Cute little coil winder. I have a version of that with a motor and a footpedal I sometimes use, but I also built a jig for my lathe I use a lot more (running slow, of course).
Someday I plan to make the cam jig for the lathe so I can do that "universal" winding thing for lower stray capacity. I use the lathe all the way down to #40 wire, with my hand on the
wire feed to avoid sudden tugs on the wire that would break it --kind of like the arm on an old RR tape deck to help with constant tension, same idea. In low gear, the lathe starts and stops slowly, making it easy, and when I goof, I can make it go backwards to unwind the goof part and do over. Of course, for single layers, it's nice to use the lathe threading settings to get "just so" wire spacing -- pretty much whatever you want there. As long as you keep a little tension on the wire, it will hold till whatever glue/wax/shellac/glyptal you use to keep it right gets hard.
Very nice for RF kinds of things.
Question -- how does that system handle getting from one "pie" to the next without having an insulation problem like you have if you just come off the top of the first one to the bottom of the second (which means a wire alongside the whole second pi to be arced to from the top of the second pie). That one has been an issue here...with the HF stuff having so many volts/turn.
Nice to know there's someone else here who winds their own coils...not common, but a very useful skill
I've been lucky to collect a large amount of magnet wire in nearly all sizes there are, so I go for it. With the price of copper these days -- it's an investment!
Posting as just me, not as the forum owner. Everything I say is "in my opinion" and YMMV -- which should go for everyone without saying.