Tony Ferguson on wed 22 may 02
High clay is all about shrinking with the pot. Take a glaze like a shino
and covert kaolin to ball clay. Now, make another glaze and take all the
ball clay in it and convert it to kaolin. Fire these side by side on the
same form, like a bowl. You will see a difference in how the glaze shrinks
with the pot. If you look at something like Rhodes crackle slip, it has
calcined kaolin (which shrinks even less) in it--that baby aint shrinking
with the pot--that is why it lifts off the pot and you get a crackle
texture. I know a potter in Canada, Fritz L. who has not clay in his glazes
and he single fires--SO, clay is not always necessary. You may want to
glaze leather hard with a single fire glaze as well. Good skill'in to you.
Thank you.
Tony Ferguson
Stoneware, Porcelain, Raku
www.aquariusartgallery.com
218-727-6339
315 N. Lake Ave
Apt 312
Duluth, MN 55806
----- Original Message -----
From: "Donald G. Goldsobel"
To:
Sent: Wednesday, May 22, 2002 4:31 PM
Subject: Re: homebuilt kiln
> The high cay content is for fit. If there is at least 10 per cent clay in
> the glaze, the single fire techique should work.
>
> Donald
> ----- Original Message -----
> From: "don hunt"
> To:
> Sent: Wednesday, May 22, 2002 8:30 AM
> Subject: homebuilt kiln
>
>
> > Thanks for the suggestions to fix my stalling fiber downdraft. It
> > appears after one firing to pull smoothly through the 2000 f mark. I
> > lengthened the chimney by 2 feet to a total of about 6 feet from the
> > bottom of the damper box. My firing was uneven though, because the
> > pyrometer indicated about 2200 when the top 11 dropped. When do you
> > start cone watching? I guess I will begin to do it earlier.
> > Does anyone know how to calibrate a digital pyrometer? Since the K
> > probe is a standard, the resistance must be a known value, at say 2300
> > f. I would hope theres an adjustment inside to calibrate at a given
> > resistance. Ah, for a perfect world.
> > Is the reason for high clay content in single fire glazes to keep the
> > glaze from jumping off the pot and making me clean kiln shelves? I also
> > notice the glaze is very fragile especially on rims. I think I'm going
> > back to bisque more.
> >
> > Thanks
> > Don Hunt
> >
> >
>
____________________________________________________________________________
> __
> > Send postings to clayart@lsv.ceramics.org
> >
> > You may look at the archives for the list or change your subscription
> > settings from http://www.ceramics.org/clayart/
> >
> > Moderator of the list is Mel Jacobson who may be reached at
> melpots@pclink.com.
> >
>
>
____________________________________________________________________________
__
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
>
don hunt on wed 22 may 02
Thanks for the suggestions to fix my stalling fiber downdraft. It
appears after one firing to pull smoothly through the 2000 f mark. I
lengthened the chimney by 2 feet to a total of about 6 feet from the
bottom of the damper box. My firing was uneven though, because the
pyrometer indicated about 2200 when the top 11 dropped. When do you
start cone watching? I guess I will begin to do it earlier.
Does anyone know how to calibrate a digital pyrometer? Since the K
probe is a standard, the resistance must be a known value, at say 2300
f. I would hope theres an adjustment inside to calibrate at a given
resistance. Ah, for a perfect world.
Is the reason for high clay content in single fire glazes to keep the
glaze from jumping off the pot and making me clean kiln shelves? I also
notice the glaze is very fragile especially on rims. I think I'm going
back to bisque more.
Thanks
Don Hunt
Donald G. Goldsobel on wed 22 may 02
The high cay content is for fit. If there is at least 10 per cent clay in
the glaze, the single fire techique should work.
Donald
----- Original Message -----
From: "don hunt"
To:
Sent: Wednesday, May 22, 2002 8:30 AM
Subject: homebuilt kiln
> Thanks for the suggestions to fix my stalling fiber downdraft. It
> appears after one firing to pull smoothly through the 2000 f mark. I
> lengthened the chimney by 2 feet to a total of about 6 feet from the
> bottom of the damper box. My firing was uneven though, because the
> pyrometer indicated about 2200 when the top 11 dropped. When do you
> start cone watching? I guess I will begin to do it earlier.
> Does anyone know how to calibrate a digital pyrometer? Since the K
> probe is a standard, the resistance must be a known value, at say 2300
> f. I would hope theres an adjustment inside to calibrate at a given
> resistance. Ah, for a perfect world.
> Is the reason for high clay content in single fire glazes to keep the
> glaze from jumping off the pot and making me clean kiln shelves? I also
> notice the glaze is very fragile especially on rims. I think I'm going
> back to bisque more.
>
> Thanks
> Don Hunt
>
>
____________________________________________________________________________
__
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
>
| |
|
