Peter Coates on wed 24 mar 04
Hello All
Well I built a small gas kiln loosely based on the Oregon Flat Top..( =
it's smaller)...
Fired it for the first time on Monday... fired in five hours cold to =
finish cone 10 ... did not mean to fire that fast... I don't have a =
pyrometer yet, I didn't know it was climbing in temp that fast. The =
whole load was Malcolm Davis shino...
This was my first time firing a down draft.
I have some questions.
The kiln was even top to bottom but, there was about a half a cone =
difference between the front of the kiln (flue and burner port side) and =
the back of the kiln. How would someone go about evening that out.?
Also, I got beautiful Davis shino, gold, orange with carbon trapped =
edges, except on the very bottom shelf. The bottom shelf got 0 =
reduction, goose egg, nadda... no body reduction ....nothing.... The =
bottom shelf was placed right on the bottom of the kiln floor, which is =
even with the burner port floor and the flue floor. Now this was my =
first firing... so it could be pilot error...
Any advice any one can give would be much appreciated...
Thanks=20
Peter in Oklahoma City
sdr on thu 25 mar 04
Pete said:
........ built a small gas kiln loosely based on the Oregon Flat Top..( it's
smaller)...
Fired it for the first time on Monday... fired in five hours cold to finish
cone 10 ... did not mean to fire that fast... I don't have a pyrometer yet,
I didn't know it was climbing in temp that fast.........
Hi, Pete - haven't heard from you in a while. Good to know
your little flat top fired off with only minor problems. I expect
that your bottom shelf, being right in front of the exit flue, simply
got more oxygen - or less carbon - than the rest. That is pretty
common with flat-tops. You can dink around with it and maybe
get it evened out. Or you can fire your green glazes down
there, they'll come out great.
I think when you slow down your firing you'll get even
temps; turn those burners down, come up slow, and
all should be well. And - a half-cone isn't bad, anyway.
regards
Dannon Rhudy
Craig Martell on thu 25 mar 04
Hi Pete:
5 hours is a fast fire to cone 10. If you slow the climb and run a 10 hr
fire you may find that everything evens out better. I would raise the
bottom shelves at least an inch or two off the floor. I think you'll get
better results.
regards, Craig Martell Hopewell, Oregon
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