is the process of machining using cutting tools to progressively remove material by advancing a cutter into a workpiece, and produce a custom-designed part. Automated control of machine tools is enabled by using a prepared software program. CNC milling provides greater efficiency, accuracy and uniformity. This technology is applied to a wide range of materials. Equipment includes Vertical Machining Centers (VMC) and Horizontal Machining Centers (HMC) capable of true fourth axis milling.