In Another Place, I came across the idea of building an open frame dynamo based upon using an armature from a car starter motor or dynamo, casting or fabricating an open frame and winding field coils on wooden formers by hand, perhaps utilising the copper wire already to hand from the donor device. Obviously, there would be a bit more to it than that, but you get the idea.
Bearing in mind that the cost of open frame dynamos these days is creeping ever upwards, it didn't seem like a bad idea.
Any thoughts, pitfalls, difficulties envisaged?
Regards,
Kim Siddorn
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