Karen Shapiro on tue 3 nov 98
I have a 24" 10-sided soft brick raku kiln with 2 large venture burners coming
in underneath, i.e. the flame shoots straight upwards under the shelf. I have
four 3" holes cut on top (centered). I seem to be having problems getting
enough airflow; I get some reduction going on during firing and have trouble
getting it up to temp. The shelf is elevated on half (hard) bricks. I have
experimented with covering certain top holes (presently I fire with 2 opposite
holes covered, which seems to work best). It is fired with natural gas.
Anyone have any suggestions? Most of my work is raku-fired sculpture and I
make my living (such as it is!) with my art. I sure could use some advice!
Thanks so much for any help you can give.
Karen
Clyde Tullis on wed 4 nov 98
Karen,
Natural gas, propane?
How much combustion space do you have under the shelf? Try raising it up a
couple inches. Fire with all the holes open and turn the gas up until you just
start seeing flame out the top.
Clyde
Karen Shapiro wrote:
> ----------------------------Original message----------------------------
> I have a 24" 10-sided soft brick raku kiln with 2 large venture burners coming
> in underneath, i.e. the flame shoots straight upwards under the shelf. I have
> four 3" holes cut on top (centered). I seem to be having problems getting
> enough airflow; I get some reduction going on during firing and have trouble
> getting it up to temp. The shelf is elevated on half (hard) bricks. I have
> experimented with covering certain top holes (presently I fire with 2 opposite
> holes covered, which seems to work best). It is fired with natural gas.
> Anyone have any suggestions? Most of my work is raku-fired sculpture and I
> make my living (such as it is!) with my art. I sure could use some advice!
> Thanks so much for any help you can give.
> Karen
Karen Shapiro on thu 5 nov 98
Hi Clyde,
Not propane, "regular" natural gas (I ran a line out to the raku yard). I
have about 4-1/2" under the shelf. My understanding is that if flame comes
out the top holes, there IS reduction going on.
Thanks for the advice; I'll try more space under the shelf.
Karen
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