Jorge Nabel on thu 9 may 02
Earl, can you share the ramp schedule you use for cone 11 firing in 6
hours????
Jorge Nabel
alfareriaurbana@sion.com
Earl wrote
I can get my Geil to over 1500 degrees F. without registering on the
pressure gauge
and still do a cone 11 firing in 6 hours. I would make a log of every
firing, just
nudge the gas up enough to be able to record the difference on the gauge.
Earl Brunner on fri 10 may 02
Who ever said I wanted to fire that fast? It's a screaming kiln. The last
three
firings I have done things to lengthen out the firing and to fire down some,
so far
I haven't noticed any huge changes in the outcomes of the pots. So far, the
things
that I have done to slow the firing down seem to have also contributed to a
more
uneven firing. I'm still playing with it.
Generally I check the kiln and nudge the gas up a bit every half hour to 45
minutes. At around 15 hundred degrees F. I begin body reduction, I shoot
for as
much reduction as I can get and still not lose temperature (stall is ok for
part of
the time). It's hard to get any back pressure registering at the bottom spy
hole.
Cantello Studios wrote:
> Why would any one what to fire so fast? Save gas?
> Firing this fast only keeps the glazes from forming all those wonderful
> colors.
> Or that's always been my feeling. 9 hr. maybe I like 11hr. better.
>
> Just thinking. Chris Cantello
>
> -----Original Message-----
> From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]On
> Behalf Of Jorge Nabel
> Sent: Thursday, May 09, 2002 4:06 PM
> To: CLAYART@LSV.CERAMICS.ORG
> Subject: cone 11 firing in 6 hours.
>
> Earl, can you share the ramp schedule you use for cone 11 firing in 6
> hours????
>
> Jorge Nabel
> alfareriaurbana@sion.com
>
> Earl wrote
>
> I can get my Geil to over 1500 degrees F. without registering on the
> pressure gauge
> and still do a cone 11 firing in 6 hours. I would make a log of every
> firing, just
> nudge the gas up enough to be able to record the difference on the gauge.
>
>
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>
>
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--
Earl Brunner
http://coyote.accessnv.com/bruec
mailto:bruec@anv.net
Cantello Studios on fri 10 may 02
Why would any one what to fire so fast? Save gas?
Firing this fast only keeps the glazes from forming all those wonderful
colors.
Or that's always been my feeling. 9 hr. maybe I like 11hr. better.
Just thinking. Chris Cantello
-----Original Message-----
From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]On
Behalf Of Jorge Nabel
Sent: Thursday, May 09, 2002 4:06 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: cone 11 firing in 6 hours.
Earl, can you share the ramp schedule you use for cone 11 firing in 6
hours????
Jorge Nabel
alfareriaurbana@sion.com
Earl wrote
I can get my Geil to over 1500 degrees F. without registering on the
pressure gauge
and still do a cone 11 firing in 6 hours. I would make a log of every
firing, just
nudge the gas up enough to be able to record the difference on the gauge.
____________________________________________________________________________
__
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
terry sullivan on sat 11 may 02
I'm wondering if anyone has actually done tests of various glaze types
fired at different speeds etc.
There are probably many glazes that need/ benifit from longer firing
times or special soak, ramp down firing.
However; there may be just as many glazes that perform as well, or maybe
even better, when fired very fast.
My narrow, but thorough, expirience firing aprox. half a dozen glazes
provided by a college in several different updraft kilns was that most
of the glazes could be fired quite fast with identicle results as the
slow firing. Once, just to see what would happen, I fired the load to
cone 10 in 3 1/2 hours start to finnish.
Body reduction and glaze reduction included. Stuff came out looking the
same as the 10 hour firings.
I've done cone 6 oxidation test firings in less than three hours with
fantastic results ( sometimes ).
Some thoughts for the discussion.
Terry Sullivan
Tom Buck on sat 11 may 02
Terry S:
Prof WM Carty of Alfred U, gave a presentation at NCECA KC on this
topic (rate of firing). He undertook research on the causes of pottery
defects. One thing he discovered was that both slow firing and fast firing
lead to defects. He recommended that potters find a middle ground for
firing their ware. If you are a NCECA member you can expect to see his
report in the annual Proceedings likely to be issued next January.
Tom Buck ) -- primary address. "alias"
or secondary address.
tel: 905-389-2339 (westend Lake Ontario, province of Ontario, Canada).
mailing address: 373 East 43rd Street, Hamilton ON L8T 3E1 Canada
ginny bivaletz on sun 12 may 02
earl - i don't know what kind of kiln you are firing,
but i had to change the orifice on my burners to a
smaller one to stop the problem of firing too fast.
i fire with propane. good luck with yours.
=====
ginny from orcas island, washington.
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