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http://www.gcstamping.com/cnc-milling-parts/
Milling refers to cutting workpieces with rotating multi-blade tools and is an efficient machining method. During work, the tool rotates (for the main movement), the workpiece moves (for the feed movement), and the workpiece can be fixed, but at this time, the rotating tool must also move (to complete the main movement and feed movement). Milling machine tools include horizontal or vertical milling machines, as well as large gantry milling machines. These machine tools can be ordinary machine tools or CNC machine tools. Cutting with a rotating milling cutter as the tool.