RSGs

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

Original poster: "Mr Gregory Peters by way of Terry Fritz <twftesla-at-qwest-dot-net>" <s371034-at-student.uq.edu.au>

First and foremost, I would like to thank you all for your advice 
lately. It has been most helpful. 

Today I bought a cheap and dirty 700W 11000 rpm angle grinder. I'm 
going to use only 4 electrodes for up to 733 BPS (even higher if I wind 
up the variac to 270v). The motor throttles quite smoothly with my 
small variac. I intend to use an 8" diameter disc, with the 1/4" 
electrodes at 7" diameter. The disc is 5 blank PCBs, glued together. 
I'm actually tempted to make a bigger disc to make the dwell time 
shorter. The rotary will be used in series with an air blast gap to 
allow better quenching, reduce flaming on the rotary and improve the 
lifespan of the electrodes. What do you think.


Cheers,

Greg Peters
Department of Earth Sciences,
University of Queensland, Australia
Phone: 0402 841 677
http://www.geocities-dot-com/gregjpeters