Take a steel rod, wrap it into a spiral shape, throw some engineered heat-treating in the mix, and you've got yourself a coil spring. That spring can be used as part of your suspension to support the ...
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.