Yes, you're I think right David. The 10 thou ablation measured was in fact
an error, as I now realise it was measured in situ after the run, so the
'mould' thickness was in fact not included.
The leading edge of the stationeries (those that face the rapidly advancing
rotary electrodes), had a definite slope to their end where material was
being dragged away.
(Solid Tungsten in 3/8 inch diameter always proves a challenge to source in
the UK)
As usual cursed by a low ceiling (protected by mesh)
https://www.youtube.com/watch?v=fR1MEOXsKgw
Phil
-----Original Message-----
From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of David Rieben
Sent: 13 March 2015 00:58
To: Tesla Coil Mailing List
Subject: Re: [TCML] Mouldy RSG electrodes?
Phil,
My only suggestion would be possible oxidation. I had noticed a white to
yellowish-brown powdery residue form on (and around) the RSG components
after so much run time. Back then, in my early days of big coiling, I was
running solid brass electrodes and of course, they were eroding at a fairly
good clip. My electrodes now are all pure tungsten, though, and this problem
seems to be considerably less prevalent since going to pure tungsten. Maybe
the copper tungsten alloy is eroding/burning more and causing more residue
than pure tungsten? Otherwise, I'm lost, too.
David
On Thursday, March 12, 2015 5:30 PM, Phil <pip@xxxxxxxxxxx> wrote:
Gents,
The electrodes of my RSG had quite an odd appearance when viewed up close,
after running at a recent teslathon, obviously not really mould, but I have
never seen this occur before:
https://www.flickr.com/photos/33962508@N03/16794887172/in/photostream/lightb
ox/
(click to enlarge)
Ablation was only around 10 thou or so, and the ridges that you see are
mainly formed by deposits. The outer two are the stationary pair (3/8 inch
Tungsten/copper alloy), while the centre one, is one of the four rotating
ones (0.25 inch thoriated tungsten).The other three looked the same. Power
was around 7.5 kw
Phil
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