A CNC milling machine is a core piece of equipment that utilizes computer numerical control to guide a rotating, multi-edged cutter for high-precision, automated material removal from a workpiece; it is primarily used to machine flat surfaces, grooves, contoured surfaces, and parts with complex 3D profiles.
The machining accuracy of CNC milling machines typically reaches 0.01 mm. Surface roughness varies according to the machining stage: Ra 5–20 μm for rough milling, Ra 2.5–10 μm for semi-finish milling, and Ra 0.63–5 μm for finish milling. Driven by technological advancements, CNC milling machines are evolving toward higher speeds and greater precision; under high-speed trends, spindle speeds can reach 200,000 rpm, and feed rates can reach 240 m/min.
