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forming a large diameter tube
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Permafacture  
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 More options 8 June, 08:09
Newsgroups: rec.crafts.glass
From: Permafacture <permafact...@gmail.com>
Date: Mon, 8 Jun 2009 00:09:38 -0700 (PDT)
Local: Mon 8 June 2009 08:09
Subject: forming a large diameter tube
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I was thinking about how to slump a large diameter tube from a flat
plane of glass.  I have little experience with glass working and dont
know to what degree this is workable...

You'd take a piece of float glass, from like a window and slump it
over a ceramic tube you made/found as a form.  Put it in the kiln and
let it soften and after its really gooy pull it out for a second and
use poles to roll the hanging edges together.  The maybe flip it so
the seam is on top and put it back in the kiln.

?

Is this at all how you would form a large diameter tube from found
resources?
What size kiln do glass workers usually have; what is the widest sheet
i might be able to work?
can it be anealed in the same kiln it was slumped in?

thanks!


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charlie  
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 More options 8 June, 18:19
Newsgroups: rec.crafts.glass
From: "charlie" <chania...@nospam.yahoo.com>
Date: Mon, 8 Jun 2009 10:19:19 -0700
Local: Mon 8 June 2009 18:19
Subject: Re: forming a large diameter tube
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"Permafacture" <permafact...@gmail.com> wrote in message

news:89597fca-9992-45cb-8b50-8216884c826f@f19g2000yqh.googlegroups.com...

kiln workers wouldn't do this. tubes are blown out in a glory hole. you can
take a flat piece, heat it in a glory hole, and use the technique called
'roll-up' to make it into a tube, but again, that would require blowing
experience.

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David Billington  
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 More options 8 June, 21:58
Newsgroups: rec.crafts.glass
From: David Billington <d...@djbillington.freeserve.co.uk>
Date: Mon, 08 Jun 2009 21:58:26 +0100
Local: Mon 8 June 2009 21:58
Subject: Re: forming a large diameter tube
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I'm no expert but I have seen pictures of large tube shaped parts
slumped from flat. The parts had a length maybe 5 times, from memory,
greater than the diameter, so what you require may be possible without
the roll up technique. The roll up sounds like the reverse of the old
tcchnique for producing flat glass where a cylinder was blown and split
an unrolled to form a flat sheet.

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nJb  
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 More options 11 June, 07:12
Newsgroups: rec.crafts.glass
From: nJb <n...@nowhere.com>
Date: Thu, 11 Jun 2009 00:12:53 -0600
Local: Thurs 11 June 2009 07:12
Subject: Re: forming a large diameter tube
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On Mon, 8 Jun 2009 00:09:38 -0700 (PDT), Permafacture

<permafact...@gmail.com> wrote:
>I was thinking about how to slump a large diameter tube from a flat
>plane of glass.  I have little experience with glass working and dont
>know to what degree this is workable...

>You'd take a piece of float glass, from like a window and slump it
>over a ceramic tube you made/found as a form.  Put it in the kiln and
>let it soften and after its really gooy pull it out for a second and
>use poles to roll the hanging edges together.  The maybe flip it so
>the seam is on top and put it back in the kiln.

Good luck. With a lot of practice you might pull it off. Most likely
you will wind up with a big mess and some burns.

>?

>Is this at all how you would form a large diameter tube from found
>resources?

No, I would either blow it (not likely to be called a tube), have it
blown, or buy it from a lab glass manufacturer.

>What size kiln do glass workers usually have; what is the widest sheet
>i might be able to work?

I have a 3x5' and a 4x8' but I wouldn't even try to slump a tube.

>can it be anealed in the same kiln it was slumped in?

Yes.

Jack


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Lauri Levanto  
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 More options 11 June, 09:51
Newsgroups: rec.crafts.glass
From: Lauri Levanto <lauri...@dnainternet.net>
Date: Thu, 11 Jun 2009 11:51:05 +0300
Local: Thurs 11 June 2009 09:51
Subject: Re: forming a large diameter tube
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The link below

http://www.lambertsglas.de/
has a video how big tubes are made.

Slumping over ceramics: The glass contracts more than ceramics while
cooling,
so it will break or at least press itself permanently around the ceramics.
Steel tube with a separator is better.

-lauri


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Permafacture  
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 More options 13 June, 05:26
Newsgroups: rec.crafts.glass
From: Permafacture <permafact...@gmail.com>
Date: Fri, 12 Jun 2009 21:26:24 -0700 (PDT)
Local: Sat 13 June 2009 05:26
Subject: Re: forming a large diameter tube
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All very helpful answers.

thanks!


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