Patent ID: 7055244

Claim:
A method of forming a coil spring from spring wire on a rotatable center shaft of a spring coiling machine comprising the steps of: providing a coil of spring wire; attaching an end of a length of the spring wire being unwound from the coil of spring wire to the rotatable center shaft of the spring coiling machine; and winding the spring wire onto the rotatable shaft of the spring coiling machine by varying a rotational speed of the rotatable shaft to form a coil spring formed of a plurality of rings wherein during winding of the spring wire onto the rotatable shaft, the spring wire is pulled into the spring coiling machine at a constant linear speed and each successive outer ring of the coil spring is wound into the coil spring at a rotational speed that is faster that the rotational winding speed of the previous ring, so that each of the plurality of rings is formed at a substantially constant strain rate.