SRSG Electrode Excessive electrode wear ?

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

Original poster: "tesla by way of Terry Fritz <twftesla-at-uswest-dot-net>" <tesla-at-paradise-dot-net.nz>

Team
Fired up SRSG first time today, Went OK BUT rate of electrode wear is very
surprising, looking for confirmation its usual or is something a little
underated
SPEC
* Stationery 5mm Tungsten Rod, Clamped in Aluminium heatsink
* 3000rpm
* Rotating electrodes connected on disk with SS ring
* 200mm dia 6mm glass reinforeced fibreglass
* Rotating electrodes 6mm SS Dome nuts (two off)
* Power level was about 1.8kW (9kvc rms from 4 MOTS)
* MMC of 90nF

Ran for 2min total at medium power and Tesla ran fine BUT sparkes of hot
metal (like a grinder) fly off the rotary. (Is this normal ??)

SS Rotating electrodes very pitted and about 0.5mm of material removed.
And its a lot louder than the static gap ever was.

Phase of SRSG is tested by stroboscope to be correct (on bench check of
coincidence of mains peak and gap closure) also phase checked using magnetic
pick up throught full primary supply in operating configuration)

Tnx
Ted Linney in NZ