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Re: Single electrode

Posted By: John Dragun
Date: Sunday, 26 February 2012, at 3:34 p.m.

In Response To: Re: Single electrode (SVP Neon Equipment)

Ugh.

> Yes, he would have tremendous difficulty
> trying to seal soft glass to hard glass,
> especially considering that it cannot be
> done directly. The COE's are completely
> different.

> Beer, liquor, wine bottles, etc., are
> typically soda glass, which can be directly
> sealed to lead or lead-free neon electrodes,
> though it will not be easy and will require
> at least an exceptional flame annealing
> technique, but should be oven annealed.

> The piece will require oven processing to
> heat the glass, and induction heating to
> heat the single electrode. Typical internal
> bombarding would not be possible with a
> single electrode, nor would it be very
> effective even with two electrodes because
> of the size and mass of the vessel.

> You will need a single end power supply
> (think of how a spark tester works). I do
> not know much about them as I have never
> delved into single ended pieces, but I
> believe Tech 22 has some available.

> You will need to have a vacuum line going
> into the oven to connect the piece to for
> evacuation and filling. This of course will
> have to be soft glass so you can make a
> glass to glass seal to the tubulated
> electrode. Once the line is outside the oven
> you can use compression fittings like those
> on your manifold to make connections to
> other things such as the vacuum and filling
> manifold you will need.

> The basic situation would be: Once the piece
> is made, put it in the oven, connect it to
> the vacuum line. Start pulling a vacuum.
> Turn the oven on and bring it up to
> annealing temperature
> while continuing to pump. Let soak at
> temperature for at least 30 minutes. Turn
> oven off to begin cooling. When the oven
> cools to ~300C, open oven, reach in with
> induction heater (you may want to put
> something over your arm and hand) and heat
> the electrode. Close oven and continue
> pumping until oven cools to 50-75C. Open
> oven, fill unit to desired pressure with
> desired gas and tip off unit with hand
> torch. Connect unit to power supply.

> Hope I didn't leave anything out, but that
> will give you a general idea of what's
> involved.

> Mark

Messages In This Thread

• Single electrode -- John Dragun -- Saturday, 25 February 2012, at 1:58 a.m.
  • Re: Single electrode -- chris.oh -- Saturday, 25 February 2012, at 11:21 p.m.
    • Re: Single electrode -- John Dragun -- Sunday, 26 February 2012, at 2:38 a.m.
    • Re: Single electrode -- SVP Neon Equipment -- Sunday, 26 February 2012, at 2:30 p.m.
      • Re: Single electrode -- John Dragun -- Sunday, 26 February 2012, at 3:34 p.m.
        • Re: Single electrode -- Tom U. -- Sunday, 18 March 2012, at 3:14 a.m.

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