What is CNC? How CNC Machines Work

What the video shows

What CNC (computer numerical control) is and how a CNC machine turns a drawing into a part, in 8:15. From punched-tape NC to computer CNC; the control chain: CAD → CAM → G-code → CNC controller → interpolator → servo drive → motor → axis. Interpolation turns the path into a position target for every axis in every cycle (at 6 m/min the tool moves 0.1 mm per 1 ms); the servo drive compares the target with the encoder position and corrects the following error with position, speed and current loops. 3-, 4- and 5-axis machines and RTCP; milling machines, lathes, routers, plasma, laser, waterjet, punch presses and wire EDM; the parts of a machine tool; resolution vs repeatability vs accuracy; real time and jitter in PC-based CNC. A 139,882-line 5-axis turbine program from an ONX X CNC Library lab test (virtual axes) and the free DXF to G-code converter.