Re: [TCML] Form materials, losses, carbon tracking, sealing

["Brian Foley" <ka1bbg@xxxxxxxxxxx>]

Hi, i attempted to do this with a coil wound on a candle, epoxied on the
outside, melted the candle away, it worked but had a tendancy to arc across
from turn to turn, it was fragile and broken after only a couple plays. not
very scientific but just didnt do anything special that i could see. cul
brian f.


      www.genapro.com
----- Original Message -----
From: "Drake Schutt" <drake89@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Monday, December 17, 2007 10:19 PM
Subject: Re: [TCML] Form materials, losses, carbon tracking, sealing


> Hi Scott,
>
> I mentioned the idea a while back and the consensus seemed to be that you
> would have a *very *fragile secondary and it would be very impractical
once
> you try to put a top load on it.  I think it sounds like a neat idea, but
I
> haven't tried it yet.  Maybe on my next coil?
>
> good luck,
> Drake Schutt
>
> On Dec 17, 2007 9:07 PM, Scott Bogard <teslas-intern@xxxxxxxxxxx> wrote:
>
> >
> > Has anybody ever tried building a coil on a cardboard form, applying
> > many, many coats of thick urethane or epoxy or whatever, and then
> > removing the cardboard form alltogether?  From what I understand of the
> > sonotube cardboard forms, they are meant to peel off once the concrete
> > is dry, so would it be possible to have a very delicate formless coil if
> > great care was exercised during it's construction.  Please note, I do
> > not consider myself careful enough to try this, I am simply curious to
> > see if anybody else did.
> >
> > Scott Bogard.
> >
> > Lau, Gary wrote:
> > > I think it was someone else who noted a failure on a new PVC
secondary,
> > and failure analysis showed that there was something embedded within the
> > plastic. I think it may have been Terry that investigated the contents
of
> > PVC forms, but not certain.  If one takes a piece of relatively thin
wall
> > PVC pipe (4" SDR) and you put a light bulb inside, it's easy to see bits
of
> > flotsam and jetsam.
> > >
> > > As a separate issue, Terry performed a "ping" test to investigate
> > secondary properties, and found that secondary coils wound on paper
concrete
> > forms were significantly lossier than PVC forms.  But the experience of
many
> > suggests that at least for spark-gap coils, concrete forms do work,
perhaps
> > because when using a pole pig for power, the losses in the form are
small by
> > comparison.  I think I recall some say that when used for CW coils, tube
or
> > solid state, that the losses in concrete forms do become a problem.  Not
> > sure about disruptive DRSSTC's, but probably best to stick to PVC there.
> > >
> > > Regards, Gary Lau
> > > MA, USA
> > >
> > >
> > >> -----Original Message-----
> > >> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> > >> Behalf Of Barton B. Anderson
> > >> Sent: Friday, December 14, 2007 8:51 PM
> > >> To: Tesla Coil Mailing List
> > >> Subject: Re: [TCML] Form materials, losses, carbon tracking, sealing
> > >>
> > >> It's not the ink but the particles that become embedded within the
> > paper
> > >> (metallic particles) when it's made. I think Terry Fritz did a study
on
> > >> this to find areas of metal clumps within the cardboard. Obviously,
> > >> moisture absorption is high so sealing is certainly recommended.
> > >>
> > >> I personally haven't had any noticeable problem with paper concrete
> > >> forms, but I can understand the apprehension. What I don't like about
> > >> the forms is end cap mounting. Also, if it falls it's easily damaged
> > >> (like when your wife opens the garage door and the back of the door
> > hits
> > >> the top of the coil! Yes, I know, my fault).
> > >>
> > >> Take care,
> > >> Bart
> > >>
> > >>
> > >>
> > >> Dr.Hankenstein wrote:
> > >>
> > >>> I'm not so sure if using paper concrete forms is such a bad idea if
> > you take care
> > >>>
> > >> to make a careful selection and remove the "inked" layer, properly
dry
> > and varnish
> > >> the form. For example, here is a picture of a 12" by 48" coil built
by
> > Dr. Spark
> > >> producing about a 8 foot spark. This coil uses a cement form and has
> > produced
> > >> arcs in excess or 14 feet with no problem!
> > >>
> > >>> http://www.drspark.org/images/wwt2007/1281.JPG
> > >>>
> > >>> Spark on!
> > >>>
> > >>> Woo
> > >>>
> > >>>
> > >> _______________________________________________
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> > >>
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> > >
> > >
> >
> >
> > _________________________________________________________________
> > i'm is proud to present Cause Effect, a series about real people making
a
> > difference.
> >
> >
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