michael wendt on tue 5 sep 00
I too have had problems with large things going out of round when fired =
lip down. I found one solution that works well and is easy. If you have =
a slab roller, make a setter tile of the same clay you make your piece =
from. Cut it to a size slightly larger than the piece you'll keep. If =
you bisque fire the pieces you keep, bisqu fire the setter tile. When =
you fire, the tile shrinks at the same rate as the large piece and so =
keeps the distortion to a minimum. You can only use the tile one time. =
If you try to use it again, it has already shrunk and you are right back =
where you started which leads me to believe that distortion comes from =
small adhesion spots on the kiln shelf. Some people overcome this with =
sand or grog, but my way works well on even very thin, lerge items. Try =
it, it might work for you.
regards, Michael Wendt wendtpot@lewiston.com or =
http://www.wendtpottery.com
original message below
I've been making cone-shaped wall vases onto which I later throw a
decorative bottom extension so that it ends up being 14-16 inches long =
and
pointed at the bottom. When I glaze fire it upside down (of course), =
the
mouth has a tendency to become distorted, i.e. no longer round. I =
assume
that this is some air-trying-to-escape phenomenon. How can I counteract
this? I was wondering about Mel's technique of using grooves (cutouts?) =
in
the foot, only this time in the mouth. All ideas welcome.
-----Gail
Gail Dapogny
1154 Olden Road
Ann Arbor, MI 48103-3005
(734) 665-9816
gdapogny@umich.edu
www.silverhawk.com/ex99/dapogny
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