Roxanne Hunnicutt on wed 28 apr 10
Oh yes! DO stretch something over a tube
To: aaron
My favs: Using a stretchy fabric like polyester over a garbage can with a
lip. Then you put something stretchy under the lip and over the fabric! Lik=
e
a rubber band or a rope or a bungy!?
THAT MAKES LOVELY BOWLS. Droop 'em as much as your fabric will do!
AND NO PLASTER MOLD NEEDED! I think you are making your molds thinner than
most of us do! We make deep and thick ones!
Rox in OR
--
Montaigne:"All I say is by way of discourse, and nothing by way of advice.
I should not speak so boldly if it were my due to be believed."
aaron cortelyou on wed 28 apr 10
I have been making a lot of thin porcelain slabs and have been using
shallow concave slump molds made out of low fired stone ware. I've
been spending the day thinking about better ways to do this since I'm
limited to the size of the mold. I could make larger slump molds but
they're fragile and difficult to make larger than 2 ft by 2ft. I don't
want to do it in plaster since I'll break that in a matter of weeks
and it will begin to crack on it's own in a year or so. I'm wondering
if anybody has used stretched canvas over a hollow frame (like for a
canvas painting) to lay their slabs on to form a gentle curve? This,
like plaster would help dry both sides evenly. Has anybody tried this;
do you think it will work?
Thanks,
Aaron
Lis Allison on wed 28 apr 10
On Wednesday 28 April 2010, you wrote:
> I have been making a lot of thin porcelain slabs and have been using
> shallow concave slump molds made out of low fired stone ware. I've
> been spending the day thinking about better ways to do this since I'm
> limited to the size of the mold. I could make larger slump molds but
> they're fragile and difficult to make larger than 2 ft by 2ft. I don't
> want to do it in plaster since I'll break that in a matter of weeks
> and it will begin to crack on it's own in a year or so. I'm wondering
> if anybody has used stretched canvas over a hollow frame (like for a
> canvas painting) to lay their slabs on to form a gentle curve? This,
> like plaster would help dry both sides evenly. Has anybody tried this;
> do you think it will work?
I did something like that with cotton (old sheet) stretched on, well,
stretchers. (Those are the thingies painters stretch the canvas on. Sorry
to those who already know that.) It wasn't as big as what you are talking
about, only 18" square, but it worked fine. The only problem I had was
that one of the slabs flattened out in the final firing and created one of
those nice clay/kiln shelf sculptures.
So make sure the canvas can sag enough to give you enough 'lift' for the
sides so that doesn't happen or don't glaze the bottom or something.
Why do you say plaster molds will crack? I have some 20 years old and
still fine.
Lis
--
Elisabeth Allison
Pine Ridge Studio
www.Pine-Ridge-Studio.blogspot.com
aaron cortelyou on wed 28 apr 10
Thanks, I fortunately don't need to worry about canvas texture since
these platters are for wall hanging and the bottoms will be up against
the wall. I'll remember your advice if I need to reduce the texture in
the future. I made a mock-up out of the slats for a pour mold just
clamping the canvas into place. I'll go to a sail canvas shop tomorrow
and get brass brackets that I just loop over pegs I'll place on the
frame.
I love this board and really appreciate your help and all the help
I've gotten over the past 6 months since I joined.
Aaron
On Wed, Apr 28, 2010 at 3:05 PM, L TURNER wro=
=3D
te:
> Yes, I works. =3DA0I have used it often to make plates. =3DA0You have to =
be
> selective with the material since there is a possibility that the
> texture of the "canvas" will show up in the the clay, especially if
> you use very wet clay. =3DA0I avoided this by using a tightly woven
> bedsheet instead of canvas. =3DA0Also placing tissue paper over the weave
> helps as well.
>>
>
Snail Scott on wed 28 apr 10
On Apr 28, 2010, at 3:26 PM, aaron cortelyou wrote:
> ...I'm wondering
> if anybody has used stretched canvas over a hollow frame (like for a
> canvas painting) to lay their slabs on to form a gentle curve?
You betcha! It works just fine, and you can
unfasten the canvas to adjust the curvature
from one project to the next.
