They can realize automatic control.They can finish all kinds of turning inwhirling surfaces automaticiy such as the inner circle and excircle of hardwares, end surface kerbens,any conical surfaces and spherical surfaces.They also can complete many manufacturing procedure,including all kinds of metric syetem and British measurement columns and taper screw threads etc.At the same time,they have the self-contained function of S.T.M and can send out and receive many kinds of informations,control the process of automatic machining.