MERKLEYS on thu 21 jan 99
The best way in my opinion,for getting air out of clay is to cut it with
a wire smack one half down on your work table with force,smack the other
on top, continue until both halfs are uniform in texture,grog helps big
time,spiral wedging,ox head wedging or praying to your kiln god in my
opinion dosnt do much of any thing,i think clay will align ifself
through the act of centering compressing and pulling
Kathi LeSueur on fri 22 jan 99
I've never believed (well, not since I've been doing this for a living) that
air bubbles cause clay to explode. I've had bubbles in pieces frequently with
out them blowing up. I've also made forms that were completely closed that
didn't blow.
But, I do blow things that are not thoroughly dry. It always ------ me off. It
happens when I'm rushing. And it's usually knobs on casseroles or very big
pots.
Always dry things longer than you think necessary.
Kathi
Earl Brunner on sun 24 jan 99
I would agree in principle with Kathi here, I don't think I have ever blown
something up that I have thrown with an air bubble in it. The jury is still out
on the handles or knobs, I'm not sure that some of the problems that I've
had in the past weren't related to trapped air, especially with thrown on
knobs. Every pot I've blown has been because of moisture and I've blown
some BIG ones. I even blew a 30 inch by 30 inch planter up in a glaze fire
after it had made it through the bisque OK. *&#$%@# me off! Didn't
give the glaze time to dry out. Hurrying has killed more of my best pots
then I care to think about.
Earl Brunner
Kathi LeSueur wrote:
> ----------------------------Original message----------------------------
> I've never believed (well, not since I've been doing this for a living) that
> air bubbles cause clay to explode. I've had bubbles in pieces frequently with
> out them blowing up. I've also made forms that were completely closed that
> didn't blow.
>
> But, I do blow things that are not thoroughly dry. It always ------ me off. It
> happens when I'm rushing. And it's usually knobs on casseroles or very big
> pots.
>
> Always dry things longer than you think necessary.
>
> Kathi
Cheryl L Litman on sun 24 jan 99
I fired several kiln loads of peices with multiple compartments - lots of
trapped air. They were well dried before starting and I did a very slow
bisque after an overnight candling. I also slowed the glaze firing. No
cracking, no explosions. I did this with both a very open raku clay and
Standard's 266 stoneware and #245 white stoneware.
Cheryl Litman
Somerset, NJ
email: cheryllitman@juno.com
On Fri, 22 Jan 1999 07:39:30 EST Kathi LeSueur writes:
>----------------------------Original
>message----------------------------
>I've never believed (well, not since I've been doing this for a
>living) that
>air bubbles cause clay to explode. I've had bubbles in pieces
>frequently with
>out them blowing up. I've also made forms that were completely closed
>that
>didn't blow.
>
>But, I do blow things that are not thoroughly dry. It always ------ me
>off. It
>happens when I'm rushing. And it's usually knobs on casseroles or very
>big
>pots.
>
>Always dry things longer than you think necessary.
>
>Kathi
>
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Russel Fouts on mon 25 jan 99
I've been firing a lot of really heavy, large, SOLID pieces lately and if
you make sure their REALLY dry and fire REALLY slow they'll come out.
To make sure they're really dry, they live on top of the kiln for a while.
If you take it slowly and hold for a long time (overnight) at 100c all the
water smoking should be done by then, then you SHOULD be able to go at a
normal rate. I think there's a second stage where the chemical water is
burned off that you should also hold at but the technical references are
down stairs and my body is pretty open so I haven't had to worry too much
about this.
As for proceeding at a normal rate; when my kiln gets just over 600c the
controller kicks into full so I have no choice. "Ceramic Instruments" of
Brussels's idea of good controller design.
I also don't wedge and don't worry about air bubbles either.
Russel (All caught up on the ClayArt backlog, and living in "real time",
such as it is)
Russel Fouts
Mes Potes & Mes Pots
Brussels, Belgium
32 2 223 02 75
Http://users.skynet.be/russel.fouts
Http://www.japan-net.or.jp/~iwcat
Grant me the Senility to forget the people I never liked anyway,
The good fortune to run into the ones I do
And the eyesight to tell the difference.
John K. Dellow on mon 25 jan 99
Cheryl L Litman wrote:
> ----------------------------Original message----------------------------
> I fired several kiln loads of peices with multiple compartments - lots of
> trapped air. They were well dried before starting and I did a very slow
> bisque after an overnight candling. I also slowed the glaze firing. No
> cracking, no explosions. I did this with both a very open raku clay and
> Standard's 266 stoneware and #245 white stoneware.
My friend Geoff Walker nearly got thrown out of the potters society of
australia for this type of heresy. He made thrown eggs & did not put holes in
them . Bisqued & glazed no problems.--
John Dellow "the flower pot man"
ICQ : #2193986 {jacka}
E-mail : dellow@usa.net
25 Hugh Guinea Ct, Worongary Q 4213
Ph:+61-7-55302875 Fax:+61-7-55253585
Home Page : http://welcome.to/jkdellow
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