-Snail
aaron cortelyou on wed 28 apr 10
Thanks again, and to Lis Allison, I cut up about 15 soft kiln bricks
into small wedge shapes that I slide under the side of the slabs so
they will prop it up when it starts to sag. I assume most people will
be glazing the underside but if you aren't this method works great and
prevents cracking of large, shallow bowl shapes.
On Wed, Apr 28, 2010 at 3:26 PM, Snail Scott wr=
=3D
ote:
> On Apr 28, 2010, at 3:26 PM, aaron cortelyou wrote:
>>
>> ...I'm wondering
>> if anybody has used stretched canvas over a hollow frame (like for a
>> canvas painting) to lay their slabs on to form a gentle curve?
>
>
> You betcha! It works just fine, and you can
> unfasten the canvas to adjust the curvature
> from one project to the next.
>
> =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =
=3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3D
=3DA0-Snail
>
Eva Gallagher on wed 28 apr 10
Hi Aaron,
I use the top of a garbage can - tie/tape on a piece of cloth on it. The
tightness of the cloth depends on how deep you want to slump. So far I have
only used non-stretchy cloth but a tight fit of stretchy cloth would give
great results as well. I roll out the slab, cut out the shape that I wnat -
in my case a circle and then invert it onto another cloth. Then two people
are needed to lift this cloth and place it onto the garbage can cloth. This
way the slab does not get disturbed too much when trasferring. To get a mor=
e
retangular slump mould I plan to suspend some cloth in a hammock type of
arrangement - but haven't actually tried this yet.
Hope this makes sense.
Eva Gallagher
http://newfoundoutpotter.blogspot.com/
http://www.valleyartisans.com/gallagher/Gallagher.htm
----- Original Message -----
From: "aaron cortelyou"
To:
Sent: Wednesday, April 28, 2010 4:26 PM
Subject: Stretched canvas slump mold?
>I have been making a lot of thin porcelain slabs and have been using
> shallow concave slump molds made out of low fired stone ware. I've
> been spending the day thinking about better ways to do this since I'm
> limited to the size of the mold. I could make larger slump molds but
> they're fragile and difficult to make larger than 2 ft by 2ft. I don't
> want to do it in plaster since I'll break that in a matter of weeks
> and it will begin to crack on it's own in a year or so. I'm wondering
> if anybody has used stretched canvas over a hollow frame (like for a
> canvas painting) to lay their slabs on to form a gentle curve? This,
> like plaster would help dry both sides evenly. Has anybody tried this;
> do you think it will work?
>
> Thanks,
>
> Aaron
>
>
Lee Love on wed 28 apr 10
My friend in Arizona, David McDonald, makes platters over two feet
wide using this stretched canvas technique. Take a look here:
http://limberlostpottery.com/MyCeramicArtwork/2004.htm
--
Lee, a Mashiko potter in Minneapolis
http://mashikopots.blogspot.com/
=3D93Observe the wonders as they occur around you. Don't claim them. Feel
the artistry moving through and be silent.=3D94 --Rumi
Steve Mills on thu 29 apr 10
Aaron,
I've used this system a lot in the past and occasionally now. My usual
technique is to stretch or sling the canvas over the feet of an up-side-dow=
n
wooden stool. Nice and simple, and it goes back to being a stool when you'v=
e
finished!
Among the advantages for me are;
you can vary the tension of the canvas at will to alter the shape, more eve=
n
drying of the piece, roll the canvas up when not in use, and yet another wa=
y
to avoid having plaster and its associated problems in the workshop!
Steve M
On 28 April 2010 21:26, aaron cortelyou wrote:
> I have been making a lot of thin porcelain slabs and have been using
> shallow concave slump molds made out of low fired stone ware. I've
> been spending the day thinking about better ways to do this since I'm
> limited to the size of the mold. I could make larger slump molds but
> they're fragile and difficult to make larger than 2 ft by 2ft. I don't
> want to do it in plaster since I'll break that in a matter of weeks
> and it will begin to crack on it's own in a year or so. I'm wondering
> if anybody has used stretched canvas over a hollow frame (like for a
> canvas painting) to lay their slabs on to form a gentle curve? This,
> like plaster would help dry both sides evenly. Has anybody tried this;
> do you think it will work?
>
> Thanks,
>
> Aaron
>
--
Steve
Bath
UK
www.mudslinger.me.uk
Growing old is inevitable, growing up is optional!
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