RE: RSG electrode holders?

["Oxandale, Terry" <Toxandale-at-xxxxxxx> (by way of Terry Fritz <twftesla-at-xxxxxxxxxx>)]

I used 3/8" aluminum bolts (1" long) with a 1/8" hole drilled along the
centerline of the bolt. Then I drilled a small hole and tapped it to
8-32 threads for a set screw perpendicular to the centerline hole in the
meaty portion of the head of the bolt. The 1/8" tungsten electrodes then
slip into the long centerline hole and are secured in place with the
8-32 set screw. This entire assembly is then attached to the wheel by
drilling and tapping holes in the wheel so that this aluminum bolt (and
a good heat sink) screws into the wheel (no nut is used or needed to
hold this bolt in place). I run 4kva through this set-up and the moving
contacts don't even get warm at 2700 rpm on a 13" X 1/2" Lexan disc.

Un-Terry
> ----------
> From: 	Tesla list[SMTP:tesla-at-pupman-dot-com]
> Sent: 	Wednesday, November 15, 2000 5:33 PM
> To: 	tesla-at-pupman-dot-com
> 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
> 
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