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Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Does most everyone here use a kind of homebrewed lathe to wind their secondaries, or is there other simpler ways, because I don't think I'll be able to wind this thing by hand.
Registered Member #477
Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
What are the dimensions? In the past, I've just put bolts through the PVC end caps on the ends of the secondary form and run these through pieces of wood that I C-clamped to my work bench. Then I just turned the coil by hand very slowly and kept things tight with my fingers. A very large coil probably requires different tactics.
Registered Member #514
Joined: Sun Feb 11 2007, 12:27AM
Location: Somewhere in Pirkanmaa, Finland
Posts: 295
I just wound a 30cm long secondary on a 110mm form with 0.25mm wire and it wasn't too bad. It took some 4-5 hours and I didn't use a jig. I was going to, but then I couldn't be bothered to build one.
But if you are going to be using any thinner wire (or a larger form), a jig will definately make your life easier.
Registered Member #580
Joined: Mon Mar 12 2007, 03:17PM
Location: Melbourne, Australia
Posts: 410
How about this: 2 blocks of anything, for stands a wodden stick, stick it across the stands with tape on each end use some cardboard tube on the inside of each end of your form and punch holes for the stick to go through add a rubber band for a belt around the tube and use a DC motor out of na old tape player or something that has a belt wheel. You can add a smaller version for the spool of wire, 2 stands with a stick through it. Worked for me.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
I threw together a coil winder in about an hour and had my secondary wound in about 2 hours.
4" coil form x 36" long PVC drain pipe coil form.
3/8 18 threaded rod, end caps, lots of nuts, two notched pieces of wood to straddle the rod, and something to keep the rod captive screwed down. All mounted on a scrap piece of pressboard. To power it, a cheapo electric drill from Harbor Freight, and a half wave SCR speed control I made for a friend. Tape the drill to the pressboard to immobilize it, tape a switch to a workbench, and now you have your hands free to spool and your foot turns it on or off.
I did this on a portable work bench, then had a rod in a vice holding my wire spool. It worked pretty well at probably 10 rpm. If you go too fast you start to get overlapping.
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Secondary Winding
