G0RNN's toroidal coil winding helper
Original Date : 28 January 2015
This is a fantastically simple and useful tool designed and built by Chick G0RNN (SK) and described to me by Ray G1OJP (SK). Constructed entirely from tinplate from a large tin of baked beans or similar, the tool provides a third-hand making toroid coils easy to wind.
There isn’t a lot more to say, the design is pretty self-explanatory from the photographs. The only thing to consider during construction of the tool, is that cut tin-plate will have sharp edges, so should be smoothed with emery paper or similar before soldering.
The spike holds the toroid well and lets you easily pass the wire though. I’ve wound down to 5mm inner diameter coils with my version of this device. Another useful tip I found was to solder one end of the wire to the tinplate (just a tack joint), this helps get the first few turns though the toroid in place if the wire is very springy.