WALLY ASSELBERGHS on tue 7 oct 03
Hi all,
Here's a question from "little sister" nakedraku listserv.
One of our members inquired about the possibillity of reducing heavy raku pieces right inside a top-loading fibre kiln.
Of course there is the alternative of using a lift-off fibre-wiremesh kiln, and placing an empty container with reduction material on the firebox when reaching temperature.
But the option to just throw in reduction material looks appealing..Against all rules. ...
If done say only once....The tar deposit might just burn away upon next oxidising firing..... On the other hand, I presume consecutive firings with this method would seriously harm the fibre lining, not to speak of corrosion to the fibre-glue and the metal of the kilndrum itself......
Has any of the raku-experts on Clayart ever tried this option, or any thoughts or opinions on this ?
Thanks,
Wally.
Original message
================
Hi Everybody,
I've got some rather large naked raku pieces that I am going to be
firing soon and while I have been lifting weights and doing my aerobic
pot lifting exersizes Im wondering about reducing these pieces right in
the kiln. I fire a fibre lined top-loading kiln with a single venturi
burner and am considering pulling the burner away letting things cool
down some then putting combustibles into the burner port while shutting
off the air all around. Will the carbon hurt the fiber lining? On other
occasions when I have had a "dirty fire" the carbon burns right off as
soon as I add more air. Also it will hit and miss on temperature, since
I dont have a pyrometer. It could be a pretty heavy reduction since I
wont be able to pull the piece after 10 minutes, just open it up and let
it cool and reoxidize? if its too hot.
Any thoughts on this? Any suggestions or experience will be of interest.
I have built several sorts of racks and tongs for moving big or awkward
pieces but why not reduce in the kiln?
Virginia
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Craig Dunn Clark on thu 9 oct 03
Wally, the one thing that I discovered from my sole attempt to reduce in
place (inside a fiber kiln) was that there was not a quick enough drop in
temperature for my purposes. I was after a glossy copper look at the time
and there was re-oxidaiton that I just couldn't stop. The other problem was
that I did not get enough crazing in the crackle I was using.
In the case of "naked-raku" if all you are after is the carbon burn in
then it may very well work. The question I have is why do it? If the pieces
aren't to large and heavy to move without difficulty why not just place them
in a post reductionon firing chamber and get on to the next firing of the
kiln?
Craig Dunn Clark
619 East 11 1/2 st
Houston, Texas 77008
(713)861-2083
mudman@hal-pc.org
----- Original Message -----
From: "WALLY ASSELBERGHS"
To:
Sent: Tuesday, October 07, 2003 2:25 PM
Subject: Reducing raku inside a kiln
> Hi all,
> Here's a question from "little sister" nakedraku listserv.
> One of our members inquired about the possibillity of reducing heavy raku
pieces right inside a top-loading fibre kiln.
> Of course there is the alternative of using a lift-off fibre-wiremesh
kiln, and placing an empty container with reduction material on the firebox
when reaching temperature.
> But the option to just throw in reduction material looks
appealing..Against all rules. ...
> If done say only once....The tar deposit might just burn away upon next
oxidising firing..... On the other hand, I presume consecutive firings with
this method would seriously harm the fibre lining, not to speak of corrosion
to the fibre-glue and the metal of the kilndrum itself......
> Has any of the raku-experts on Clayart ever tried this option, or any
thoughts or opinions on this ?
> Thanks,
> Wally.
>
> Original message
> ================
> Hi Everybody,
> I've got some rather large naked raku pieces that I am going to be
> firing soon and while I have been lifting weights and doing my aerobic
> pot lifting exersizes Im wondering about reducing these pieces right in
> the kiln. I fire a fibre lined top-loading kiln with a single venturi
> burner and am considering pulling the burner away letting things cool
> down some then putting combustibles into the burner port while shutting
> off the air all around. Will the carbon hurt the fiber lining? On other
> occasions when I have had a "dirty fire" the carbon burns right off as
> soon as I add more air. Also it will hit and miss on temperature, since
> I dont have a pyrometer. It could be a pretty heavy reduction since I
> wont be able to pull the piece after 10 minutes, just open it up and let
> it cool and reoxidize? if its too hot.
> Any thoughts on this? Any suggestions or experience will be of interest.
> I have built several sorts of racks and tongs for moving big or awkward
> pieces but why not reduce in the kiln?
> Virginia
>
>
>
> ---------------------------------
> Do you Yahoo!?
> The New Yahoo! Shopping - with improved product search
>
>
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