And woe unto anyone who guesses wrong on how much wire the job will take. To solve those problems, [Sandeep] came up with this clever and effective toroid winder. The idea is to pass a small spool ...

and the diameters of the wire. The video below shows the machine going through its paces, with pretty neat and tidy results. Being such a tedious task, this is far from the first coil winder we ...