janet & shan on tue 3 mar 98
I'd like to hear from any one with experience firing bisque in a portable
(i.e. 23/27 etc.) updraft kiln. I am new to the list and have looked thru
the archive to no avail. If this has already been covered please excuse. If
you would like to mail direct I'm at . Thanks Shan
Michael Torok on wed 4 mar 98
I would also greatly appreciate any info on this subject. I've recently
purchased an olympic 1827g and have had no luck firing bisque. No problem once
the work is bisqued in another kiln (a little (really a test) electric kiln).
I'd really like to bisque more work at a time than this current method
allows--and to actually use the kiln for most of my firing in general. Is
there a certain stacking method maybe? Where shelves must go. I use two half
shelves at the bottom, about two inches up, as a full shelf and another two (as
a full shelf) an inch and a half from the flue.
Thanks,
Michael
mat1368@usl.edu
janet & shan wrote:
> ----------------------------Original message----------------------------
> I'd like to hear from any one with experience firing bisque in a portable
> (i.e. 23/27 etc.) updraft kiln. I am new to the list and have looked thru
> the archive to no avail. If this has already been covered please excuse. If
> you would like to mail direct I'm at . Thanks Shan
Joy Alandete on wed 4 mar 98
Hi Shan,
I, too, am looking for information on bisquing in this manner. I just
bought a used California Kiln and I'd be happy if you would forward
anything interesting to me. Meanwhile, as I experiment, I'll let you know
my experiences.
Thanks. Miguel in snowy Pennsylvania
jalandete@mindspring.com
At 01:00 PM 3/3/98 EST, you wrote:
>----------------------------Original message----------------------------
>I'd like to hear from any one with experience firing bisque in a portable
>(i.e. 23/27 etc.) updraft kiln. I am new to the list and have looked thru
>the archive to no avail. If this has already been covered please excuse. If
>you would like to mail direct I'm at . Thanks Shan
>
John H. Rodgers on thu 5 mar 98
-- [ From: John H. Rodgers * EMC.Ver #2.5.02 ] --
Bisque in a gas kiln? It must be done, but I don't know a single potter that
fires bisque in a fuel fired kiln. I am curious about this also!!
John Rodgers
In Alabama
-------- REPLY, Original message follows --------
Date: Wednesday, 04-Mar-98 12:19 PM
From: Michael Torok \ Internet: (mat1368@usl.edu)
To: Clayart \ Internet: (clayart@lsv.uky.edu)
Subject: Re: Updraft Bisque ??
----------------------------Original message----------------------------
I would also greatly appreciate any info on this subject. I've recently
purchased an olympic 1827g and have had no luck firing bisque. No problem
once the work is bisqued in another kiln (a little (really a test) electric
kiln). I'd really like to bisque more work at a time than this current
method allows--and to actually use the kiln for most of my firing in general
.. Is there a certain stacking method maybe? Where shelves must go. I use
two half shelves at the bottom, about two inches up, as a full shelf and
another two (as a full shelf) an inch and a half from the flue.
Thanks,
Michael
mat1368@usl.edu
janet & shan wrote:
> ----------------------------Original message----------------------------
> I'd like to hear from any one with experience firing bisque in a portable
> (i.e. 23/27 etc.) updraft kiln. I am new to the list and have looked thru
> the archive to no avail. If this has already been covered please excuse.
If
> you would like to mail direct I'm at . Thanks Shan
-------- REPLY, End of original message --------
Jonathan Kaplan on fri 6 mar 98
>----------------------------Original message----------------------------
>-- [ From: John H. Rodgers * EMC.Ver #2.5.02 ] --
>
>Bisque in a gas kiln? It must be done, but I don't know a single potter that
>fires bisque in a fuel fired kiln. I am curious about this also!!
>
>
You have to be kidding. I've fired, and continue to fire, bisque in my gas
kiln as I have done since the very early 1970's. Surely you jest......I am
not trying to be facicious or rude, but where is both the logic and common
sense of "not" firing bisque in a gas kiln?
I sure am glad to pay my gas company a fraction of the cost of using their
goods and services than those of the competing electric company in my
area.
Jonathan
Jonathan Kaplan, president jonathan@csn.net
http://www.sni.net/ceramicdesign/
Ceramic Design Group Ltd./Production Services
PO Box 775112
Steamboat Springs CO 80477
(USPS deliveries only)
Plant Location
1280 13th Street Unit 13
Steamboat Springs CO 80487
( UPS, courier, and common carrier deliveries)
(970) 879-9139*voice and fax
http://www.sni.net/ceramicdesign/
http://digitalfire.com/education/clay/kaplan1.htm
DEBBYGrant on fri 6 mar 98
When I was head of the ceramic department of our local art institute
I fired bisque in our updraft Alpine for years because that was the
only kiln we had. There was absolutely no problem. I would light
the pilots in the evening and let it go all night on pilot with the peep
holes open, then come in the morning to turn on the main jets and
fire very slowly to ^08 in oxidation of course since you wouldn't
start reduction at that temp anyway. I believe they are still firing
bisque in it for very large pieces that won't fit in the electric kiln.
I don't know why anyone should think this is a problem.
Debby Grant in NH
CShie673 on fri 6 mar 98
Every so often, something makes you question something that you completely
take for granted and never think twice about. At San Diego State University
we have two Alpine 30 cubic foot updraft gas kilns, which we use for 06 bisque
and cone 10 glaze. If there are more pots than space in the gas kilns, we'll
put the rest of the stuff in one of our smaller electrics. Until I read this
post I never gave much thought as to why we prefer the gas bisque. It's a
pretty easy way to fire...I'm a novice to gas firing, but I've never had a
problem bisquing this way...high fire, yes; bisque, no. Can anyone explain
how clay might be affected differently by gas and electric bisque?
