Christopher Anton on sat 23 sep 00
Thinking about the many discussions we have had about the fact that =
cones serve to show energy absorption, whereas pyrometers show spot =
temperature readings a (rare, I know!) thought occurred.
In firing to vitrification, we basically use cones that bend over when =
our clay body (depending on thickness) should have vitrified. To me, =
this says that the cone has gone up to or just beyond its own =
vitrification point. If this is indeed the case, why not make our own =
cones from the clay we are firing?
- Chris
Larry Phillips on sat 23 sep 00
Christopher Anton wrote:
>
> In firing to vitrification, we basically use cones that bend over when our clay body
> (depending on thickness) should have vitrified. To me, this says that the cone has gone
> up to or just beyond its own vitrification point. If this is indeed the case, why not
> make our own cones from the clay we are firing?
Because when the cone slumps, so will our pots. A cone should slump at
the right temperature, but your pot should vitrify. If your pot does
what the cone does, you have gone too far.
--
Hukt on fonix werkt fer me!
http://cr347197-a.surrey1.bc.wave.home.com/larry/
Snail Scott on sat 23 sep 00
>... why not make our own cones from the clay we are firing?
If the cone bends, the clay will do the same. I don't want my work quite
as vitrified as that! You might try making cones from a clay body with a
lower firing range, and see when they tip, using commercial cones to
compare.
-Snail
Paul Kaye on sun 24 sep 00
I think you are on the right track but what I have been thinking is to flux
the clay body with ground glass (found at a sandblasting supply store) this
would be similar to a frit. All of your ingredients could be ball milled or
passed through a fine mesh screen and make sure you have enough to do simple
line tests and make a year (or four) supply of cones.Fluxing the body is
important so that you get enough warning before your work is overfired. Test
your cones beside the cones you usually use.
"The Potters Alternative" by Harry Davis is a good source for this info.
PK
Chris said
>
>In firing to vitrification, we basically use cones that bend over when our
>clay body (depending on thickness) should have vitrified. To me, this says
>that the cone has gone up to or just beyond its own vitrification point.
>If this is indeed the case, why not make our own cones from the clay we are
>firing?
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