John Baisch on tue 20 may 97
I know this has been discussed before but I never got a good
last answer. I'm looking at building my own kiln
furniture for both high fire (Cone 10-11) and Salt.
Any good recipes would be greatly appreciated..
JB
David Hendley on wed 21 may 97
I'm looking at building my own kiln
>furniture for both high fire (Cone 10-11) and Salt.
> John - I make all my own kiln posts and they are very durable. The
"recipe", if you can call it that is firclay, enough ball clay so it will
extrude decently, and about 30% or more, if you can get away with it,
crushed insulating fire bricks, 30 mesh and smaller.
I fire with wood, so right after extruding I roll the posts in
hydrated alumina, a good thick coat, embedded right in the clay, to resist
ash build-up, and that is why they are more durable than commercially bought
ones! This would be an even greater benefit with salt.
I have not had good luck trying to make kiln shelves. I made 28"
half rounds for my electric bisque firings out of the same body, but they
cracked after just a few firings, going only to ^06.
If you have access to "ancient" Ceramics Monthly's, Elmer Taylor
wrote article on the subject sometime about 1980.
David Hendley
Maydelle, Texas
Andrew & Lucille Lubow on wed 21 may 97
John Conrad has several in his book Contemporay Ceramic Formulas. Here's one.
Cone 11 Shelves/Posts, R137
Mullite 50
Calcined Kaolin 20
Talc 20
Fine Grog 10
----------
From: Ceramic Arts Discussion List on behalf of John Baisch
Sent: Tuesday, May 20, 1997 11:55 AM
To: Multiple recipients of list CLAYART
Subject: Kiln furniture
----------------------------Original message----------------------------
I know this has been discussed before but I never got a good
last answer. I'm looking at building my own kiln
furniture for both high fire (Cone 10-11) and Salt.
Any good recipes would be greatly appreciated..
JB
Ric Swenson on thu 22 may 97
The keys to making refractories....especially shelves are in FORMING nad
FIRING. The formulation is the simple part. Forming, drying FLAT and
firing for a L O N G firing schedule are key to success. Talk to someone
at Thorleys about how they do it....with cast shelves...or at Acme - Marls
about pressed shelves. Those are the best products I've found.
Stilts are easy to make. Shelves are MUCH more effort than I found worth
troubling with. I tried RAM pressing and rolling and extruding shelves,
using a hydralic extruder. Some success but not worth the efforts.
IMHO
Ric
>----------------------------Original message----------------------------
>John Conrad has several in his book Contemporay Ceramic Formulas. Here's one.
>
>Cone 11 Shelves/Posts, R137
>
>Mullite 50
>Calcined Kaolin 20
>Talc 20
>Fine Grog 10
>
>
>----------
>From: Ceramic Arts Discussion List on behalf of John Baisch
>Sent: Tuesday, May 20, 1997 11:55 AM
>To: Multiple recipients of list CLAYART
>Subject: Kiln furniture
>
>----------------------------Original message----------------------------
>
>I know this has been discussed before but I never got a good
>last answer. I'm looking at building my own kiln
>furniture for both high fire (Cone 10-11) and Salt.
>
>Any good recipes would be greatly appreciated..
>
>JB
**********************************************************
Ric Swenson, Bennington College, Route 67-A Bennington, Vermont
05201-6001 ph 802 442-5401 x 262 fax x 237 (dedicated line for direct
fax 802 442-6164) email: rswenson@bennington.edu
NOTE: opinions expressed are my own, not necessarily those of my employer.
**********************************************************
Kris Bliss on wed 21 jan 98
greetings all ! I remember a while back we were
discussing the possibility of making your own kiln
posts. Course at the time, i wasn't paying attention.
now i am post poor and all $$ tied up in an expansion
project.
can we ressurect this thread one more time????
thank you all.
(it's still dark here most of the day but
warmed up to 20 above.)
kbliss@customcpu.com
13781 Arne Erickson Cir.
Anchorage, Alaska 99515
David Hendley on thu 22 jan 98
I make all my kiln posts. Extruded.
