Lili Krakowski on thu 24 jan 08
Some days ago I was asked both on list and off what I used to make kiln
posts. Now the questioners may think I am evil and selfish, and do not want
to share. Fact is, I am rather untidy and could not find the relevant
notebook!
The mix comes out of Ceramics Monthly April 1978 an article on kiln
furniture! The mix is
XX Sagger Clay 25
Kaolin 25
30 mesh grog 50
My hand written note adds "stoneware or porcelain" and I think it means the
grog.
What I did was to cut the bottom off orange plastic pill bottles. I then
have sprayed the insides with cooking spray and rammed coils of the mix into
them. One coil per bottle. I tamped the mix down, making sure the bottom
of the bottle was held firmly against a table top, or similar, so that the
tamping, ramming, etc really compacted the mix. The mix itself, the coils
of it, were pretty dry--I should say as dry as was workable. When the stuff
had set up a bit it was easy to push each coil out of its tube, dry, bisque
and use.
I have used these only up to c. 6 and they have done well.
Lili Krakowski
Be of good courage
Pat Lindemann on fri 25 jan 08
I have used this recipe also and made kiln posts with my extruder- all
lengths. And then I rolled them in alumina hydrate (David Hendley tip). I
have used these to ^10 and a bit beyond- no trouble at all. When I cut a
batch of the same length, I usually line them up on the table and put a 2x4
on top of all of them at once and compact gently to be sure of them all
having a matching height. The recipe came from an old CM magazine from the
70s or 80s.
take care,
Pat in SD, where the cold spell of below zero weather may be over, it was 36
yesterday and is supposed to be higher today!
On Jan 24, 2008 3:04 PM, Lili Krakowski wrote:
> Some days ago I was asked both on list and off what I used to make kiln
> posts. Now the questioners may think I am evil and selfish, and do not
> want
> to share. Fact is, I am rather untidy and could not find the relevant
> notebook!
>
> The mix comes out of Ceramics Monthly April 1978 an article on kiln
> furniture! The mix is
>
> XX Sagger Clay 25
> Kaolin 25
> 30 mesh grog 50
>
> My hand written note adds "stoneware or porcelain" and I think it means
> the
> grog.
>
> What I did was to cut the bottom off orange plastic pill bottles. I then
> have sprayed the insides with cooking spray and rammed coils of the mix
> into
> them. One coil per bottle. I tamped the mix down, making sure the
> bottom
> of the bottle was held firmly against a table top, or similar, so that the
> tamping, ramming, etc really compacted the mix. The mix itself, the coils
> of it, were pretty dry--I should say as dry as was workable. When the
> stuff
> had set up a bit it was easy to push each coil out of its tube, dry,
> bisque
> and use.
>
> I have used these only up to c. 6 and they have done well.
>
> Lili Krakowski
> Be of good courage
>
>
> ______________________________________________________________________________
> Clayart members may send postings to: clayart@lsv.ceramics.org
>
> You may look at the archives for the list, post messages, or change your
> subscription settings here: http://www.acers.org/cic/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
> melpots2@visi.com
>
Loren JOnes on thu 14 feb 08
I have a question for all of you. I have always been told to set kiln shelves on a tripod of posts. The guild I am working with sort of does this but the bottom shelves are spanned across three rows of bricks. Is that the same? All of their shelves are warped and I fear that is why. In addition they are looking to buy new nitride bonded shelves. I would hate to see them ruin their new shelves with this practice. I'll take my answer off the air. Loren
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Bruce Girrell on fri 15 feb 08
Three posts are used because 1) a three point support will always be stable,
while four or more points may result in a shelf that rocks and 2) each
additional post takes up more shelf space and 3 is the minimum that works
The primary thing about stacking is that the load (the weight of the shelf
and anything on it, including shelves above it) must transfer directly
downward to support below the shelf. It doesn't matter whether the support
below is brick or another kiln post, just as long as each kiln post has
something _directly_ under it on the bottom side of the shelf.
Bruce "dang, I wish we could post pictures" Girrell
William & Susan Schran User on fri 15 feb 08
On 2/15/08 12:27 AM, "Loren JOnes" wrote:
> I have a question for all of you. I have always been told to set kiln shelves
> on a tripod of posts. The guild I am working with sort of does this but the
> bottom shelves are spanned across three rows of bricks. Is that the same? All
> of their shelves are warped and I fear that is why. In addition they are
> looking to buy new nitride bonded shelves. I would hate to see them ruin their
> new shelves with this practice. I'll take my answer off the air.
No. you'll get your answer on the air as this may be helpful to others.
I have always used the tripod support method for all shelf construction in
kilns, with the exception of smaller top loaders where there is a full shelf
at the bottom and I will be using half shelves above - then 4 posts for
supporting the bottom shelf off the floor.
In our Geil kiln our bottom shelves sit on the floor of the kiln -
recommendation of the manufacturer.
I see no specific problem with the rows of brick for the bottom shelf
support.
Warping is not necessarily caused by the support, more likely cause is not
rotating (flipping) the shelves over. Depending on the type of shelves used,
rotating may need to be done routinely or occasionally. Yes, that does mean
removing kiln wash from the shelves.
Using nitride bonded shelves will not require rotating as much, but still
needs to be done occasionally. They will have less of a tendency to warp
than cordierite or high alumina shelves.
