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Registered Member #809
Joined: Wed May 30 2007, 08:59AM
Location: Melbourne, victoria
Posts: 114
well today i wound a secondary but i need help with the coating part. At the moment the secondary is covered in tape to stop the thing unwinding itself, but how do you coat the coil without tape so it doesn't unwind itself. i have the two pieces of wire for each side taped to the pvc it's wound on. also would resin be good for coating a coil? thanks
Registered Member #530
Joined: Sat Feb 17 2007, 07:56AM
Location: Victoria BC, Canada
Posts: 178
When I wind secondaries, I always make sure the first several turns are epoxied on tight. Then I continue winding.... the tension is usually great enough to prevent any loose turns from appearing. I use 24 hr cure - clear epoxy --- I buy this stuff in large containers - I premix and then use a cardboard roller and roll on the epoxy. Once cured I overcoat with Polyurethane 2 times.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
After I wound my coil I just applied two thick coats of semi-gloss polyurethane. Make sure you do it in a clean environments so you don't get bugs or dust sticking to it.
Registered Member #546
Joined: Fri Feb 23 2007, 11:43PM
Location: Albuquerque, NM
Posts: 239
I use a good gap filling CA glue (Scorpion 5) and heptane based activator as I wind coils. a little drop every few inches holds the coil together before I coat it with about 6-10 coats of shellac or spray on polyurethane. no tape needed.
Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
I coat the coil form with a clear varnis and let it get tacky before winding. If you wind fast enough the varnish holds the windings tight untill i coat them.
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
Purchase a can of spray-lacquer (polyurethane is especially good). You'll find spray application MUCH neater, easier, and more rewarding than any brushwork. You'll need many coats if you want it thick, but that should be no problem.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
If you made a device to turn the coil for winding, use the same device to apply much cheaper liquid polyurethane varnish (any non-water-based polyurethane varnish, matt-, gloss-, indoor-, outdoor-, yacht-, floor-varnish etc.) Keep rotating while the varnish dries, a very smooth thick coating is easy.
A thin coating is all that's needed, but a thick coating (a few layers) protects against knocks and bumps and scrapes. A thick coating looks really good too, but does somehow build up a static charge in TC service, so you may get a (very) small static shock from a completely disconnected coil.
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Coating?
