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Re: Rotary spark gaps



Original poster: "rheidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>

Just a thought. At 6ooo rpm an electrode will fly off the rotor like a
bullet if it gets loose. I wouldnt touch that one...Safety first
   Robert  H

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Sun, 24 Mar 2002 22:11:02 -0700
> To: tesla-at-pupman-dot-com
> Subject: Rotary spark gaps
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Sun, 24 Mar 2002 22:17:47 -0700
> 
> Original poster: "makinglightning comcast by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <makinglightning-at-comcast-dot-net>
> 
> I am building a rotary spark gap and was wondering which of 2 directions
> that I should go.
> 
> I have a 1hp 24vdc permanent magnet motor with a 1/2" x 11" wheel with 14
> electrodes that I have not mounted yet, which spins up to 2000 rpm (rated).
> That would give me 460 bps.
> 
> I also have a 1.5 hp 90vdc pm motor that spins up to 6700 rpm (rated). I was
> thinking of a .187" x 7" that I am about to route, with 6 electrodes. That
> would give me up to 600 bps.
> 
> I will vary both of these with a variac.
> 
> I am not sure which way I should head in. I know that maybe I might have
> balancing problems with the faster one? It would be a smaller package though
> and would not require a transformer. But maybe 460bps might be just fine
> with the slower motor? Would the faster one run cooler maybe? What power
> levels could I go up to with brass bolts? I have heard that they would be
> less likely to melt down than other types of bolts. Maybe I won't need
> tungsten carbide in the wheel, less work, easier to balance. Should my
> stationary electrodes be very big brass bolts or 3/8" carbide bits? Are
> there any plusses and minuses to these two motor approaches that I am not
> thinking of?
> 
> If anyone wants to give me their 2 cents on any of this, I would greatly
> appreciate it.
> 
> Kevin
> 
> 
>