Numerical control (NC), i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form (G05B 19/418 takes precedence) [2013???01]G05B 19/182. . . {characterised by the machine tool function, e.g. thread cutting, cam making, tool d