Mike Gordon on mon 26 apr 04
On Apr 26, 2004, at 8:09 AM, Joseph Coniglio wrote:
>
> 1) Fear the pots gonna blow up. How do I slow this bisque down
> especially since the gas comes up to temperature rather quickly??
>
Joe,
You don't give much info ... How long did you dry this pot? You can use
100 watt light bulbs to dry it from the inside, does this updraft have
a damper? Open it all the way with the burners as low as possible,
monitor the temp with a pyromater if it gets too hot too fast shut it
off and close the damper and let it sit for an hour or so, check for
moisture with a mirror, if it steams up there is still water in the
clay, go slow till you reach at least 1100 degrees, I hope this helps,
Mike Gordon
Joseph Coniglio on mon 26 apr 04
Scenerio:
Pot's way too large for the Skut 1027.
Will have to --bisque-- with a Propane updraft.
--This is a large terra cotta garden pot. Coiled with 1 in diameter coils
with a wicked 2 in rim. Pot stands over waist high.
Can't even tell if it's dry enough to bisque. This is way out of what I
figured were the normal conventions.
Worked on a slow dry. Let's say it's dry.
1) Fear the pots gonna blow up. How do I slow this bisque down
especially since the gas comes up to temperature rather quickly??
2) Would it pay to over grog the terra cotta body??
Thank you.
Joe
Hendrix, Taylor J. on mon 26 apr 04
Joe:
I'm not going to lie to you. I may not know what I am talking about.
Hehe.=20
But since I have been thinking about making terra cotta pots for a time
now, reading up on the subject, I may be able to make some suggestions.
If you are going to make nice monster pots like that and want them to
survive outdoors, it might be best to open the body with either grog
from the same clay body (pitchers) or sand. Grog from higher fired
bodies may cause problems after firing because the grog never gets
matured at TC temps. Absorption of the grog may then be a problem. Now
this is what I have read only, so be Ivoresque and skeptical. =20
As for slowing the bisque, that should be easy enough to slow down with
burner control, shouldn't it? A looooooooooong candleing? Those big
pots do take much longer to dry out and surface dryness can be
misleading for sure......boom. Hehe. Talkin' weeks. Man, I wish I
could throw me some big ol' pots, but I'm not crazy enough to have a one
pot load in my baby paragon. I'm jealous.
Vive la terra cotta!
Taylor
Waco, Texas, USA
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Joseph
Coniglio
Sent: Monday, April 26, 2004 10:09 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Bisquing Large / Large Coil Pots
...
Worked on a slow dry. Let's say it's dry.
1) Fear the pots gonna blow up. How do I slow this bisque down
especially since the gas comes up to temperature rather quickly??
2) Would it pay to over grog the terra cotta body??
...
Earl Brunner on mon 26 apr 04
At one point in my career I was into quite large pots, anywhere from 70-120
lbs a piece. The BIGGEST problem I had was stretching out the preheat and
firing slowly enough in the initial stages of the firing. I never really
got in the correct zone for that. I kept making them, but blew up FAR more
than survived. You have GOT to take the preheat SLOW and do 3 to 5 times as
long as you would for a conventional firing. I always got impatient.
Earl Brunner
Las Vegas, NV
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Joseph Coniglio
Sent: Monday, April 26, 2004 8:09 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Bisquing Large / Large Coil Pots
Scenerio:
Pot's way too large for the Skut 1027.
Will have to --bisque-- with a Propane updraft.
--This is a large terra cotta garden pot. Coiled with 1 in diameter coils
with a wicked 2 in rim. Pot stands over waist high.
Can't even tell if it's dry enough to bisque. This is way out of what I
figured were the normal conventions.
Worked on a slow dry. Let's say it's dry.
1) Fear the pots gonna blow up. How do I slow this bisque down
especially since the gas comes up to temperature rather quickly??
2) Would it pay to over grog the terra cotta body??
Thank you.
Joe
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Ron Roy on tue 27 apr 04
Hi Joe,
As long as you get all the resident water out it will be OK - just find a
way to warm the pot to make all the water of plasticity evaportate - maybe
just hang a light bulb in it till it feels warm to the touch - then one
more day.
RR
>Pot's way too large for the Skut 1027.
>
>Will have to --bisque-- with a Propane updraft.
>
>--This is a large terra cotta garden pot. Coiled with 1 in diameter coils
>with a wicked 2 in rim. Pot stands over waist high.
>
>Can't even tell if it's dry enough to bisque. This is way out of what I
>figured were the normal conventions.
>
>Worked on a slow dry. Let's say it's dry.
>
>1) Fear the pots gonna blow up. How do I slow this bisque down
>especially since the gas comes up to temperature rather quickly??
>
>2) Would it pay to over grog the terra cotta body??
>
>
>Thank you.
>Joe
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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