Good explanation tribbles. Of course acceleration will stil apply to Hank's rotational requirement. I am not sure if he has a linear arrangement controlling the wire position on the bobbin, so probably he has 2 degrees of motion whch have to be sync'd. But again that is easy to do - for each rotation of the bobbin, move the wire along 1 wire width. Winding 50swg wire (0.1mm dia I think) would ideally need about 10 steps per rev to get it neat...so a resolution of .01mm, so 2mm pitch screw on full step would be fine. The rest is simple math to work out the step rates needed per second, including acceleration and the maintenance of simple counters to know where we've got to...

In fact this would be a great candidate for a PIC based standalone controller, no PC needed, just a PIC, keypad and display, along the same lines as kwackers rotary table controller...