The CNC milling process employs horizontal or vertical CNC-enabled milling machines—depending on the specifications and requirements of the milling application—and rotating multi-point (i.e., multi-toothed) cutting tools, such as mills and drills.
Once the CNC milling process is initiated, the machine begins rotating the cutting tool at defined speeds. These speeds are often decided by the material type, as different density materials will require different cutting speeds
Dependant on the type of machine, and the complexity of the final component required, the machine will move the tools or material in different ways:
- The tools remain stationary (but rotating at speed) and the workpiece is moved to the tool
- The workpiece remains stationary and the rotating tools move to cut away the material
- Both the tools and the workpiece move in relation to each other.
This milling process gradually removes material to form the desired shape and form of the part. On the first operation, the tools cut small pieces off the workpiece to form the approximate shape required. Then, the workpiece undergoes the milling process at much higher accuracy and with greater precision to finish the part with its exact features and specifications.