Climb Milling vs Conventional Milling

Conventional milling is the traditional approach when cutting because the backlash, or the play between the lead screw and the nut in the machine table, is eliminated. Recently, however, climb milling has been recognized as the preferred way to approach a workpiece due to the fact that more and more machines compensate for backlash or have a backlash eliminator.

Conventional Milling:

    •Chip width starts from zero and increases which causes more heat to
     diffuse into the workpiece and produces work hardening
    •Tool rubs more at the beginning of the cut causing faster tool wear
     and decreases tool life
    •Chips are carried upward by the tooth and fall in front of cutter
     creating a marred finish and re-cutting of chips
    •Upwards forces created in horizontal milling tend to lift the workpiece,
    more intricate and expansive work holdings are needed to lessen the
     lift created

Climb Milling:

    •Chip width starts from maximum and decreases so heat generated
     will more likely transfer to the chip
    •Creates cleaner shear plane which causes the tool to rub less and
     increases tool life
    •Chips are removed behind the cutter which reduces the chance of re-
     cutting
    •Downwards forces in horizontal milling are created that help hold the
     workpiece down — less complex work holdings are need when coupled
     with these forces