Re: RSG electrode holders?

["sundog" <sundog-at-xxxxxxxxxxxx> (by way of Terry Fritz <twftesla-at-xxxxxxxxxx>)]

Hi all,

 A ceiling tile is *far* too weak to use in a rotary!!!  Unless
it's a fiberglass composite tile (which if kinda doubt if you used
a utility knife to cut it), it'll surely fail in duty.  I highly
discourage the use of that particular material as a rotary disc,
though I give you an A+ for thinking outside the box!

  I use 1/4" Palsun brand Polycarbonate sheet.  A good sized (12x18
I think it was) ran me ~$17 at home depot.  Use the 1/4" stuff.  It
machines really good, is tough as nails, and I've run a 4" diameter
disc up to 2kva for ~1-2 minutes at a time with very little heating
of the flying electrodes.  I use 10-32 threaded brass rod, with
washers and nuts for the electrodes.  For the stationary, I
recommend 1/4" or 3/8" brass rod.
  GPO3 or G-10 fiberglass-epoxy discs are the ultimate in rotaries,
but not necessary for low powered systems.  Even a small induction
motor can be modified for sync operation and still pull a
moderately sized disc.  Grab a sheet of the 1/4" polycarb, a
compass, scribe a circle, and have at it with the jigsaw.  You can
smooth it out on a sander or on the motor with a file.  I've had
great results with it, and others have had excellent results using
Lexan.  That, and I personally think the clear disc is just *much*
cooler lookin' ;)
                                        Caio!
                                                Sundog



-----Original Message-----
From: Tesla list <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Wednesday, November 15, 2000 9:10 PM
Subject: Re: RSG electrode holders?


>Original poster: "Jason Zuberer" <tesla-at-vortexia-dot-com>
>
>    I am no authority, but something as weak as a ceiling tile
would only be
>asking for trouble. If by some miracle the electrodes stayed in
place when
>it was spun up to 1200 or so RPM it would basically be a grenade
waiting to
>explode. All of the rotary gaps that I have seen are made with
G-10 or
>phenolic disks that can withstand the g-force and heat.
>
>    IMHO
>                Jason
>
>
>----- Original Message -----
>From: Tesla list <tesla-at-pupman-dot-com>
>To: <tesla-at-pupman-dot-com>
>Sent: Wednesday, November 15, 2000 3:33 PM
>Subject: RSG electrode holders?
>
>
>> Original poster: jduva-at-baytechnologies-dot-net
>>
>> Hey gang!
>>   I have some questions about the mounting of smooth tungsten
electrodes
>on
>> a rotary gap.  Namely...how do you do it?  Assuming the
electrode has no
>> threads cut into, you'd have to use some sort of holder, yes?
What is it?
>> :)  If anybody knows if this thing exists on McMaster-Carr, too,
that'd be
>> great!
>>
>> I'm currently experimenting with a ceiling tile that I have for
tacking
>> balsa plane part to while glue sets, by cutting a rotary disk
out of it.
>I
>> chopped a square out of a corner, superglued a little section of
.5" PVC
>> through the middle, stuck that on my .5" motor shaft, marked a
rough
>circle
>> on the spinning square section, took it off, and cut a rough
circle with a
>> utility knife.  With that done, I stuck it back on, spun it up,
and used a
>> fill to even up the outer edges and take off any bumps on the
top and
>> bottom.  I soaked it in some left-over polyurethane and am
waiting for it
>to
>> dry over the next year or so.
>>    Will this even work?  It only took me about 30 minutes to get
it all
>> shaped up, so it's no big loss if it turns out to be too weak
after the
>poly
>> dries completely.  I don't even know if it will withstand
moderate heating
>> around the electrodes.  I wanted to toss out the idea, though,
and get
>some
>> feedback.
>>
>> Thanks everybody for your help in the past and in the future.
>> Stay safe!
>>
>> -Joe Duva
>>
>> --Join the Active Coiler List!!--
>> --download it now at
http://hot-streamer-dot-com/jduva/download.html--
>>
>>
>>
>>
>
>
>
>