Transformer Winding for Novices.

[Yorkie]

Very interesting John.

I noticed that perhaps in keeping with tradition, he used a micrometer rather than a digital vernier, and analogue scales rather than digital to weigh the wire!

The wire feed and simple 'clutch' was rudimentary but effective, but the most intriguing part was the back and forth rack and pinnion motor set-up. Looked like something that had been re-cycled, and presumable the length of traverse could be adjusted to suit the width of travel. I think that nomally to get a smooth back and forth movement calls for a heart-shaped cam as used on sewing machine bobbin winder mechaisms. I have an article on making a coil winder using Lego and on heart shaped cams associated with that, which appeared in the UK Model Engineer Workshop mag and explains why the cam needs to be heart shaped to accomplish a smooth back and forth traverse.

Of course, as an antique radio sociey it worthwhile them construcing such a set-up, but perhaps a bit OTT for a one-off field coil.