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Re: [TCML] Poly thickness
jhowson4@xxxxxxxxxxx wrote:
All this talk of putting poly on coils has got me wondering (how many
coats of poly is enough) i recently wound a 3" by 24" secondary with
some #28. first i coated the form with 1 coat of poly. then i
wound the coil. Then I put on 4 more coats of poly. is that enough?
I ha\ve not had any problems with it yet.
jay howson _______________________________________________ Tesla
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Hi Jay,
There are many folks who successfully run their coils without using ANY
polyurethane or epoxy coatings over their magnet wire. Others have used
10's of coatings. The coating helps to hold the wires in place
(important if your secondary is subjected to wide temperature
variations). Otherwise, it's more of an aesthetic thing: how pretty do
you want it to look, and how patient are you...
If you do decide to coat your coil and want it to look really great, I'd
recommend coating it with a two-part polyester (good) or epoxy (best)
resin instead of applying lots of individual coatings of polyurethane
varnish. It's much less work and provides you with a superior
appearance. You'll need to continuously rotate your coil form while
applying the coating, and you must continue rotating until the coating
cures to avoid getting sags.
Apply the coating in a dust and bug free area - and don't apply at night
in the summer under bright lights (don't ask me how I know). A beautiful
water clear epoxy or polyester coating will enhance the appearance of
your coil, will help smooth out the E-field near the wire surface, and
may even provide some protection against wire damage for
primary-secondary flashovers or racing sparks. The downside is that the
polymer surface tends to develop a persistent surface charge that can
"zap" you long after the coil has been powered down.
Bert
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