset counterreaction. In this case, Conventional Milling should be enforced. In addition, this style should also be employed on casting, forgings or when the part is case hardened (since the cut begins under the face of the material).

To know more knowledge about CNC milling, read this article - An Article Help You Distinguish Climbing Milling and Up Milling.