Laurence Lavagne on tue 12 sep 06
bonjour,right now I am making plates with slabs over a bisque mold using a
white low fire clay with no grog, I get often a wraping problem,it shows
sometimes after the piece is dry or after the bisque firing (cone 04). Is
anyone as some suggestions about how to dry the plates how to load them in
the kiln (upside down?)and should I use a finely grog clay to help? merci
for your answers.
laurence
Charan Sachar on tue 12 sep 06
I make thrown as well as slab plates from Clay art center's (Tacoma, WA)
clay body Newcomb cone 6 (has some sand/grog). The thrown plates are on
Hydrobats, so I let them dry very slowly covered and trim them when
dry/leather hard.
The slab plates I make in bisqued molds like you described and leave them
in the mold for a day before removing them. This way I have seen there is
less warping. Once the plates are trimed/cleanedup, I lay them on drywall
board and leave them alone. Less handling of plates is a key!
I bisque when the plates are completly dry. One suggestion from clayart is
to bisque on rims. When I bisque, I learnt something. The thrown plates I
can bisque laying on their rims supported by kiln furniture or other
pieces. This way I can fit several. But the slab built plates always warp
if supported on the rim. The slab plates get bisqued laying flat right
side up, stacked just 2 (ok.. sometimes 3). Have had no problems.
Hope this helps.
Charan
Lynne Antone on tue 12 sep 06
Laurence,
Check the subscription site for all the rules for Clayart (I think that's where it's at). Look for the Digest feature where you get only one message with all the posts for that day included in it. I think it's too cumbersome and like just deleting all the messages that I don't want, then read the rest. Remember that if you delete something from Clayart that you wished you had read, you can go to the Archives and see all the posts you want.
Look at the end of this post to see the addresses for Archives and joining/using information. If the instructions are not there, let me know and I will send you a copy of the rules. The moderator sends them out every so often and I save the latest one.
Lynne Antone
--
"Some mistakes are too much fun to make only once"
Beaver Creek Arts
Olympia WA
USA
-------------- Original message ----------------------
From: Laurence Lavagne
> bonjour,right now I am making plates with slabs over a bisque mold using a
> white low fire clay with no grog, I get often a wraping problem,it shows
> sometimes after the piece is dry or after the bisque firing (cone 04). Is
> anyone as some suggestions about how to dry the plates how to load them in
> the kiln (upside down?)and should I use a finely grog clay to help? merci
> for your answers.
> laurence
>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
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> You may look at the archives for the list or change your subscription
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> Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
Barbara Lewis on tue 12 sep 06
Laurence: A couple of things occur to me. Your clay slab may be too thin.
When you lay the slab on the mold, use a rib to compress the clay and to
build in memory. Control the drying process (no drafts or uneven drying).
A little grog added to the claybody wouldn't hurt. Barbara
----- Original Message -----
From: "Laurence Lavagne"
To:
Sent: Tuesday, September 12, 2006 9:58 AM
Subject: warping plates
> bonjour,right now I am making plates with slabs over a bisque mold using a
> white low fire clay with no grog, I get often a wraping problem,it shows
> sometimes after the piece is dry or after the bisque firing (cone 04). Is
> anyone as some suggestions about how to dry the plates how to load them in
> the kiln (upside down?)and should I use a finely grog clay to help? merci
> for your answers.
> laurence
>
> ______________________________________________________________________________
> 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.
>
Alistair Gillies on tue 12 sep 06
If you want to stay with the same clay try stacking the plates rim to rim,
Alistair
Ironbridge Gorge, England
From: "Laurence Lavagne"
> bonjour,right now I am making plates with slabs over a bisque mold using a
> white low fire clay with no grog, I get often a wraping problem,it shows
> sometimes after the piece is dry or after the bisque firing (cone 04). Is
> anyone as some suggestions about how to dry the plates how to load them in
> the kiln (upside down?)and should I use a finely grog clay to help? merci
> for your answers.
> laurence
Charlie Cummings on tue 12 sep 06
Laurence,
I've found that in my situation warping in slab-moulded plates comes
from memory introduced into the slab before it is placed on the mold.
I use a squeegee to remove the canvas texture from both sides of the
slab before I put it in the mold. In order to keep the slab flat
while I am turning it over, I slide the canvas and clay onto a piece
of plywood. I place canvas and then plywood on top to make a
sandwich. I grasp the whole pile and flip it over.
After smoothing the exposed side, I place the mold on the clay and
cut the extra clay off. Next I flip the mold-clay-canvas-plywood
sandwich over to put the clay into the mold. I usually let the
plates dry uncovered until they are very stiff leather hard. Taking
them out of the mold while they are still plastic can lead to warping.
My students make hundreds of slab plates a year. They almost never
warp unless they picked the slab up and bent it before putting it in
the mold. The clay is not bent while it is a slab, so no memory is
introduced into the clay. No memory = no warping.
Addition of grog to your clay will help minimize warping, but it may
also raise the porosity of the clay. Take a look at your forming
technique first. Are you doing things that introduce memory into the clay?
Charlie
At 09:58 AM 9/12/2006, you wrote:
>bonjour,right now I am making plates with slabs over a bisque mold using a
>white low fire clay with no grog, I get often a wraping problem,it shows
>sometimes after the piece is dry or after the bisque firing (cone 04). Is
>anyone as some suggestions about how to dry the plates how to load them in
>the kiln (upside down?)and should I use a finely grog clay to help? merci
>for your answers.
> laurence
Charlie Cummings Clay Studio & Gallery
4130 South Clinton Street
Fort Wayne, IN 46806
Charlie@claylink.com
260-458-9160
www.claylink.com
Flo Fahrenheit on sat 25 feb 12
Thanks to everyone who responded to my warping plate problem. I know it =3D
takes precious time to respond and I am grateful. Anyone who wants a =3D
compilation of all the solutions I received, email me direct and I'll =3D
send you a file.
Flo Fahrenheit
Grass Valley, CA=3D
John Britt on sun 26 feb 12
Here you go:
http://www.amazon.com/Canon-PowerShot-ELPH-300-
HS/dp/B004J41T7Q/ref=3D3Dsr_1_1?ie=3D3DUTF8&qid=3D3D1330210033&sr=3D3D8-1=
=3D
http://www.youtube.com/user/johnbrittpottery?feature=3D3Dmhee
johnbrittpottery.com
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