CNC Lathe & Mill, Basic Operation
CNC means computer numeric control. Once upon a time there was a paper tape numeric control, and before that there were analog controls (meaning wheels & knobs) hense the name evolution.
3 minute video of CNC Lathe in operation: In video the stub to left is spinning and the tools work on it. All is controlled by computerized motors and actuators.
3 Minute GoPro video of CNC Mill in operation: A mill spins a cutter while the work piece moves below it. The mill is very similar to a wood router. Mills normally work in 3D. This video shows basic operation of milling, drilling, and threading in aluminum. The fluid is coolant to cool, lubricate and remove chips. It is 92% water.