JFTRT on sat 7 mar 98
This is a reply to those wondering about a gas fired updraft to bisque c/08 temp
For several years I fired greenware to bisque temps and found it just fine, but
me make my case. I was told that the sulphur that was given off the green-
ware during bisque temps attacked and would eventually destroy the kiln elements
so when I got a grant for the purchase of a kiln at the university that I was
teaching at (and keep thost "post-tenure" folks away from me!) I picked a kiln
from the main reasoning of durability. So a 24 cu. ft. updraft-hole in top-load
stainless sheath outside job. Gas was quite cheap and so I would go slow to avo
blowing up ware. The kiln was outside, in a humid environment no less,
and I found everything worked well. Normal stacking; just careful management
of the fire.
Todd Turek
Juneau, Alaska-we know rain.
John H. Rodgers on sat 7 mar 98
-- [ From: John H. Rodgers * EMC.Ver #2.5.02 ] --
Jonothon. I'm serious with the question. Every single potter that I know
personally....face to face, fires bisque in electric kilns only and reserves
the gas or whatever for glaze firing. I kinda got the idea there was some
good reason for it, though it didn't seem logical. With my limited
knowledge, I just assumed I was missing something.
Nice to know I can bisque and glaze fire in the same gas kiln. When my
electric dies (its very old) I will replace with a fuel fired kiln.
John Rodgers
In Alabama
-------- REPLY, Original message follows --------
Date: Friday, 06-Mar-98 08:29 AM
From: Jonathan Kaplan \ Internet: (jonathan@csn.net)
To: Clayart \ Internet: (clayart@lsv.uky.edu)
Subject: Re: Updraft Bisque ??
----------------------------Original message----------------------------
>----------------------------Original message----------------------------
>-- [ From: John H. Rodgers * EMC.Ver #2.5.02 ] --
>
>Bisque in a gas kiln? It must be done, but I don't know a single potter
that
>fires bisque in a fuel fired kiln. I am curious about this also!!
>
>
You have to be kidding. I've fired, and continue to fire, bisque in my gas
kiln as I have done since the very early 1970's. Surely you jest......I am
not trying to be facicious or rude, but where is both the logic and common
sense of "not" firing bisque in a gas kiln?
I sure am glad to pay my gas company a fraction of the cost of using their
goods and services than those of the competing electric company in my area.
Jonathan
Jonathan Kaplan, president jonathan@csn.net
http://www.sni.net/ceramicdesign/
Ceramic Design Group Ltd./Production Services
PO Box 775112
Steamboat Springs CO 80477
(USPS deliveries only)
Plant Location
1280 13th Street Unit 13
Steamboat Springs CO 80487
( UPS, courier, and common carrier deliveries)
(970) 879-9139*voice and fax
http://www.sni.net/ceramicdesign/ http://digitalfire.
com/education/clay/kaplan1.htm
-------- REPLY, End of original message --------
Cindy on sun 8 mar 98
John,
Bisque should be fired in an oxidation or at least a neutral atmosphere.
It's just easier to do this in an electric kiln. That was my understanding
of the reason potters often elect to bisque fire in an electric kiln.
Convenience, too, I suppose. Since you can fit a lot more bisque than glaze
ware into a kiln, you could bisque in a smaller (probably electric) kiln
and end up with enough glazed ware to fill up your larger fuel kiln.
Cindy Strnad
Earthen Vessels
Custer, SD
USA http://blackhills-info.com/a/cindys/menu.htm
Ron Roy on mon 9 mar 98
Just to make sure every one understands some fine points here.
Clays which have iron in them - either in chunks from fireclay or fine iron
from clays like red art must have a excess of oxygen in the kiln between
700C and 900C to make sure the iron is not reduced as any organic material
is released from the body. This process does happen in electric kilns and
can happen easier because there is little air flow through an electric -
except where the vent systems are used - in this case extra oxygen is
continually entering the kiln - The carbon content in some clays is
unpredictable - some varieties have more than others and this information
is usally available from the mine.
Fast firing through this crucial stage can reduce Fe3O2 to FeO - you don't
want that. How fast is fast - everyone will have a different answer - I say
it depends on the carbon content in the clay, how tightly the kiln is
stacked, how thick the ware is and how tight the kiln is. Best to go slow
and cover the eventuallities - I say 50C per hour but - as I say it depends
on several factors. If you do reduce the iron - your body will be over
fired to some extent - one of the sure signs is glaze blisters that won't
go away when fired again - and some times get worse
If there is not enough oxygen in the kiln - and you put in something that
will burn - you will not see flame in the kiln. Mind your eyebrows now.
In a gas kiln there is always "new" air (oxygen) being drawn into the kiln.
All you need to do is make sure your burners are not reducing and give the
organics in the clay time to get out.
>Bisque should be fired in an oxidation or at least a neutral atmosphere.
>It's just easier to do this in an electric kiln. That was my understanding
>of the reason potters often elect to bisque fire in an electric kiln.
>Convenience, too, I suppose. Since you can fit a lot more bisque than glaze
>ware into a kiln, you could bisque in a smaller (probably electric) kiln
>and end up with enough glazed ware to fill up your larger fuel kiln.
Ron Roy
93 Pegasus trail
Scarborough Otario
Canada M1G 3N8
Phone: 416-439-2621
Fax: 416-438-7849
Web page: Home page http://digitalfire.com/education/people/ronroy.htm
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