RE: RSG Disk Material

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

Original poster: "sundog by way of Terry Fritz <twftesla-at-uswest-dot-net>" <sundog-at-timeship-dot-net>

Hi Steve, All,

  Nothing wrong at all with GP03.  I bought 2 12x12x1/2 pieces of it for I
believe $12-15$ a sheet.  Great price on some hefty material.  My thoughts
were,

  "If the flying electrodes get to that temperature, it's too much power,
too slow a disc, or too long a run.  I can at least cut this stuff with a
handfull of those new cheap jigsaw blades.  It's a *lot* cheaper than G-10.
It's only $12-15 a sheet, so I won't be out but about $30 (GP03, cheapie
jigsaw blades, arbor, etc) if it doesn't work. "

  Grab some (maybe 3/8 or 1/4, the 1/2 shtuff is murdrously heavy!), get a
half dozen cheapie jigsaw blades (you'll tear the teeth of almost any blade,
no no use wasting monef on a $12 blade that'll last maybe 3 min longer than
a $1 blade).  Use a compass to mark your disc, then have at it with the
jigsaw.  but above all *USE A RESPIRATOR!*  This *is* still fiberglass, and
nasty nasty nasty stuff happens to your lungs when you breathe the dust.
Also, gloves are a good idea, as those little fiberglass splinters drove me
insane for a day or so. Can feel 'em but can't find 'em.

  My pig-capable SRSG is coming along, and I'm using a 11.5" disc on a 1/3hp
motor ground for sync operation.  I'll couple that with John Freau's phase
adjuster (JF adjuster?).  Pics are forthcoming, and the holidays limit my
"work on the coil time".  GPO3 is creat stuff!
													Shad

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Tuesday, December 19, 2000 11:30 PM
To: tesla-at-pupman-dot-com
Subject: RSG Disk Material


Original poster: "Steve & Jackie Young by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <youngs-at-konnections-dot-com>

Dear RSG builders,

I want to know why I shouldn't use GP03 (electrical grade figerglass)
instead
of the more expensive G-10 (Garolite)?  As Dan points out below, the G-10
has 4
times the tensile strength, but about 4 times the cost and about two-thirds
the
high temp rating.  At what rotor electrode velocity will 10,000 PSI tensile
strength not be adequate to keep the electrodes from becoming projectiles as
the RSG flies apart?  I like the cheaper price of GP03, and being able to
cut
it with non-carbide tools.

Your thoughts on GP03 vs G-10 will be appreciated.
--Steve

[Snippers!]