mel jacobson on tue 20 jul 04
there can be many reasons, but a quick
test/fix can often be too much gas pressure.
when gas is too high, the bottom gets hot.
make some experiments:
increase gas pressure, see what happens.
reduce gas pressure, see where the heat goes.
turn up and down the two burners, see what happens.
i know i can move heat in my kiln.
often i do it by turning down the gas/up the air.
turn one burner on full, one on half.
i would have to fire with you to see the results
of each test.
but, see if you can get an oxyprobe for a firing.
see what happens.
mel
From:
Minnetonka, Minnesota, U.S.A.
web site: my.pclink.com/~melpots
or try: http://www.pclink.com/melpots
new/ http://www.rid-a-tick.com
Nancy Jonnum on tue 12 oct 10
A really long time ago I asked for advice on how to change a glaze to
mature at a slightly lower temperature. I was looking for this glaze
because my kiln was firing about 1 cone lower on the bottom. I
received lots of good advice, and I offer a belated thank you to all
who were helpful.
Some people suggested that I try to fire the kiln more evenly. They
suggested I fire more slowly and hold the temperature for a while at
the end of the firing. But I was already doing those things. Somewhere
along the line I read Nils Lou's book on kiln firing. Nils seems to
feel strongly that many kilns have flues that are too large. I tried
putting an insulated fire brick in front of the flue. This seems to be
working. I haven't fired it enough times to be sure, but I think I'm
getting more even results.
I would like to read more discussion about even (and uneven) kiln
firing.
Thanks again to all who have offered advice on this subject.
Nancy
David Woof on wed 13 oct 10
Nancy=3D2C I remember your question.
You are on the right track. The standout thing to recognize between those a=
=3D
sking and those telling is that at one time those telling were asking and t=
=3D
hen thinking=3D2C trying things and sharing their discoveries. In fact th=
e =3D
"experts" we look to for answers are such because they've never stopped ask=
=3D
ing. Those in both camps who fail to exercise this curiosity=3D2C courage =
an=3D
d fortitude or hoard their knowledge get sidelined or washed up somewhere i=
=3D
n the backwaters.=3D20
=3D20
The conundrum I sometimes feel when I read one more question to which answe=
=3D
rs abound in the archives is resolved when I remind myself that in "oh here=
=3D
we go again threads" new knowledge may come forth from this new round of a=
=3D
past beaten to death subject. So I'm in because my mind is hungry and I =
=3D
thrive on a the possibility that a new pearl got overlooked in last nights =
=3D
oyster shucking.=3D20
=3D20
So while the archives have much of value=3D2C keep posting your questions =
an=3D
d experiences as well. Don't go away now satisfied because you got your qu=
=3D
estion answered. For that you now owe the list a future shareing of someth=
=3D
ing you have learned or discovered. Stay with us.
David Woof
__________________________________________
Date: Tue=3D2C 12 Oct 2010 13:49:41 -0700
From: Nancy Jonnum
Subject: Uneven kiln firing
=3D20
A really long time ago I asked for advice on how to change a glaze to
mature at a slightly lower temperature. I was looking for this glaze
because my kiln was firing about 1 cone lower on the bottom...... Nils seem=
=3D
s to
feel strongly that many kilns have flues that are too large. I tried
putting an insulated fire brick in front of the flue. This seems to be
working.
I would like to read more discussion about even (and uneven) kiln
firing.
=3D20
=3D20
=3D
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