EBD coil-winding machines control wire tension to 0.1 gm and handle wire filaments to 0.0004-in. diameter and smaller. Mandrel wires on which the filaments wrap can be as small as 0.001-in. diameter.

Precision spring manufacturing has never been exact because of the inconsistencies in the wire feed stock and normal wear that occurs in the forming tool. But the Spring Technologies division of Reell ...