[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: question for coin shrinkers



Moderated and approved by: "resonance" <resonance@xxxxxxxxxxxx>



The voltage isn't very high, so no use buying the expensive G-10. I've used PE and white acetyl rod (delrin) which can be easily machined to make excellent HV feedthrus. We usually put a small "shoulder" on the rod so it can be siliconed directly to the inside of your chamber. Use 2 inch dia and machine a 1/2 inch shoulder for approx 3/4 inch long. For the main wire you can use 4 AWG fine standed welding cable. Keep it in air over to the ignitron as the insulation is not designed for high voltages. Ignitron and trigger circuit set approx 12 inches outside the firing chamber.



xxxxxxxxxxxx
                  x  (shoulder area)
                  x
                  xxxxxxxxxxxxxxxxxx
                                                x
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - (wire goes thru center here)
                                                x
                   xxxxxxxxxxxxxxxxxx
                   x
                   x
xxxxxxxxxxxx


Dr. Resonance

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