Only shelves that don't require rotating are Advancers. If those are used
then I would advise against supporting them with bricks as this would cause
hot zones and may lead to cracking.
Bill
--
William "Bill" Schran
wschran@cox.net
wschran@nvcc.edu
http://www.creativecreekartisans.com
mark Cortright on sat 16 feb 08
On Thu, 14 Feb 2008 21:27:41 -0800, Loren JOnes wrote:
>I have a question for all of you. I have always been told to set kiln shelves on a tripod of posts.
The guild I am working with sort of does this but the bottom shelves are spanned across three
rows of bricks. Is that the same? All of their shelves are warped and I fear that is why. In addition
they are looking to buy new nitride bonded shelves. I would hate to see them ruin their new
shelves with this practice. I'll take my answer off the air. Loren
>
>
>
>A photo here would really help so I posted them at my flicker site-Todays am Bisque and Pm
Glaze
load show the correct stacking on advancer shelves. This was a long day of Glazing-more small
pots than normal. Do not worry to much about using soaps as stilts. I have not had any trouble
with them cracking advancers. At least in the first 300 glaze fires. I'll lite this baby at 6am
tomorrow morn.There is also the floor layout for our shelves of the salt kiln there on page two.
Mark
Post photos here>>>>>>>>http://www.flickr.com/photos/23813860@N06/
Mark Cortright
Arcata ca
www.liscomhillpottery.com
MudFire - Luba & Erik on fri 29 feb 08
Just wanted to let everyone know that I've just received my shipment of =
posts from Bear Creek Pottery.... And they are wonderful! Sturdy and =
straight... and not "sticky" porcelain...(unlike some others' I've =
bought in the past). And they packed them so well that not a single one =
got nicked - and I got 4 big boxes full. Very, very happy with my order.
So.... and I certainly won't bring up that "whole thing" again... but if =
you need posts, check the archives in mid January for their offer. I =
think these are probably the best posts I've yet to buy - and the price =
is right too! BTW - I have no connection to this company, just wanted =
to let you know.
Luba
MudFire Clayworks & Gallery
Open Studio * Workshops * Exhibits
175 Laredo Dr, Decatur, GA 30030
404-377-8033
www.mudfire.com
Rog Coman on sat 1 mar 08
Hi Luba,
I received the Bear Creek flyer on Clayart, as you did, and I have been
trying to contact them for over a month, but to no avail. Please tell me
how you got in contact with them. Thanks,
Rog Coman
Fish Hook Pottery
Montrose, CO
----- Original Message -----
From: "MudFire - Luba & Erik"
To:
Sent: Friday, February 29, 2008 9:50 AM
Subject: kiln posts
Just wanted to let everyone know that I've just received my shipment of
posts from Bear Creek Pottery.... And they are wonderful! Sturdy and
straight... and not "sticky" porcelain...(unlike some others' I've bought in
the past). And they packed them so well that not a single one got nicked -
and I got 4 big boxes full. Very, very happy with my order.
So.... and I certainly won't bring up that "whole thing" again... but if you
need posts, check the archives in mid January for their offer. I think
these are probably the best posts I've yet to buy - and the price is right
too! BTW - I have no connection to this company, just wanted to let you
know.
Luba
MudFire Clayworks & Gallery
Open Studio * Workshops * Exhibits
175 Laredo Dr, Decatur, GA 30030
404-377-8033
www.mudfire.com
______________________________________________________________________________
Clayart members may send postings to: clayart@lsv.ceramics.org
You may look at the archives for the list, post messages, change your
subscription settings or unsubscribe/leave the list here:
http://www.acers.org/cic/clayart/
Moderator of the list is Mel Jacobson who may be reached at
melpots2@visi.com
Nathan Gartz on tue 4 mar 08
Yup, I just got mine today as well and they are wonderful! Best posts I've
seen around for the price. They are a bit heavier than the other ones I
have at the studio, but it's not the biggest deal. The reason I bring up
the weight is because I am working with crystalline right now and I wanted
to cut down on the thermal mass inside the kiln to reduce the time it takes
to get the kiln up to temp, as I have advancers to cut down on the mass as
well... But I don't think an extra pound or so will make a difference.
These are actually thinner than the ones we have at the studio, but they are
just more dense. They just feel stronger! I would have bought twice as
many if I would have known their quality beforehand! Well worth it!
I hate to say it, but the ad was well worth it for me! Much better than the
normal "DEAREST ONE, PLEASE GAT BACK TO ME.... I have to appeal to you to
assist me concerning my late father's deposited in a Financial Company here
in Ghana the sum of $14,000,000 (fourteen million united state dollars)"
spam mail that I get every day! I'd take that over stupid crap spam anyday.
If anything, the new software that the listserv will run on should be paid
for by small banners. I wouldn't mind. You see it everywhere now-a-days
anyway. potters.org is already using google's ad sense so what's the
difference? With company ads, potters.org would actually be able to get
some nice software because those ads would actually generate a decent buck
(rather than 1/10000th of a penny for every click on the google ad sense
banner).
Nathan
Nathan Gartz
web: nathangartz.com
email: nathan.gartz (at) gmail.com
On Fri, 29 Feb 2008 11:50:47 -0500, MudFire - Luba & Erik
wrote:
>Just wanted to let everyone know that I've just received my shipment of
posts from Bear Creek Pottery.... And they are wonderful! Sturdy and
straight...
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