Speaker voicecoil winding

[rjb]

I'm making an experimental speaker using a (modified) existing magnet and chassis, but am having problems working out the best way of winding the voice coil. Unfortunately I have never seen a commercial winder of voice coils.

I have wound numerous transformers using a small hand winder, and propose using this. The winder has a wooden spindle as a former support clamped between two bearing plates.The preformed transformer former slides onto this spindle and held by wedges. Then the coil is wound on this. Removal of the coil and former is therefore easy, and making different spindles to match different transformer sizes is not a problem.


However in making a voice coil, first the former must be wound on a round spindle, then the coil added on top. I am concerned that if I use a simple tube spindle, the completed voicecoil will be too tight to slide off the spindle. However I cannot think of a suitable way of releasing the pressure on the tube when winding is finished, while keeping it circular and accurate in diameter for the actual winding process.

Has anyone had any experience in this?

[Magura]

There is a real simple solution for this. Make the former of PE (polyethylene) tube, use epoxy for impregnating the finished coil. When the epoxy is cured, you heat the whole shebang to like 125C. and the PE tube will become soft enough to be removed easily. Now you got a very light voicecoil that you can mount on whatever you please

Magura

[rjb]

Excellent. Just what I wanted to know. Thanks Magura.

Ross