Kathy McDonald on fri 3 jun 05
bisque firing in gas kiln.?
I posted a message to the laist about a week ago asking for
some opinions on bisque firing in the gas kiln as my electric ones are
old and need elements replaced badly.
I went ahead and bisqued about 100 pots in the gas kiln.
Used cones and the DDE controller. Kept it oxidizing the whole way and
fired very very slowly.... not more than a 50 degree per hour rise for the
entire bisque. Clays and glazes were ones I have used for over 20 years so
i do not believe them to be the factor.
The bad news is....I fired a glaze load and almost 30% of the pots in the
glaze load are dunted. The only difference between this load and the dozens
of loads that have been fired in the same kiln is the bisque firing.
My question is:
Should I rebisque the remaining 40 or so pots in the electric kiln and does
anyone think this might have a chance of fixing the problem.?
Do others use a gas kiln to bisque and if so what reccomendations would you
have for me?
TIA
Kathy McDonald
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Earl Brunner on fri 3 jun 05
bisque firing in gas kiln.?
I only have a gas kiln, and have seldom been in a situation where I had an
electric to bisque in. Have had to be a bit more careful about the preheat,
but other than that, and the occasional pot that gets a little "burnt" on
the flame side, no real problems.
Earl Brunner
Las Vegas, NV
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Kathy McDonald
Sent: Friday, June 03, 2005 4:25 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Dunting and warping in Glaze fire: Is there any relationship to
bisque firing in gas kiln.?
My question is:
Should I rebisque the remaining 40 or so pots in the electric kiln and does
anyone think this might have a chance of fixing the problem.?
Do others use a gas kiln to bisque and if so what reccomendations would you
have for me?
TIA
Kathy McDonald
Pfeiffer, Dan R (Dan) on fri 3 jun 05
bisque firing in gas kiln.?
>>>Do others use a gas kiln to bisque and if so what reccomendations would
you
have for me?>>>
We do all our firing in a gas kiln and have not had a problem with the
bisque. We do fire a lot faster than you did, 150/h up to 1100f and then
250/h up to about ^07 and than a long slow rise up to ^05.
Dan & Laurel in Elkmont Al
Potters Council Members
Ron Roy on sat 4 jun 05
bisque firing in gas kiln.?
Hi Kathy,
Did the cracing happen on the way up or on the way down?
If the edges of the glaze at the crack are sharp they happened on the way
down in the glaze firing.
If they are not sharp they may have happened on the way down in the bisque
firing. Could it be the damper on your gas kiln is not closing properly?
RR
>I posted a message to the laist about a week ago asking for
>some opinions on bisque firing in the gas kiln as my electric ones are
>old and need elements replaced badly.
>
>I went ahead and bisqued about 100 pots in the gas kiln.
>
>Used cones and the DDE controller. Kept it oxidizing the whole way and
>fired very very slowly.... not more than a 50 degree per hour rise for the
>entire bisque. Clays and glazes were ones I have used for over 20 years so
>i do not believe them to be the factor.
>
>The bad news is....I fired a glaze load and almost 30% of the pots in the
>glaze load are dunted. The only difference between this load and the dozens
>of loads that have been fired in the same kiln is the bisque firing.
>
>My question is:
>
>Should I rebisque the remaining 40 or so pots in the electric kiln and does
>anyone think this might have a chance of fixing the problem.?
>
>Do others use a gas kiln to bisque and if so what reccomendations would you
>have for me?
>
>TIA
>
>
>Kathy McDonald
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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