Indeed I am -- sorry about the unclear title. I only posted about the part that mattered to me, not the part I threw away :).
a shorted turn will slow its response down making it easier to control. I've not seen that in and disk drives.
110 feet of #40 wire gives me about 200mV p-p on a 1Hz pendulum, and "lots" of force when I put five volts on it (I couldn't measure -- it's "lots"). Total resistance is about 120 ohms, and it's big enough to dissipate 1/4 watt easily.
This is becoming an obsession -- have you ever wound 100 feet of hair- fine wire onto a form?
Much reduced L/R time constant, at the price of needing a higher drive voltage. Is it possible that the disk drive generates, say
80V internally? A lot of the "pinwriter" style dot matrix printers use high drive voltages (up to 90V); and even 30-40V for low-ohm steppers. 3300 feet (1km) #43 wire. Multiple times, but not manually. I started by building a winding machine...for guitar pickups.Clifford Heath
It's bedded in epoxy, and since it's 30-minute epoxy I was starting to worry toward the end. Fortunately, while it was starting to get sticky toward the end, I still managed to finish.
I have a lathe I could have wound it on, but I was afraid of overshooting and breaking that fine wire.
I re-wound the 240V primaries in a few ~10VA transformers when I was in high school... there's a lot of wire in them.
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