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Computer numerical control (CNC) refers the automation of manufacturing equipment via computers and numerical based programming code. Used to dramatically reduce the labor component of manufacturing, while increasing accuracy and repeatability, this is one of the great advancements since the industrial age.  When coupled with computer aided design (CAD) and software like SolidWorks, we can greatly reduce sources of human error between engineering and a finished part.  This terminology is applicable to traditional machining equipment such as milling machines and lathes, but also to plasma cutters and water jet tables.