Fw: Re:No 2cndary form

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Mark Presley by way of Terry Fritz <twftesla-at-uswest-dot-net>" <PresleyMark-at-msn-dot-com>


----- Original Message -----
From: Mark Presley <PresleyMark-at-msn-dot-com>
To: Tesla list <tesla-at-pupman-dot-com>
Sent: Friday, March 09, 2001 8:00 AM
Subject: Re: Re:No 2cndary form


> Hi all,
> I have recently completed a 8" X 36" secondary coil form as follows:
> Base for form is standard 8" Sonotube (Quickcrete) which is covered with
> waxed paper held down with a few strips of scotch tape. The form is then
> covered with 2 layers of BID (bi-directional ) fiberglass cloth, and
wetted
> out with standard glassing epoxy (about $20 worth), and then excess epoxy
> squegeed' out.The wet glassed surface is then covered with "peel-ply"
which
> is dacron cloth that. is peeled off the surface after curing, giving a
very
> smooth surface. This process will be familiar to anyone who has done
> fiberglass work. After curing, the coil wire was wound on the form  in
> traditional manner(close-spaced, but could easily be air-spaced) and then
> coated with a couple of cans of clear acrylic spray.At this point the
> spiral-wound cardboard is easily peeled out from the center taking the wax
> paper out with it. The finished form is only about 1/16" thick or so and
is
> quite rigid when the ends are plugged with your favorite material(I used
> vinyl-coated MDF 3/4" thick).
> Thin fiberglass has excellent dielectric properties and is quite low-loss
> (The popular G-10 material is basically pressure formed fiberglass). While
> not as physically as strong as pvc , the finished form is quite sturdy and
> will stand up to normal handling, although dedicated klutzes can always
> triumph over any finished piece!
> Regards,
> Mark P
> Lakewood, CO
> ----- Original Message -----
> From: Tesla list <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Thursday, March 08, 2001 12:13 PM
> Subject: Re: Re:No 2cndary form
>
>
> > Original poster: "Jason Johnson by way of Terry Fritz
> <twftesla-at-uswest-dot-net>" <hvjjohnson13-at-hotmail-dot-com>
> >
> > Or you could use a coat of pour-on epoxy the regular way, slide it off
> your
> > pvc (might need some wax paper or something in there to allow
seperation)
> > and then just put a coat on the inside. I believe that Greg Leyh (?)
used
> a
> > cardboard form wound and covered with epoxy and then blasted out the
> > cardboard former with high pressure water leaving the windings encased
in
> > epoxy. Also I don't think that having just the windings in poly or
> whatever
> > would do much for performance, it would probably just make a fragile
> > secondary. After all the losses from the pvc aren't all that big to make
> > much difference in coil performance (maybe 5% max) as compared to the
> spark
> > gap or other parts of the system
> >
> > Jason Johnson
> >
> > ----- Original Message -----
> > From: "Tesla list" <tesla-at-pupman-dot-com>
> > To: <tesla-at-pupman-dot-com>
> > Sent: Thursday, March 08, 2001 9:54 AM
> > Subject: Re:No 2cndary form
> >
> >
> > > Original poster: "ebyng by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> > <ebyng-at-netlimit-dot-com>
> > >
> > > As in just having a big coil of wire supported by poly coating?
> > > That would be different....
> > > I would think that the inside coating would take the place of the
> form...
> > > It would need some serious support, though, like thin strips of plexi
or
> > > something pressed into the coating every 1-2 inches, or a REALLY thick
> > coat
> > > on the inside/outside to hold it up......
> > > My $0.02
> > > S
> > > ----------------------------------------------
> > > Original Message
> > > From: "Tesla list"<tesla-at-pupman-dot-com>
> > > Subject: No 2cndary form
> > > Date: Wed, 07 Mar 2001 22:05:07 -0700
> > >
> > > >Original poster: "R Lunsford by way of Terry Fritz
> <twftesla-at-uswest-dot-net>"
> > > <Millipede-at-carolina.rr-dot-com>
> > > >
> > > >Hello All,
> > > > Just curious, how would removing the form after winding and coating
> the
> > > >secondary affect it's perfomance?
> > > >Thanks,
> > > >Robert Lunsford
> > > >
> > > >
> > > >
> > > >
> > >
> > > _____________________________________________
> > > Free email with personality! Over 200 domains!
> > > http://www.MyOwnEmail-dot-com
> > >
> > >
> > >
> > >
> >
> >
> >
>