Machining SRSG disk ?

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Original poster: "D.C. Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>" <DR.RESONANCE-at-next-wave-dot-net>



I use a 7 in. dia. disk with 4 electrodes.  Each electrode is a 1/8th in.
TIG welding rod cut 1.25 in. long and then pressed through an axial
precision reamed (not drilled) hole.  Disk material is 0.250 in. thick type
LE phenolic.  Electrodes are 1/2 in. inward from the disk edge.  Have a
machine shop do this work for you to insure .001 precision.  You really need
a mill with a turntable to do a good job.

Adding rings around the circumference and then soldering the tungsten to it
only creates problems.  For example, you solder has to be the same weight at
each joint or the rotor will be out of balance.  If a bolt if a different
weight, again, slightly out of balance.  Just press the TIG's through at 90
degrees (axial) to the rotor surface and you have a nice SRSG which will run
on a 1/20 to 1/25 HP (or larger) syncrho motor.  The conductive ring just
produces extra design problems and is not at all necessary.

Regards,

Dr. Resonance


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, July 23, 2002 7:27 PM
Subject: Machining SRSG disk ?


> Original poster: "Bryan Steinbach by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <hal-9000-at-telocity-dot-com>
>
> List,
> I'm interested in building a SRSG for a small 15/30 NST powered coil.
What
> level of precision is necessary for the disc?  My motor is 1800RPM and I'm
> considering 3" radius and 4 electrodes(120bps) on a 2.5" radius.  However,
> the motor is only 10W.  Will it be able to spin this up without needing a
> boost?
> Thanks,
> Bryan Steinbach
>
>
>
>