Hi,
interesting, the little blue something ;-) burner looked more like a
glass blowing burner to me.
Jens
Hi, I use torch from hardware shop, for soldering. It was the
strongest one, gas-air..
More later on site..
Dalibor
Dalibor Farny
http://dalibor.farny.cz
Sent from my HTC
------------------------------------------------------------------------
From: jb-electronics <webmas...@jb-electronics.de>
Sent: Monday, June 18, 2012 0:11
To: neonixie-l@googlegroups.com
Subject: Re: [neonixie-l] Soda lime - small success
Hi,
good work on the small glow lamps! What kind of burner do you use?
Jens
Nice information about making stems are in the Roth's book noticed
recently here.. "Vacuum sealing techniques", for those interested in
this book, let me know outside, I will post link..
I have already got a small test mold made from graphite, 13-pin.. My
original intention was to arrange some kind of furnace in microwave
oven and melt the glass directly in the mold with dumet wires
inside.. But no luck yet, I am able to heat a piece of the carbide to
1000C, but the power is to small to heat all the mold with glass.
Another thing is, that at this temperature, the graphite reacts with
oxygen producing CO2 and degrades.. I think 10 cycles is maximum for
one mold. The furnace with controlled atmosphere (nitrogen, argon,
CO2 ..) would be the best.. I am going to ask my friend to test that
process in their lab, he has a special tubular furnace able to go
above 2000C ;-)
I am preparing some short blogpost about my fail ;-) I will publish
it tonight. Except that, I had also some small success, sealed argon
tubes.. that post is already done:
http://dalibor.farny.cz
Dalibor
2012/6/17 Dalibor Farnı <dali...@farny.cz <mailto:dali...@farny.cz>>
Hi John,
are You sure that only gravity is enough for the glass to flow to
the mold? At what temperatures? I tried 800C and no luck..
Dalibor
2012/6/17 John Rehwinkel <jreh...@mac.com <mailto:jreh...@mac.com>>
> How exactly would you proceed making - say - 13 pin tube
bases? You need a lot of temperature for that and precisely
formed tools. So far this is nothing I can see myself doing
in the near future. I know a person who makes his own
(borosilicate glass) sockets, I might be able to adopt the
principle some day.
The tool part isn't too tough, just carve it out of graphite
with pin recesses. CNC machining would be the way I'd go,
but back in the day it
was done by reading scales on handwheels, and obviously it
could still be done that way. Once you have your graphite
mold/pin holder,
get some nice 3-part pins and lead glass tubing of an
appropriate diameter. Lead glass is the way to go here - it
liquifies enough to
gravity flow into molds like this. Slice off rings that have
sufficient glass to make your bases, drop pins into your
mold, put the glass ring
around them, and melt the whole shebang. For extra niceness,
you can have an upper mold half that forms little mounds of
glass over
the pins themselves and flattens the rest of the base into a
disc. Let it cool, and violà! The first one will be a real
bear, as you have to
make the molds determine the amount of glass, temperature to
use, etc. But once you have the molds made and the procedure
down,
you can knock out additional bases fairly easily.
- John
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