Re: question for coin shrinkers

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx>

I have a 10kJ shrinker using two 10 kV 100 mF
Maxwells. I have 3" x 1/4" silverplated copper bus
bars from the caps up to the switch. I have a switch
to remove the PSU from the charging circuit before
closing the big switch. To enter the containment box,
I cut the bus bar in half for 1-1/2" x 1/4", then used
grey pvc pipe, which I softened with a heat gun, and
slid over the bus. I don't recall the size, but it was
probably 1". If I recall, I have 4" of pvc; two inches
either side of the box wall. I cut the hole in my box
very tightly around the pvc, but have seen no evidence
of tracking or flashover. It's cheap, easily
rapairable and works well. My containment box is
floating, (not grounded) so it doesn't really have to
stand off the 10 or 20 kV for each bus; only half
that. I charge through my work coil, so there's no
real voltage differential until i discharge my caps.

Adam

--- Tesla list <tesla@xxxxxxxxxx> wrote:

> 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
>
>
>
>
>


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