The automatic spring coiling machine MDC-80 is a straightforwardly designed compact unit for producing Bonnell springs.
The wire, which is fed from the swift, is wound into a spring in four steps. After the coiling process, the springs are placed in the 6 star-shaped conveying arms and are then advanced in increments.
The ends of the springs are knotted on the front into end rings and then heat-treated between two electrodes. This heat treatment at circa 300° C relaxes the spring that has become tense from the coiling process and reduces the setting loss. Finally, the completed springs arrive at the spring offl oad point, where they are uniformly stacked for further processing.