RE: [TCML] Tuning idea

["Rich Schmuke" <rdj@xxxxxxxxxxxx>]

Gary
Opps , I did a quick check on the cap this AM to answer the question and
looked at the Fluke but for got to adjust for the 0's. You are correct pF ,
OK for a 21 MHz RF amp but not OK for a Tesla coil. I was just trying to
show you can build your own, but you need to use a little bigger scale.

Rich

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Lau, Gary
Sent: Thursday, January 10, 2008 2:07 PM
To: Tesla Coil Mailing List
Subject: RE: [TCML] Tuning idea

28 to 85 NF, or pF?  NF seems way, way too high, though that would certainly
be a dream come true for a primary tuning cap!  28-85 pF would be useless
for that application.

Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Rich Schmuke
> Sent: Thursday, January 10, 2008 2:58 PM
> To: 'Tesla Coil Mailing List'
> Subject: 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
> stuff.
>  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.
>
> Rich
>
> 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
> tubing?
> What is the total range of capacitance adjustment?
>
> Regards,
> 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

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