Cliff/Karen Sandlin on sat 12 oct 02
Leslie: The firing schedule I use is from my Skutt User's Manual with
the top temp. increased from 2165 to 2199. It is as follows:
Segment 1 - 300 degrees/hr. to 1100 no hold.
Segment 2 - 500 degrees/hr. to 1915 no hold
Segment 3 - 108 degrees/hr. to 2165 (or 2199) with 10 min. hold
Segment 4 - 9999 degrees (default) hr to 1950 with 30 min. hold
Segment 5 - 150 degrees/hr. to 1100 no hold.
This took about 15 hrs. and pretty much eliminated the craters (after I
dremeled them down and applied a topcoat of Laguna Cone 5 Clear Bright
glaze (pretty thin). On some pieces, you can see where the craters were
under the clear glaze, but the pieces feel smooth and on a lot of pieces
this made them more interesting.
Karen
-----Original Message-----
From: Leslie Laurent [mailto:laurent@ncws.com]
Sent: Friday, October 11, 2002 11:48 PM
To: sandlink@bellsouth.net
Subject: Keeping on
Hi Karen,
I wonder all the time what keeps me going. I just know I would feel
worse if I quit. So I keep on. I can't do anything else. Maybe
therapy is the answer. When I sell some pots, I'll consider it.
Did you know Laguna B mix is cone 5? I'm pretty sure it is. Check
their web page. Wait, I'll do it now. .......................
http://www.lagunaclay.com/
yup. What do you think that means?
I decided to use the temperature charts as a guideline
and just go by the cones. I'll fire the thing to 3000 if
it bends a cone 6. I think Snail defined a cone 6
as a large cone bent to 3 o'clock. Ron Roy says
( in his book ) that he fires to cone 6 with tip touching.
Since my clay is Aardvark Arctic White and they say its
a cone 5 clay, for these tiles, I'm firing it to cone 5 with
the tip touching. Many potters consider that 5 1/2. I think
consistency is what I'm looking for. A clay and a set of glazes
that's functional at some as-yet-to-be-determined temperature.
I do have an electronic controller and am using Ron's ramp
hold schedule from their book - with no cool. But I have gotten
wildly different results just by loading the kiln differently.
I would like to see the firing schedule you used to eliminate
craters. Mine is 200/hr to 212 - no hold
500/hr to 2000 - no hold
150/hr to 2190 - hold 20 minutes ( I just
increased to 30) - will see tomorrow morning what that does.
By the way, this schedule works perfectly for me on vertical
ware. No craters or problems. It's just the flat items that are
giving me trouble. I read in Hamer and Hamer that dinnerware
manufacturers have 2 glazes. One for plates and saucers and
one for cups. And the answer is more flux.
Leslie
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