Re: DC rotary gap?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "bob golding by way of Terry Fritz <twftesla-at-uswest-dot-net>" <yubba-at-clara-dot-net>

Hi Greg,
    What I am using on my rotary is a universal brush motor. It came out of
a centrifuge so has a really god solid bearing. I use it vertically. There
is a pic at hot streamer under "bob g's gap" it runs from zero to 5500 rpm
and is rated at 300 watts. I am using a 12" rotor with 8 fixed electrodes
and 4 static electrodes spaced at 67.5 degrees in two pairs. This gives a
break rate of 733 BPS at 5500 rpm. Running it on ac the best spark length is
at 1500 rpm which is 400 BPS _I THINK_ someone please shout if this is
200bps. I am not too sure if I have the formula right 8/60*1500*2? I intend
to go to a dc supply as soon as I have all the bits. so far I have the
diodes the wire for the resistor, the choke and filter caps are coming soon.
Then I can run from 1 bps to 700bps without worrying about beating with the
mains which as I discovered kills your caps dead quick. Sorry I let the
smoke out  nick
( 

cheers
bob golding


----- Original Message ----- 
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, April 26, 2001 12:14 AM
Subject: DC rotary gap?


> Original poster: "G by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<nieporgo-at-email.uc.edu>
> 
> >The best use of async rotaries IMHO is on DC coils. On a DC coil you can get
> >really neat effects by varying the break rate from less than 100 to as high
> >as your little motor will spin the electrodes, and the sparks changing
> >appearance all the while. On AC coils, such as NST powered coils they do not
> >have much advantage, especially when you try to run a low break rate and the
> >electrodes are not in the right place at the right time (especially with a
> >close to resonant cap value), and your transformer and/or cap goes poof and
> >lets the smoke out (all electronic equipment runs on smoke, let the smoke
> >out and it stops working ;-).
> 
> Hi, I am going to be working on a DC mot-powered coil soon, what 
> motor specs should i look for to power my rotary gap? I will be 
> looking through a surp
lus shop for my motor. Do i just throttle the
> motor with a variac or dimmer, or is some electronic controller
> required? I am assuming many electrodes are also used on the disk to
> enable several thousands of bps. I seem to remember Kevin O. saying
> his rotary gap did a few bps to thousands of bps.
> Here's to keeping the smoke in,
> Greg
> --
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