Milling is a machining process that uses a rotating cutting tool to remove material from a workpiece. There are two main types of milling: conventional up milling where cutting engagement is not affected by workpiece surface characteristics, and climb down milling where downward forces hold the workpiece in place but requires a rigid setup. Proper clamping, tool engagement, workpiece material, and machine setup are important factors to consider for optimal milling results and tool life.
13. Conventional Milling (Up Milling)
Max chip thickness is at the end of the cut
Advantage: tooth engagement is not a function of workpiece surface characteristics, and
contamination or scale on the surface does not affect tool life.
Cutting process is smooth
Tendency for the tool to chatter
The workpiece has a tendency to be pulled upward, necessitating proper clamping.
14. Climb Milling (Down Milling)
Cutting starts at the surface of the workpiece.
Downward compression of cutting forces hold workpiece in place
Because of the resulting high impact forces when the teeth engage the workpiece, this
operation must have a rigid setup, and backlash must be eliminated in the table feed
mechanism
Not suitable for machining workpiece having surface scale.