09/14/2009 (3:27 pm)
Clay Day Firing
Firing the clay day pieces was challenging. The first attempt was made on Labor Day weekend, and was cut short by rain. I tried to regain the firing but the temperature rose too quickly, and I had to shut the kiln down, leaving the pieces underfired. The second firing was yesterday, and was successful. I hope the kids (and grownups!) are as pleased with their pieces as I am.
Here are a few favorite “other” pieces from the firing.
Plant pot:
Soap dishes:
Spoon rests:
I am still having temperature variance issues with the kiln. The cones on the right were in the top, and in fact, the pieces that were on the top shelf will have to be refired. I think I’ll need to start leaving that top shelf empty if it is too close to the top. It only had about five inches clearance from the lid and it just doesn’t get hot enough up there. Getting more studio time in the new year should help, since I’ll have more variety of sizes and shapes to stack into the kiln, as well as more practice using it.
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Sounds like you have a heat leakage issue, how can the top be so porous?
Hi Dan! - The fire bricks used in kilns is very porous material. That is not what causes the uneven temp in this kiln, though. The three burners are located at the bottom of the kiln, and stacking the shelves so the flames make their way back and forth between them is a challenge. If I just stack them evenly, the flames essentially go up the outside of the shelves and the bottom gets very hot, and the top doesn’t get hot enough. The trick is to try to keep the flames from escaping the top too quickly, so heat builds up there as well. The challenge, though, is to not restrict the flames at the exhaust vent, or I’ll cause a reduction, which changes the outcome of the glazes. It’s always a challenge!
Comment by Dan Backen — September 14, 2009 @ 6:24 pm