RE: [TCML] DIY dent-proof Toroids

["Phil Tuck" <phil@xxxxxxxxxxx>]

Clive,
I blew one up once with air with an idea to using it covered with Alu foil, but it wasn't particularly uniform in shape. So I presume you would get the same misshapen result if using it as a mould. Also the pressure to get it inflated may be too much for foam?
Someone on the web has used them though, I'm sure I've seen them. Dr Peter T in Australia comes to mind for some reason.

Phil


-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Clive Penfold
Sent: 27 May 2013 18:04
To: Tesla Coil Mailing List
Subject: Re: [TCML] DIY dent-proof Toroids

I'm sure it has been mentioned before, but why not use a vehicle inner tube as a mould. The only disadvantage that I can see is after you have cut off the tube, you would need to glue in a centre disc which wouldn't be as strong as in Phil's design
.
In the UK, the cheapest source of aerosol expanding foam that I have found is Toolstation


http://www.toolstation.com/shop/Adhesives%20&%20Sealants/Expanding%20Foam/Expanding%20Foam/d180/sd2857/p27912

Clive




>________________________________
> From: "mddeming@xxxxxxx" <mddeming@xxxxxxx>
>To: tesla@xxxxxxxxxx 
>Sent: Monday, 27 May 2013, 17:34
>Subject: Re: [TCML] DIY dent-proof Toroids
> 
>
>Perhaps "spin-balancing" while it cured would solve some of the distribution problem, especially if done in several steps, building towards the inside to allow proper out-gassing. When in a confined space with some air, the out-gassed fumes from "Great-Stuff" foam are nicely explosive!
>
>
>Matt D.
>
>
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