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

["Drake Schutt" <drake89@xxxxxxxxx>]

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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