Torsion Spring Winding Jig

Using drill bits as a commonly available steel mandrel, for winding torsion springs


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Half of this jig goes into a small bench vise for holding the mandrel, the other half goes over the top to use as the winding crank. Both sides use an insert to hold an appropriate size drill bit so that the non-fluted area on the shank can be used to wind the spring.

You'll need to use a spring mandrel calculator such as to calculate what size drill to use for a given wire and spring finished size, which will probably result in some fussing with whatever design you're using a custom spring in, since your mandrel sizes will be limited by your available round-things stock.

Dimensions for the inserts are included in the PDF so that you can make whatever size you need on whatever CAD program. Tolerances are not particularly close, everything is more or less a loose fit except the vise side insert, which needs to be tight enough to clamp down on the mandrel.

Materials and methods

I've used PETG with success, but this would probably work on any material.

I've wound up to 0.062" music wire, but that was trivial and well under the maximum capability of the jig.



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5cee56bd209defb1b071e86fcc5b2eb7?default=blank&size=40SomeOtherDude published this design ago