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Re: Toroid Design Features


From: 	Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: 	Sunday, November 09, 1997 3:52 PM
To: 	Tesla List
Subject: 	Re: Toroid Design Features

Hi Chuck,
             A year or two back I talked with a couple of local 
spinners about making toroids. t seems the big cost is in making up 
the formers around which the metal is spun. They shape them out of 
wood before doing the actual spinning. The prices convinced me that 
there had to be a better way. I now just glue foam blocks together, 
shape them with a serated knife, smooth them with sandpaper, then 
apply Al foil with contact adhesive finally smoothing the crinkles
down by rolling the article around on a hard surface. I don't bother 
about cutting out the inside which also helps with mounting them.

Malcolm

> From:   Chuck Curran[SMTP:ccurran-at-execpc-dot-com]
> Sent:   Saturday, November 08, 1997 12:09 PM
> To:     tesla-at-pupman-dot-com
> Subject:    Toroid Design Features
> 
> Hello All:
> 
> I'm in the process of deciding on how to prioritize coil improvements for
> the next few winter months.  Near the top of the list is the toroid.  I am
> going to get pricing for a spun aluminum toroid and that is where a question
> pop's up right away.
> 
> Many of us have made a toroid using a similar set of design features.
> Specifically, a flat center disk surrounded by the "Donut".  The large
> radius Donut clearly prevents the premature spark breakout, but results in a
> shape that may increase the cost of a spun aluminum item.  Here's the real
> question.  When I draw up a design to take to a local spinning supplier, I
> would like to have as much flexibility as possible to control the cost.  I
> see a toroid that would be, let's say 10" thick with a 5" edge radius as
> being just as effective as one with the 10" diameter outer donut coupled to
> a thin center disk.  I hope the cost would also be lower.  The capacitance
> should be almost identical too.  Have I missed something here, or would the
> thick top hat be just as effective?  We have many local metal spinning job
> shops and any flexibility in the design would sure be a benefit.  Thanks in
> advance for any comments.
> 
> Chuck Curran
> 
> 
> 
>