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Re: Secondary preparation and capping
Original poster: "Gregory Hunter by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ghunter31014-at-yahoo-dot-com>
No, you don't need to sand out every little defect.
I "prepare" PVC pipe forms by dunking them in a tub of
hot water with plenty of dish soap. I scrub off every
bit of dirt and print with an abrasive pad. I wash the
inside of the pipe too. After air drying over night, I
wind the wire on. I coat the finished winding with a
few coats of clear gloss polyurethane. I turn the pipe
on my winding jig as I coat it to achieve a glassy
Lowe's and Home Depot sell thin plastic knock out
plugs or "test plugs" for PVC pipe. They plug the ends
of standard PVC pipe perfectly and cost less than a
buck each. I usually glue them in place with clear
I've yet to have a secondary fail in service.
--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Patrick Bloofon by way of Terry
> Fritz <twftesla-at-qwest-dot-net>" <transactoid-at-home-dot-com>
> I am currently in the process of building my first
> coil. What I'm wonder is
> how necessary is it to sand down the secondary
> before winding it? My PVC has
> been sitting in my basement for a few years, so it's
> good and dry. If I
> just cover it in a layer of polyurathane, do I
> *really* need to sand out
> every little bump, and the letters (which are red,
> not black)? This just
> seems like a lot of extra work, and I don't see how
> it would make that much
> of a difference.
> Secondly, does it make any difference where the caps
> (as in the plugs) for
> the secondary are placed? I don't have access to the
> tools necessary to make
> nice round circles to plug the ends with, so would
> just sticking PVC endcaps
> on be acceptable?
> "Steadily getting more excited about completing his
> first coil"
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