CNC machining is a subtractive manufacturing process. It uses computerized controls and machine tools to remove layers of material from a blank to form a finished piece. The piece to be machined is secured in the CNC machine tool using a jig or work-holding tool. This prevents it from moving around during the machining process.
02 Machining
Three basic types of CNC machining are drilling, milling and turning. For CNC drilling, drill bits are used to make cylindrical holes in the workpiece. Usually, these holes are used for screws or other fasters. CNC milling uses a rotating tool to remove material from the workpiece, often at multiple angles and axes. In CNC turning, material is removed as the workpiece spins on a lathe.
03 Post-Processing
Post processing helps ensure a uniform appearance from part to part. Some CNC machines may leave visible tool marks on the piece after production. Post-processing may include bead blasting to remove tool marks or painting to achieve a desired color. Anodizing or coating may be used to enhance the qualities of the metal or plastic part.
