CK61100E/125E/140E/160E series large CNC lathes have semi-closed-loop control function. Suitable for processing various complex shapes of shafts, sleeves, disc parts, such as turning inner and outer cylindrical surface, conical surface, arc surface, end face, grooving, chamfering, turning thread, etc., spindle diameter is large, by precision heavy-duty bearing as three-point support, stable rotation, can be both heavy cutting and fine turning; Stepless variable speed and constant line speed cutting can be realized.