Hi Dalibor,
it is a Pirani gauge. A friend of mine gave me a two-stage rotary vane
pump with flange terminal and a Pirani gauge that works fine down to
10E-4 mbar. Will take a picture later. I will mount my flange needle
valve when it gets here (a couple of days) and then I will take a lot of
pictures for documentation anyway.
The capacitor welder You have will work well, it is not suitable for
welding materials with high melting temperature like tungsten and
molybdenum, but for steel, nickel and so it is very good!
The plier, however, is horrible. I will have to built one by myself; all
I need for that is just some pieces of copper.
> The problem with stainless steel wire is that it outgasses; I have a
glow lamp with two stainless steel electrodes and it glows in a
white-ish blue color, very strange. Will post a picture later this
weekend if I don't forget.
the bluish color is not outgassing, outgassing is when the metal
releives trapped air, oxygen, CO2, moisture and so into vacuum, You
can avoid that by heating the wire into red for a minute or so just
before sealing and pumping.. Each metal behaves differently in
discharge - different voltages and so, so it could be because of that..
I should have been more precise: The glow lamp in question heated up
during my first test to about 100°C. At that temperature, the stainless
steel electrodes were rather hot, too. I just thought that at this point
the outgassing began because afterwards the color had shifted from
violet (air) to some white-ish blue (air + outgassing). So the
outgassing has changed the atmosphere inside my tube.
I don't think that different electrode materials produce different
colors, the physics are the same, the color only depends on the gas you
use. The ignition voltage was the same (550V DC).
But maybe it is also an optical illusion because the stainless steel
electrodes are much more reflective than Dumet wire and so a lot of
ambient light gets reflected off of them creating the illusion of a
white color component.
Jens
Dalibor
Dne 19.10.2012 7:29, jb-electronics napsal(a):
Hi guys,
thanks for your advice. I think the problem is the one Dalibor
pointed out: with Dumet wire the sputtering is very high. Also, since
I am using no noble gas (except for the less than 1 percent there is
in ambient air), the cathodes are having a much harder time anyway.
So for now I will not install these tubes in a permanent circuit
since they would only last for a few hours.
I will wait for my needle valve (will be here any day now) and try
with Neon (and some day with Argon, too, of course). The ignition
voltage should be drastically lower, and the visibility should increase.
The problem with stainless steel wire is that it outgasses; I have a
glow lamp with two stainless steel electrodes and it glows in a
white-ish blue color, very strange. Will post a picture later this
weekend if I don't forget.
Ah, by the way, I already have a small capacitor-based spot welder,
and so far, for my purposes, it has served me well:
http://www.robbe.de/welma-2000-punktschweissgeraet.html?___store=en
Jens
Keep up the good work !
If you need have some DXF files (vector format) on the digits you
want, or a image of the whole set, in a raster format, throw in my
direction. I'm in good with a guy that owns a steel cutting laser.
4000W of CO2 goodness. He'll run small jobs for me for nothing, as
long as I don't abuse it. That means pester him for work too often.
I still want that "1 - 12" "tri-quad" tube. 3 anodes x 4 cathode
sets (of 3).
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