Re: question for coin shrinkers

["Tesla list" <tesla@xxxxxxxxxx>]

Moderated and approved by: "David Rieben" <drieben@xxxxxxxxxxxxxxx>

Hi Bill,

I have found 1/2" thick polycarbonate (Lexan) sheet
to be sufficient for this purpose firing up to 20 kJ. Po-
lycarb is used commercially in the construction of
"bullet-proof" windows, and I have found it almost
impossible to shatter a piece of this material by hitting
on it numerous times with all of my might with a blow
from a 2 lb. head shop hammer, backed against a steel
anvil!

David Rieben


----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, December 27, 2006 9:28 PM
Subject: Re: question for coin shrinkers


> Moderated and approved by: Gomez Addams <gomezaddams@xxxxxxxxx>
>
> This is high voltage, but technically off-topic.
> Feel free to reply to me off-list.
>
> I will eventually be building a containment vessel (possibly even
> with some sound insulation) for coin shrinking work coils, after I
> get my main pulser rebuilt.  The chamber walls will probably be made
> from 1/2" steel plate with 1x1" angle iron ribs/stiffeners.  The
> pulser stores a maximum of 18kJ @ 10kV (wish the voltage was higher).
>
> As for insulating materials for the HV feed-through area, what
> materials have you used?  I was thinking of using two layers with an
> air gap, possibly with 1/2" silicone resin based G-11 on the inside.
> I gather the larger the chamber, and more distant the walls from the
> work coil, the better the survivability.  I also assume that high
> modulus, high hardness materials like phenolic laminates will tend to
> shatter, even the linen based ones.
>
> What have your experiences been and what materials have you used?
> G-10?  G-11?  Polycarbonate?  Phenolic?
> Filled polycarbonates?  Delrin?
>
>   - Bill "Gomez" Lemieux
>
>
>