MJ on tue 13 apr 10
Hello - I am a novice potter with my first kiln. My kiln is 28 inches wide
by 18 inches tall. I have the corelite shelves. I do large platters so i
bought some full round shelves. I know you are supposed to 3 post the
shelves, but I am confused as to how you do that if you want to have a half
shelf above the full shelf. I had been told to 4 post, but now I have
having difficulty as the bottom of the kiln is not perfectly flat. It is a=
n
electric kiln. Should I make wads to help level the shelves? If so, what
would you suggest as the material for the wad. Any help is appreciated.
Thx, MJ
MJ on tue 13 apr 10
There is a small hairline crack in the bottom and the area behind the crack
must be a bit lower. There is not much difference, but there is a slight
wabble. I am told hairline cracks like these in the bottom are common. I
know you are supposed to 3 post and that would eliminate the wobble, but I
don't understand how I would put half shelves on top of full shelves if I
did that. Any help is appreciated.
On Tue, Apr 13, 2010 at 9:50 AM, Nancy Spinella wrote:
> I'm a little confused -- why is the bottom of the kiln not perfectly flat=
?
>
>
>
> On Tue, Apr 13, 2010 at 12:20 PM, MJ wrote:
>
>> Hello - I am a novice potter with my first kiln. My kiln is 28 inches
>> wide
>> by 18 inches tall. I have the corelite shelves. I do large platters so=
i
>> bought some full round shelves. I know you are supposed to 3 post the
>> shelves, but I am confused as to how you do that if you want to have a
>> half
>> shelf above the full shelf. I had been told to 4 post, but now I have
>> having difficulty as the bottom of the kiln is not perfectly flat. It i=
s
>> an
>> electric kiln. Should I make wads to help level the shelves? If so, wh=
at
>> would you suggest as the material for the wad. Any help is appreciated.
>> Thx, MJ
>>
>
>
Nancy Spinella on tue 13 apr 10
I'm a little confused -- why is the bottom of the kiln not perfectly flat?
On Tue, Apr 13, 2010 at 12:20 PM, MJ wrote:
> Hello - I am a novice potter with my first kiln. My kiln is 28 inches wi=
de
> by 18 inches tall. I have the corelite shelves. I do large platters so =
i
> bought some full round shelves. I know you are supposed to 3 post the
> shelves, but I am confused as to how you do that if you want to have a ha=
lf
> shelf above the full shelf. I had been told to 4 post, but now I have
> having difficulty as the bottom of the kiln is not perfectly flat. It is
> an
> electric kiln. Should I make wads to help level the shelves? If so, wha=
t
> would you suggest as the material for the wad. Any help is appreciated.
> Thx, MJ
>
William & Susan Schran User on tue 13 apr 10
On 4/13/10 12:20 PM, "MJ" wrote:
> Hello - I am a novice potter with my first kiln. My kiln is 28 inches wi=
de
> by 18 inches tall. I have the corelite shelves. I do large platters so =
i
> bought some full round shelves. I know you are supposed to 3 post the
> shelves, but I am confused as to how you do that if you want to have a ha=
lf
> shelf above the full shelf. I had been told to 4 post, but now I have
> having difficulty as the bottom of the kiln is not perfectly flat. It is=
an
> electric kiln. Should I make wads to help level the shelves? If so, wha=
t
> would you suggest as the material for the wad. Any help is appreciated.
> Thx, MJ
What about the bottom is not flat?
Yes, you can add some wadding to a post to level things out.
4 posts between floor and shelf equally spaced around, then 3 posts for hal=
f
shelves can share/be directly above 3 of the post positions below.
I've been using pieces of broken 3/4" shelf as the beginning posts.
Bill
--
William "Bill" Schran
wschran@cox.net
wschran@nvcc.edu
http://www.creativecreekartisans.com
Lis Allison on tue 13 apr 10
On Tuesday 13 April 2010, you wrote:
> Hello - I am a novice potter with my first kiln. My kiln is 28 inches
> wide by 18 inches tall. I have the corelite shelves. I do large
> platters so i bought some full round shelves. I know you are supposed
> to 3 post the shelves, but I am confused as to how you do that if you
> want to have a half shelf above the full shelf. I had been told to 4
> post, but now I have having difficulty as the bottom of the kiln is
> not perfectly flat. It is an electric kiln. Should I make wads to
> help level the shelves? If so, what would you suggest as the material
> for the wad. Any help is appreciated. Thx, MJ
>
That is where broken shelves come in really handy! Just smash one to make
small pieces and use them under the posts to bring them to the exact
height as the ones on the extra shelf. Some pottery suppliers also do sell
a small square kiln post the thickness of a shelf.
Lis
--
Elisabeth Allison
Pine Ridge Studio
www.Pine-Ridge-Studio.blogspot.com
Snail Scott on wed 14 apr 10
On Apr 13, 2010, at 11:20 AM, MJ wrote:
> ...I know you are supposed to 3 post the
> shelves, but I am confused as to how you do that if you want to have
> a half
> shelf above the full shelf. I had been told to 4 post, but now I have
> having difficulty as the bottom of the kiln is not perfectly flat...
Yes, it's nearly impossible to get even support
from four posts. One will always be shy of the
shelf, at least by a little. Wadding is indeed the
way to go to prevent warping of that shelf. I use
kiln putty myself (just thickened kiln wash), but
there are may alternatives. Kiln putty is simply
convenient, since I can just scrape the thickened
glop from the sides of my kiln wash bin and pat
it into shape.
