Re: Construction of an SRSG disc

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Original poster: "Christoph Bohr" <cb@xxxxxxxxxxxxxxx>

Hallo Shad.


Nice work with your RSG.
I made a very similar approach a year ago,
but a lot less tidy and with some very crude tools.
I used a length of wood with two nails and pushed one
nail into the center hole, then turning and scratching  into
the pcb board until I was almost through, then snapped
of the remaining parts and sanded it smooth.
My versioin was a lot smaller, ca 4" dia rotor with the same
type of oriantal motor known from the propeller gap.
I only had several minutes of runtime on it, but it worked fine.
However, I made 2 of those disks and glued them together for
more strength and double copper thickness, not sure how
neccessary this is...
Good way of making the disk wiht simply tools.
Keep up the good work

best regards

Christoph






Gruss

Christoph Bohr

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----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, November 11, 2005 2:38 PM
Subject: Fwd: Construction of an SRSG disc


> Original poster: Terry fritz <tfritz@xxxxxxxxxxxxxxxxxxxxxxx>
>
>
>
> Subject: Construction of an SRSG disc
> From: Shad <shenderson@xxxxxxxxxxxxxxxx>
> To: tfritz@xxxxxxxxxxxxxxxxxxxxxxx
> Date: Tue, 08 Nov 2005 09:23:51 -0500
>
>
> Hi Terry, please forward this to the List and post links to the
> pictures.    Thanks!  SH
>
>
> Hi All,
>
> Here's some pictures and instructions on how to make a small SRSG disc
> for a *low powered* coil.  This is ideal for tabletop coils where you
> want a lot of performance in a smallish package.  I've used this SRSG on
> an OBIT, a 9/30, a 12/30, and a 9/60 NST without fail.  The electrodes
> will wear out faster at higher power levels, but they're cheap and
> easily replaced.
>
> http://hot-streamer.com/temp/ShadH/
>
> I came across 3 small 1750 RPM motors in a box at the flea market.  Each
> was around 2.5-3" in diameter, and pretty much as long as they were
> wide.  Each had an armature of ~1.2" or so.  1 was a dud, the other two
> worked and were modified with 4 flats for salient pole sync operation.
>
> For a disc, I used double sided 4x6" PC board from Radio Shack.  That
> gives me a disc just under 4" in diameter.  The flying electrodes are
> 8x32 brass machine screws, and the stationary electrodes are 1/4"
> threaded brass rod fixed in aluminum heatsinks.  The arbor is from
> McMaster Carr, and was pretty cheap.  A block of lexan spaces the disc
> out away from the motor some.   I etched 2 rings on the disk (front and
> back) for conductivity, so that I can use only 2 stationary electrodes
> on the front of the disc.
>
> I fabricated the disc with no more tools than a drillpress, a few drill
> bits, a Rotozip tile cutting bit (though I'm sure the spiral saw bit
> would work just fine on PCB material), a Sharpie permanent marker to
> mask the disc, and a bath of ferric chloride to etch the disc.
>
> I used a finishing nail to mark a center, then used a protractor to lay
> out the spacing for the 4 electrodes.  A small drill bit served as an
> axle, and a scrap of MDF held everything secure.  The attached pictures
> are pretty self explanatory, though I'll be happy to help anybody who
> asks.
>
> Shad H.
>
>
>