John Fazzino on wed 16 dec 98
Anyone have any ideas about how to get a more even firiing in a gas,
downdraft, Bailey, car kiln. The kiln is rectangular in shape, lined with
fiberfax, has 3 shelves wide and 3 shelves deep. Two burners are in the back
and hit a target brick. This kiln is used in a college setting and is
outfitted with a digital thermostat and soaking mechinism. We fire up to cone
10 and get cone 9 just going down at top while 10 is flat on bottom. Any
thoughts to help would be appreciated. Thanks
John, Providence
clennell on thu 17 dec 98
>----------------------------Original message----------------------------
>Anyone have any ideas about how to get a more even firiing in a gas,
>downdraft, Bailey, car kiln. The kiln is rectangular in shape, lined with
>fiberfax, has 3 shelves wide and 3 shelves deep. Two burners are in the back
>and hit a target brick. This kiln is used in a college setting and is
>outfitted with a digital thermostat and soaking mechinism. We fire up to cone
>10 and get cone 9 just going down at top while 10 is flat on bottom. Any
>thoughts to help would be appreciated. Thanks
>
>John, Providence
+
Dear John: We have owned two Bailey kilns and usually fire them with less
than a half a cone difference top to bottom. If the top is cool and the
bottom hot move the target brick closer to the burner to direct the heat
up. If the bottom is cooler move the target brick away from the burner. We
are talking inches here not great lengths. A move of an inch can even out
the kiln a great deal.
Our Bailey kilns were work horses that made us a living. The one kiln
fired over $700,000 worth of pottery. I bought it for $4500 Cdn and just
sold it for $1500. can't say it owed us much.
they are good kilns that can fire nice pots if they are nice going in, they
will be nice coming out.
Cheers,
tony
Clennell
4545 King Street RR# 1
Beamsville, Ontario Canada L0R 1B0
phone (905) 563-9382
fax (905) 563-9382
e mail clennell@bestnet.org
hasebe on sat 19 dec 98
Hi, In addition to moving the target bricks, Mr. Ruth Ballou suggested me a whi
ago to use two pyrometers, one for top and one for bottom, to monitor the
temperature during the body reduction. During the body reduction, you move
around a damper slightly (1-2 mm, my case) to even the top and bottom by the end
of body reduction. Response of the temperature rise after moving the damper is
very noticeable once you find a correct position for the damper. I used to have
cone difference at the end of cone 10, now down to 1/2 cone or less. Thanks to M
Ballou.
Hodaka Hasebe
clennell wrote:
> ----------------------------Original message----------------------------
> >----------------------------Original message----------------------------
> >Anyone have any ideas about how to get a more even firiing in a gas,
> >downdraft, Bailey, car kiln. The kiln is rectangular in shape, lined with
> >fiberfax, has 3 shelves wide and 3 shelves deep. Two burners are in the back
> >and hit a target brick. This kiln is used in a college setting and is
> >outfitted with a digital thermostat and soaking mechinism. We fire up to con
> >10 and get cone 9 just going down at top while 10 is flat on bottom. Any
> >thoughts to help would be appreciated. Thanks
> >
> >John, Providence
> +
>
> Dear John: We have owned two Bailey kilns and usually fire them with less
> than a half a cone difference top to bottom. If the top is cool and the
> bottom hot move the target brick closer to the burner to direct the heat
> up. If the bottom is cooler move the target brick away from the burner. We
> are talking inches here not great lengths. A move of an inch can even out
> the kiln a great deal.
> Our Bailey kilns were work horses that made us a living. The one kiln
> fired over $700,000 worth of pottery. I bought it for $4500 Cdn and just
> sold it for $1500. can't say it owed us much.
> they are good kilns that can fire nice pots if they are nice going in, they
> will be nice coming out.
> Cheers,
> tony
>
> Clennell
> 4545 King Street RR# 1
> Beamsville, Ontario Canada L0R 1B0
> phone (905) 563-9382
> fax (905) 563-9382
> e mail clennell@bestnet.org
--
Hodaka Hasebe
hasebeh@eznet.net
Pittsford, NY
cyberscape on sun 20 dec 98
John,
If it is cooler in the top of your downdraft kiln than in the bottom,
just push in the damper a bit until the kiln stops climbing in the
bottom. Since heat rises, it will even out the top, giving you richer
glazes because they will soak slowly. It will probably give you a bit
richer reduction, too. I usually start to even out the kiln at around
cone 8 bending. By cone 9 down, the kiln is usually dead even and the
cone 10s fall together. This has been true in every kiln that I have
ever built and was true just this evening in the MFT that I fired at the
Armory Art Center. Just be a little patient after you make the damper
correction. It WILL slow down the firing, which I think is a good thing
for glaze development. Good luck.
Harvey Sadow
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