-Snail
Ric Swenson on wed 14 apr 10
kiln bottoms vary...use a level....control it....not difficult...use wads..=
.or what ever you need...
ric
"...then fiery expedition be my wing, ..."
-Wm. Shakespeare, RICHARD III, Act IV Scene III
Richard H. ("Ric") Swenson, Teacher,
Office of International Cooperation and Exchange of Jingdezhen Ceramic Inst=
itute,
TaoYang Road, Eastern Suburb, Jingdezhen City.
JiangXi Province, P.R. of China.
Postal code 333001.
Mobile/cellular phone : 86 13767818872
< RicSwenson0823@hotmail.com>
http://www.jci.jx.cn
> Date: Tue, 13 Apr 2010 12:50:18 -0400
> From: rubian77@GMAIL.COM
> Subject: Re: kiln post question
> To: Clayart@LSV.CERAMICS.ORG
>
> I'm a little confused -- why is the bottom of the kiln not perfectly flat=
?
>
>
> On Tue, Apr 13, 2010 at 12:20 PM, MJ wrote:
>
> > Hello - I am a novice potter with my first kiln. My kiln is 28 inches w=
ide
> > by 18 inches tall. I have the corelite shelves. I do large platters so =
i
> > bought some full round shelves. I know you are supposed to 3 post the
> > shelves, but I am confused as to how you do that if you want to have a =
half
> > shelf above the full shelf. I had been told to 4 post, but now I have
> > having difficulty as the bottom of the kiln is not perfectly flat. It i=
s
> > an
> > electric kiln. Should I make wads to help level the shelves? If so, wha=
t
> > would you suggest as the material for the wad. Any help is appreciated.
> > Thx, MJ
> >
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James Freeman on wed 14 apr 10
MJ...
Unless I misinterpreted your question, here is a bit of information
that I think you are looking for. This is just what I do, and you may
get other, better, answers.
When I have to eliminate a slight wobble or out of level condition in
a kiln shelf (for whatever reason), I usually just grab a bit of
whatever stoneware clay is handy, put a small lump of it on the short
post or posts, then just set the shelf and push it down until level.
At cone 6 and below, the stoneware wad has never stuck to the post or
shelf. Sometimes it will at cone 10, but it cones off easily with a
hammer tap on a scraper.
Wadding would probably be better, and when it is handy, for instance
when left over from loading the salt or wood kiln, then I use that.
An easy recipe is one part by volume coarse clay (I usually use Gold
Art or Hawthorn Bond) one part silica, and one part alumina. Mix to a
slip, then mix in dry sawdust to absorb the excess mixing water until
the wadding thickens to the consistency of clay.
For the salt kiln, I leave out the silica. Lately, for salt and wood
I have been using two parts alumina. It increases the cost a tiny
bit, but the wads separate from the fired work much easier and
cleaner. For an electric kiln, I would probably leave out the sawdust
and just thicken the slip on a plaster slab.
If I am using full round shelves all the way up (something not
recommended by Orton, but often necessary or desirable), I use three
posts per level. If a full round shelf will have a half-round atop
it, I usually use four posts under the round shelf, then three posts
set above three of the four to support the half-round shelf. If I am
setting a quarter-round shelf at the top, I don't even worry about
where the posts go, as there won't be enough weight to cause any
problems. My own full round shelves are monsters, 1 1/8" thick, so I
can really put an unsupported post anywhere without any problem, but I
wouldn't so this with a shelf of ordinary thickness. I also don't
recommend such massively thick shelves for a number of reasons, but I
got a deal on 11 of them that I couldn't refuse.
Did this answer your questions?
...James
James Freeman
"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."
-Michel de Montaigne
http://www.jamesfreemanstudio.com
http://www.flickr.com/photos/jamesfreemanstudio/
http://www.jamesfreemanstudio.com/resources
On Tue, Apr 13, 2010 at 12:53 PM, MJ wrote:
> There is a small hairline crack in the bottom and the area behind the cra=
=3D
ck
> must be a bit lower. =3DA0There is not much difference, but there is a sl=
ig=3D
ht
> wabble. =3DA0I am told hairline cracks like these in the bottom are commo=
n.=3D
=3DA0I
> know you are supposed to 3 post and that would eliminate the wobble, but =
=3D
I
> don't understand how I would put half shelves on top of full shelves if I
> did that. =3DA0Any help is appreciated.
>
> On Tue, Apr 13, 2010 at 9:50 AM, Nancy Spinella wrot=
=3D
e:
>
>> I'm a little confused -- why is the bottom of the kiln not perfectly fla=
=3D
t?
>>
>>
>>
>> On Tue, Apr 13, 2010 at 12:20 PM, MJ wrote:
>>
>>> Hello - I am a novice potter with my first kiln. =3DA0My kiln is 28 inc=
he=3D
s
>>> wide
>>> by 18 inches tall. =3DA0I have the corelite shelves. =3DA0I do large pl=
atte=3D
rs so i
>>> bought some full round shelves. =3DA0I know you are supposed to 3 post =
th=3D
e
>>> shelves, but I am confused as to how you do that if you want to have a
>>> half
>>> shelf above the full shelf. =3DA0I had been told to 4 post, but now I h=
av=3D
e
>>> having difficulty as the bottom of the kiln is not perfectly flat. =3DA=
0I=3D
t is
>>> an
>>> electric kiln. =3DA0Should I make wads to help level the shelves? =3DA0=
If s=3D
o, what
>>> would you suggest as the material for the wad. =3DA0Any help is appreci=
at=3D
ed.
>>> Thx, MJ
>>>
>>
>>
>
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