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Lesson Plans

Re: Lava Melt down in Kiln

[ Thread ][ Subject ][ Author ][ Date ]
Numo Jaeger & Michael Miller (jaegmil)
Tue, 01 Jun 1999 17:13:11 -0700

(I lost the e-mail address of the person who asked this question.)

When the kiln is extremely over fired the soft bricks become hard. This
makes the kiln less energy efficient and the bricks brittle. Brittle bricks
makes it harder to replace elements. This does not necessarily mean that
the kiln is no good anymore. Maybe, maybe not. Check the elements to see if
they still work. Do they get red Hot when you turn them to high? You may
have just shorten the kilns life span...Hey, it happens...we are human.

When clay melts on the shelves sometimes it can be chipped off. Sometimes
the shelf just can't be saved. Same thing goes for the wall and floor of
the kiln. Save the shelve parts for the times when you need to stack that
questionably glazed piece in the future.

You CAN flip the bottom of the kiln over and use the other side. Who cares
what the bottom of the kiln looks like? Some holes can be patched with kiln

Always put an extra kiln shelf on the bottom of the kiln. You never know.
Glaze and melted clay just "eat" soft brick. It soaks deeper and deeper
into the bricks each firing.

Check all your switches to see if they are still working. Sometimes that
much heat melts the relays in the switch boxes. They are pretty easy to
repair though.

Make sure that the cone sitter really works.

Always USE the timer on your kiln. (if you have one) When you have fired
the kiln multiple times you should know approximately how long your kiln
will take to do a firing. Allow that much time on the timer. If you need
more info on that let me know. I will try to help.

If you ave any other questions e-mail me again and I will try to answer
them if I know the answer.


Numo Jaeger
Studio One Art Center
Oakland CA