Re: Foam-core Toroids

["brian foley" <ka1bbg1-at-mcttelecom-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

ah I wish he had foam....they used to make it in marlborough 10 years ago in
4x4x10 foot blocks. it was a process of fill it with beads of the stuff and
then steam heat and hydraulic cylinders moved the ends in for pressure. I
used to help them keep the hot wire saw going. If the wire isnt clean it
will not work right. I will be over to the gararge where they do a lot of
truck tires and see what i can find for tubes. Maybe we could just make a
strait-walled (like a hat box to fill) hold it till it cures. I got a couple
projects that must be done then I will be back to this project. I'm disabled
so time should be on my side but it isn't. cul...brian
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, September 14, 2000 1:46 PM
Subject: RE: Foam-core Toroids


> Original poster: "Lau, Gary" <Gary.Lau-at-compaq-dot-com>
>
> Hi Brian:
>
> If this guy is in the boat molding business and has access to the foam in
> bulk, perhaps he could just inject it into a truck tire inner tube.  While
> it clearly wouldn't have a rigid sidewall, so what if it expands while it
> cures?  As long as it expands uniformly, the inner tube would guarantee a
> perfect shape!
>
> Don't worry about the conductive coating.  Aluminum tape is cheap (at
least
> in the US), goes on easily, looks nice, and works well.
>
> Regards, Gary Lau
> Waltham, MA USA
>
> >Original poster: "brian foley" <ka1bbg1-at-mcttelecom-dot-com>
> >
> >Hi Gary, I'm just up the road and hour or so from you in nh. I had been
> >talking to a guy who ran a plastic molding shop(vacum formed) and tried
to
> >get an idea of how to mold foam as well. He says to get density control
you
> >must be able to cap off the container your filling and having just the
> right
> >amount of foam helps. As it needs to be capped off this means the mold
has
> >to have a lot of sidewall strength. I am still trying to come up with a
> way.
> >I wunder if there is a conductive coating that could be aplied inside the
> >mold first so the end result would be a smooth outer conductive
> shell(that's
> >how all these fancy bass boats are made.) gel first then decals then
color
> >then fibre layer. hmmm  cul brian
>
>
>
>