Re: Coil questions

["Tesla list" <tesla@pupman.com>]

Original poster: "Jim Lux by way of Terry Fritz <twftesla@uswest.net>" <jimlux@earthlink.net>



Tesla list wrote:
> 
> Original poster: "Gregory Hunter by way of Terry Fritz
<twftesla@uswest.net>" <ghunter31014@yahoo.com>
> 
> Corey,
> 
> Plexiglas is a pain in the neck to cut, sand, and
> shape.  It's too brittle--too prone to chipping and
> cracking.  Polyethylene cutting board material is
> fantastic from an electrical standpoint, and it's
> easier to work with.  However, it is impossible to
> glue as no known glue will stick to it. 

Actually.. there are two techniques that I am familiar with for gluing to
polyethylene (I note that you can get labels that stick to PE, so it's
clearly not impossible, although I admit the labels don't have much force
tending to peel them off...)

1) electrical spark preparation.. the surface is zapped by a brushy
discharge, which puts lots of little tiny holes in the surface, to which
the adhesive can "interlock"... surely, anyone who has a TC (or the parts
for one) has the means to create brushy discharges.  I haven't actually
seen this done, but a little research would probably find details.

2) Chemical preparation.  Using a variety of hideously corrosive and toxic
substances (i.e. chromic acid,TCE), one can epoxy bond polyethylene
(http://home.earthlink.net/~jimlux/hv/epoxprep.htm describes how.. )

For PE, though, thermal welding is the way to go.  get it hot (melting),
stick it together... 

 I like PVC
> pipe supports for my primary.  It's dirt cheap and
> works as easy as wood.
> 
> 22AWG is a good choice for medium-sized secondaries.
> I've wound a 4" x 24" and a 6" x 30" secondary with
> 22AWG magnet wire, and results were most satisfactory.
>  You can see them both on my web site.
> 
> Greg
> www.angelfire.com/ga3/tesla
>