I use a 1 1/2" square die with a 3/8" hole in the center.
Here are some paragraphs I cut and pasted from
some of my posts last year:
This is how I get rid of my crumbled and broken insulating fire bricks.
The idea is to use as much firebrick grog as possible and still be able to
extrude a reasonably smooth tube.
I run the broken bricks through a hammer mill and screen
through "window screen" mesh.
If you don't have a mill, a good 3 pound sledge is just about as fast.
Try for about half and half - bricks/fireclay with 10% ball clay to
add a few fine particles.
Slake well and dry to soft plastic consistancy.
You need all the plasticity you can get, so don't skip the wet slaking.
I got the idea for this years ago when I found out that the Paragon Co.
that makes electric kilns in Texas did this with all the small pieces that
are left over when bricks are trimmed for a 12 sided kiln.
After extruding my kiln posts I roll them in alumina hydrate
for a good thick coating on all 6 sides.
NOTHING sticks to them, and this is in a wood fired kiln.
David Hendley
At 04:17 PM 1/21/98 EST, you wrote:
>----------------------------Original message----------------------------
> greetings all ! I remember a while back we were
> discussing the possibility of making your own kiln
> posts. Course at the time, i wasn't paying attention.
>
> now i am post poor and all $$ tied up in an expansion
> project.
>
> can we ressurect this thread one more time????
>
> thank you all.
> (it's still dark here most of the day but
> warmed up to 20 above.)
>
>kbliss@customcpu.com
>13781 Arne Erickson Cir.
>Anchorage, Alaska 99515
>
>
David Hendley
Maydelle, Texas
See David Hendley's Pottery Page at
http://www.sosis.com/hendley/david/
Cindy on thu 22 jan 98
Kris,
I just got a tip from a veteran potter. Haven't tried it yet, but no reason
to suppose it won't work. He said cut firebricks (hard ones) lengthwise
(use a brick scoring tool) to make four posts per brick.
Cindy in Custer, SD
Earl Brunner on thu 6 aug 98
Does anyone out there have a formula for making your own extruded kiln shelf
supports? I was wondering if this would even be practical? Michael Cardew
has some sagger recipes in his book Pioneer Pottery, but they seem to be for
more primitive conditions, I believe we have more specialized materials
available.
Earl Brunner
brunnerec@aol.com
http://users.aol.com/brunnerec
Andrew Lubow on fri 7 aug 98
Here's a formula I collected from one of Conrad's books.
Cone 11 Kiln Shelves/Posts, R 136
Mullite (Kyanite) 60
Calcined Kaolin 20
OM #4 10
Talc 10
-----Original Message-----
From: Earl Brunner
To: CLAYART@LSV.UKY.EDU
Date: Thursday, August 06, 1998 8:41 AM
Subject: kiln furniture
>----------------------------Original message----------------------------
>Does anyone out there have a formula for making your own extruded kiln
shelf
>supports? I was wondering if this would even be practical? Michael Cardew
>has some sagger recipes in his book Pioneer Pottery, but they seem to be
for
>more primitive conditions, I believe we have more specialized materials
>available.
>Earl Brunner
>brunnerec@aol.com
>http://users.aol.com/brunnerec
>
Cindy on sun 9 aug 98
Earl,
I don't know about extruding, but I'm told you can use scored and cut
high-temp hard fire bricks. You cut four posts from a brick.
Cindy Strnad
Earthen Vessels
Custer, SD
USA http://blackhills-info.com/a/cindys/menu.htm
> Does anyone out there have a formula for making your own extruded kiln
shelf
> supports? I was wondering if this would even be practical? Michael
Cardew
> has some sagger recipes in his book Pioneer Pottery, but they seem to be
for
> more primitive conditions, I believe we have more specialized materials
> available.
> Earl Brunner
> brunnerec@aol.com
> http://users.aol.com/brunnerec
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