Machined springs provide linear deflection rates and, unlike traditional wire wound springs, virtually all residual stresses are absent. There are no internal stresses to overcome before deflection occurs. All coils deflect under load.
Machined springs with two or more integral coils have redundant elastic elements should a failure occur, and the failed coil will be physically trapped by a second coil (or multiple coils). In many cases, a broken spring will continue to function.
With machined springs, perpendicularity, parallelism, lateral bending, and axial and torsional rates are guaranteed.
Helical Products Co. Inc., Box 1069, Santa Maria, CA 93456, (877) 353-9873, www.heli-cal.com