Or Electrical Discharge Machining. With accuracies of +/-.0001". Place I worked in recently had an EDM CNC machine. Was baffeled as to what it was until the owner explained. In simple terms its a band saw that uses a coil of brass wire as the blade and cuts under water or ionised fluid. See it in action... His facility has about 15 high tech cnc machines. I built him two huge concrete plinths to carry two heavy machines.
Preferably underwater too. Which leads nicely to,,,,,,,, How do you stop Ryluer drowning?? ,,,,, Take your foot off his head.
Not only a superb machine but a super bloke and company too, giving away the book and information via there website. , not many like that about their days.