I program and manage CNCs for a living. They are subtractive: they remove material; they don't add it. The abbreviation is not merely literal; its used to den

I program and manage CNCs for a living. They are subtractive: they remove material; they don't add it. The abbreviation is not merely literal; its used to denote machining. You could call a 3-D printer a CNC, but they're not actually called that.