Early spring, special-shaped spring and complex torsional spring production has been half of the mechanical hand or even full manual mode, appear NC Octopus machine, this problem has been very good improvement. Any complex spring can be decomposed into a round, arc, angle and line four basic structures, the one-time forming complex spring become possible. The first CNC machine only two, later in development, gradually from the 2 axis until the 13 axis, which can be divided into core and a fixed core shaft, rotating line and not turn in line, cam and cam, direct drive without fixed sliding seat and a movable slide four categories, the cam is divided into direct drive and cam lever drive, no cam is divided into the axial feed and eccentric feed. CNC machine is the biggest characteristic of the interaction between different machines shaft and any combination of the above four kinds of structure.