rotary electrodes (fwd)

To: "'Tesla List'" <tesla-at-pupman-dot-com>
Subject: rotary electrodes (fwd)
From: Tesla List <tesla-at-stic-dot-net>
Date: Sun, 9 Aug 1998 09:08:24 -0500
Approved: tesla-at-stic-dot-net

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From:  D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent:  Sunday, August 09, 1998 2:51 AM
To:  Tesla List
Subject:  Re: rotary electrodes (fwd)

to: Kevin

What cap size are you planning to run?  This will give me an idea of the
peak current involved.  Bare brass won't work -- it is a rather soft metal
and a cap discharge of .05 MFD or greater will melt it and also produce
very poor quenching.  I suggest our 1/2 inch dia. screw in style
tungsten/molydenium alloy which threads into a 3/8-16 NC x 1 1/4 inch long
piece of brass rod which is press fitted into the  rotor.  Don't use
aluminum as a conducting element -- poor Q factor and conductivity at RF
frequencies.  Run the brass thru the rotor (G-10) axially and screw the
tips in each side.  Run 4 gaps with approx 9-10 rotating electrodes at 1725
RPM.  

DR.RESONANCE-at-next-wave-dot-net

> Date: Sat, 8 Aug 1998 21:33:50 EDT
> From: Teslaman-at-aol-dot-com
> To: tesla-at-pupman-dot-com
> Subject: rotary electrodes
> 
> All...
> 
>   I need some opinions out there on what type of electrodes to use on an
> upcoming rotary.  It consists of a 3450 R.P.M. induction motor spinning a
12"
> aluminum disk with a phenolic center for electrical isolation.  The power
> handling will be in the 10+ kW range and the stationary electrodes will
be
> 3/8" tungsten tipped, but any ideas on what to use for the 10 spinning
> electrodes other than tungsten?   Thought about 3/8 to 1/2" dia. brass
rod,
> any suggestions?
> 
> Thanks
> 
> Kevin E.