Double-bodied torsion springs are designed using the same methods as for single-bodied torsion springs. The rate for a double-bodied torsion spring is equal to the sum of the rates for each component. For the same wire diameter, coil diameter and wire length, double-bodied torsion springs have rates four times those of single-bodied types. Double-bodied torsion springs should be designed so they are coiled out from the center rather than in from the ends.
While Newcomb Spring can produce double torsion springs in both the preferred wind and the non-preferred wind body shapes, the preferred configuration lowers production costs.
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