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RE: [TCML] Tuning idea

Thanks Scott.
 The cap in the picture is 28 to 85 NF, it has a wide spacing, approx .405
spacing. (7/16 spacer with .032 rotor stock). You can get a better range
with a closer spacing but then loose on voltage rating. The spacers are
premade for #10 machine screws, you can buy them by a sack of 100pc, or one
at a time, any length and I have got them at flea markets also. Several
small parts places on the internet carry them, threaded rod is standard
 Don't know on fab time as made a little here and a little there.  I had the
roughed out rotor and stator plates for a few years until I retired and had
some time. The first try was with alum end plates but the min capacitance
was too high so now Lexan end. The only odd ball part is the wiper on the
rotor end. It is formed from BeCu sheet them heat treated at 600 degree. I
like to make things by hand. If I could stand at my drill press and saw and
things for a long period of time my wife would never see me.


To: Tesla Coil Mailing List
Subject: Re: [TCML] Tuning idea

Rich -

That home-brew air-variable cap is an absolute work of art. Any estimate of 
the total fabrication time? Were the spacers for the fixed plates made from 
commercial sleeves or spacers of some sort, or did you cut each one from 
What is the total range of capacitance adjustment?

Scott Hanson
----- Original Message ----- 
From: "Rich Schmuke" <rdj@xxxxxxxxxxxx>
To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
Sent: Wednesday, January 09, 2008 3:42 PM
Subject: RE: [TCML] Tuning idea

> Ben
> If you look at the picture of the v-cap I made you will see extra holes in
> the plates. The holes allowed me to bolt them together and clean the all 
> up
> the same time with a die grinder and a rotary. file. So yes they could be
> made that way. I made mine from 6061T6.
> I used "T" material because it does not deform as easy.
> http://www.flickr.com/photos/kd0zz/
> Rich
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> Of Ben Sneath
> Sent: Wednesday, January 09, 2008 4:52 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Tuning idea
> hello all,
> would it not be possable to make a jig to cut out 50 1'
> diameter semicurcular plates then assemble half onto an
> alumimiun shaft spaced with washers, and fix the other half
> to a sheet of al, then put every thing into oil on an
> acrylic frame...
> ben

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