Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx>
A manhole ring, such as this one I Googled, won't have
the shape you need:
http://www.wsdot.wa.gov/eesc/design/designstandards/english/pdf/b25_eng.pdf
You need a true toroidal shaped topload. If you want
to use municipal products, try welded steel pipe.
Adam
--- Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: "Binny" <binny@xxxxxxxxxxxx>
>
> Hello list, and thanks once again for all the
> information you have
> shared so generiosly.,
> On the subject of torriod
> construction I would like
> to suggest using a balsa filler like I used when I
> was into R/C
> modeling,also known as spakle or sanding compound.It
> is lightweight
> somewhat flexible and sands very easily.Looks like
> marshmellow fluff
> and is sold in tubs. Also I would like to have the
> list members
> thoughts on a torriod that I would like to try on my
> 6" coil project.
> I have a manhole ring of the kind that is usually
> found in municipial
> wast water drainage systems.It weighs around 300 lbs
> and I am not
> shure how I will go about supporting it but I think
> it would make an
> indestructible torriod. So to the chase I present my
> querry. Does the
> torriod's mass affect it's capaicatince? How does a
> really massive
> pice of iron affect the peformance of a coil?
> ----- Original Message ----- From: "Tesla list"
> <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Friday, August 19, 2005 7:00 PM
> Subject: Re: Toroid Building
>
>
> >Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx>
> >
> >Sounds kinda brittle (and heavy). I used drywall
> >compound for a smaller one and it worked out fine,
> but
> >I'm not so sure how it will work on a large scale.
> Why
> >not just try it with the corregations first? How
> about
> >Bondo? Works well, sands smooth, and is very
> durable.
> >
> >Adam
> >
> >--- Tesla list <tesla@xxxxxxxxxx> wrote:
> >
> > > Original poster: "Gerry Reynolds"
> > > <gerryreynolds@xxxxxxxxxxxxx>
> > >
> > > Hi All,
> > >
> > > I'm in the process of making a 8x32 inch toroid
> > > using the heavy
> > > ducting from McMaster-Carr
> > >
> > > I have the toroid formed (ends attached) and I
> plan
> > > to mount an AL
> > > disc in the center with a little RTV. I want to
> > > fill the
> > > corrigations with something that can be easily
> > > sanded to make
> > > smooth. I am planning on using PLASTER_of_PARIS
> for
> > > this purpose
> > > (done after the center disc is mounted for
> > > rigidity). After sanding
> > > smooth, I plan on sealing the plaster with a
> varnish
> > > and then adding
> > > AL tape starting and terminating on the AL disc.
> > >
> > > Does anyone see a problem with using the
> plaster??
> > > Grout is maybe
> > > another choice for a filler. Ideas welcomed.
> > >
> > > Gerry R.
> > >
> > >
> > >
> >