Joe at The Harrison Art Center on wed 5 feb 03
I am inerested in a formula to produce a "crank like" clay body. I
understand it is a highly groged body but just adding grog to a
existing clay body dose not give the results I see in photographs.
Also, is a crank body and a chamotte body the same or different? One
source I have found seems to imply that the "chamotte" is a form of
grog added to a body.
I have searched the archives for this information but not find an
answer.
I will appreciate any help with a crank body formula.
Kyle Carpenter on wed 5 feb 03
not sure i've ever heard of a "crank" clay body, but if you want a really
rough clay try adding crushed soft brick, granite, granular feldpar. just an
idea.
kyle
Hank Murrow on wed 5 feb 03
On Wednesday, February 5, 2003, at 11:38 AM, Joe at The Harrison Art
Center wrote:
> I am inerested in a formula to produce a "crank like" clay body. I
> understand it is a highly groged body but just adding grog to a
> existing clay body dose not give the results I see in photographs.
>
> Also, is a crank body and a chamotte body the same or different? One
> source I have found seems to imply that the "chamotte" is a form of
> grog added to a body.
Sorry Joe;
But chamotte as I have experienced it, is a scrap body. Scraps from all
the bodies in use in a studio are mixed together, sometimes with
selected glaze to form a new body. They ncan be quite beautiful, if
somewhat melty.
Best, Hank in Eugene
"Wally on wed 5 feb 03
Joe,
I've heard of "crank clay" before, in old UK clay
catalogues. "Crank" is basically "chamotte" (french word for "grog")
made out firebrick. Unfortunately, firebrick usually contains
lime, which can lead to "lime popping" if fired to high
temperatures. So it is mainly used for low-fire coarse sculpture
work.
Sorry, but I have no specific recipe.... But located a supplier in
UK who still sells crank clay in various mixtures :
www.valentineclays.co.uk
Maybe you could contact them for more details.
Wally.
In clayart@yahoogroups.com, Joe at The Harrison Art Center
wrote:
> I am inerested in a formula to produce a "crank like" clay body. I
> understand it is a highly groged body but just adding grog to a
> existing clay body dose not give the results I see in photographs.
>
> Also, is a crank body and a chamotte body the same or different?
One
> source I have found seems to imply that the "chamotte" is a form of
> grog added to a body.
>
> I have searched the archives for this information but not find an
> answer.
>
> I will appreciate any help with a crank body formula.
>
>
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Marcia Selsor on wed 5 feb 03
I don't know what a crack body is but i have worked with chamotte clay
bodies in latvia and Uzbekistan. It has grog up to 1/4" chunks and is
fired to ^12. It is used or was by artists in the Soviet Artists Union
for large pieces such as Murals at the Opera House or Subway stations.
It fires white.
Marcia Selsor
Montana
Joe at The Harrison Art Center wrote:
> I am inerested in a formula to produce a "crank like" clay body. I
> understand it is a highly groged body but just adding grog to a
> existing clay body dose not give the results I see in photographs.
>
> Also, is a crank body and a chamotte body the same or different? One
> source I have found seems to imply that the "chamotte" is a form of
> grog added to a body.
>
> I have searched the archives for this information but not find an
> answer.
>
> I will appreciate any help with a crank body formula.
>
> ______________________________________________________________________________
> 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.
>
--
Tuscany in 2003
http://home.attbi.com/~m.selsor/Tuscany2003.html
Jenny Lewis on thu 6 feb 03
Greetings all
Crank clay is wonderful stuff to handbuild by coil, slab, whatever, and
great for Raku. It is a light stoneware with little groggy bits, and I
was told sometime in the dim distant part that the groggy bits were
molochite ground to about 80s, but my memory could be playing tricks
here. It has a nice crunchy texturey feel, and if you smooth it down
when leatherhard with a surform it gives a good rough surface, looks a
bit like very coarse sandpaper. If you sponge it down instead, even
crunchier.
I have tried to throw with it. Ouch. Some people manage, but when I
tried I nearly lost my fingerprints, so decided to stick to big coiled
fatbelly pots instead.
Jenny Lewis
in London UK
starting to think about the next
fatbelly coil pot
--
Pat Southwood on thu 6 feb 03
Jenny mentioned about throwing with crank, try wearing a pair of marigolds,
it looks daft and you need more lubrication because they "catch" but it
means you can throw lots of pots for raku really quickly. The advantage is
that when you take the gloves off and go back to your ordinary throwing clay
you suddenly are throwing much thinner than you were before, its a good
lesson in sensitivity.
Pat.
Diane Winters on thu 6 feb 03
Hi Pat,
Regarding throwing with crank, you said "try wearing a pair of marigolds,
>it looks daft..."
Well, those of us in the US are going to have some very daft images of this
indeed, as here "marigolds" exist only (as far as I know) as smallish, very
brightly colored orange or yellow flowers. I envisioned shredded petals
flying in all directions, torn to smithereens by the spinning rough groggy
clay.
I gather from the rest of your post that they are some sort of gloves.
Yellow-orange?
Diane in Oakland/Berkeley by the Bay
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