Is the critical part for such a machine the counting bobbin spinning part, or the automated guide that guides the wire onto the bobbin if that is needed at all for simple coils (like the one in Franks link)?
If it is just counting and turning the bobbin, I just had a thought about the motors that I used on my CNC machine. They do a smaller one (nema17), and they can be instructed to turn any number of steps and then decelerate to a stop.
I would love to have a go at winding some transformers, but from my little bit of looking around it will seem difficult to find a good supplier of the formers, and lamination's and then the mu metal can to put them in.
Cheers,
Tim