Elizabeth Priddy on fri 3 oct 08
At some point, not directly in line with one another, you might
try making a small notch in the foot ring to allow a space for the
expanding air underneath the plates to get out.=A0 As it is, if you have pe=
rfect rings,
like you say, and a perfect shelf, you will have a perfect air trap=20
in the spaces between the rings and across the center of the plate.
=A0
I threw perfect plates with perfect footrings and they warped.=A0 I was cre=
ating
an air situation under them on my perfectly flat shelves.=A0 These were in =
olden days
of perfectionism determining my actions.=A0 It still does, but now I am "aw=
are" of it
and can determine if it is good or bad.
=A0
The reason this might cause warping would be the slight movement of the bot=
tom
as the expanding air finds a way out.
=A0
Try it and see if it helps.
=A0
(And please do not write in and tell me a thousand reasons why this will=A0=
not work and that I don't know what I am talking about, other people.=A0 Th=
e recent thread on why do people leave clayart or why do experienced people=
not participate could be the response to this that you are already composi=
ng in your head and are about to send without a thought as to why I might h=
ave suggested this.=A0Because in your world, you never read that so it coul=
d not possibly be true.=A0 In my world, it goes like this:=A0 =A0I suggeste=
d it because I had the same problem, did this, and no more problem.=A0 Expe=
rience is usually the source of an answer from me.=A0 I have the T-shirt, "=
Ask me how I know this!"=A0 I almost responded to that thread with a cut an=
d paste of the bull naysaying and unhelpful criticism that I have saved in =
my mail in a file called "crazy people".=A0 And no, I will never tell you i=
f you or anyone you know is in there.=A0 I usually reference it before I se=
nd
in a scathing diatribe against someone's completely wacked advice or rant.=
=A0 If they are already in that file, I do not send anything, as it would d=
o no good.)
Elizabeth Priddy
Beaufort, NC - USA
Workshops and pottery online at:
http://www.elizabethpriddy.com
Natural Instincts Conference Information:
http://downtothepottershouse.com/NaturalInstincts.html
Kiln pictures and such:
http://www.flickr.com/photos/7973282@N03/
--- On Thu, 10/2/08, John Rodgers wrote:
From: John Rodgers
Subject: Quest: How to avoid warped plate rims
To: CLAYART@LSV.CERAMICS.ORG
Date: Thursday, October 2, 2008, 10:07 AM
Hopefully one of our gurus can help me here,
The rim warping has been one of the banes of my existence in pottery,
and I have never been able to fully resolve the issue. I make a fairly
large dinner plate/charger - 14 inch dia with a rim approx. 1-1/2 inch
wide for decoration purposes. The rim is carefully angled up and
material at the edge is approx 1/8th in when dry. It thickens quickly
for strength and support from the edge inward towards where the foot
ring is located. This adds extra strength for the cantilever effect of a
rim sticking out in the air with no support.
The charger/plate actually has two foot rings - one smaller on towards
the center of the plate, and a larger one near the outer diameter.
These plate foot rings are ground to perfection on a big sanding sheet I
have set up, so they are in perfect alignment with each other. Theya re
then placedon a perfectly flat round shelf, which has been coated with
loose alumina, to allow for easy movement of the clay as it shrinks. The
clear space between shelves is 3 inches, and there is one plate per
shelf. They are glaze fired to Cone 5, computer controlled firing, and
allowed full cool down to room temp before opening the kiln. Two out of
three plates will have a warped rim. Not terribly so, but not as near
perfection as I would like. I don't feel I can get top dollar for them
with the rims as they are.
I know factory plates are pretty much ALL made from hydraulically
pressing fairly dry clay, and consequently the clay is far more dense
than clay in my plates thrown on a wheel. This will make a difference.
But is there anything else I can do to help prevent/reduce this warpage
- keep it from happening?
I'm using C5 Laguna B-mix.
Thanks,
Regards,
John Rodgers
Chelsea, AL
=0A=0A=0A
James F on sat 4 oct 08
=20
> (And please do not write in and tell me a thousand reasons why this will =
not work and that I don't know what I am talking about=2C other people. Th=
e recent thread on why do people leave clayart or why do experienced people=
not participate could be the response to this that you are already composi=
ng in your head and are about to send without a thought as to why I might h=
ave suggested this. Because in your world=2C you never read that so it coul=
d not possibly be true. In my world=2C it goes like this: I suggested it=
because I had the same problem=2C did this=2C and no more problem. Experi=
ence is usually the source of an answer from me. I have the T-shirt=2C 'As=
k me how I know this!' I almost responded to that thread with a cut and pa=
ste of the bull naysaying and unhelpful criticism that I have saved in my m=
ail in a file called 'crazy people'. And no=2C I will never tell you if yo=
u or anyone you know is in there. I usually reference it before I send
> in a scathing diatribe against someone's completely wacked advice or ran=
t. If they are already in that file=2C I do not send anything=2C as it wou=
ld do no good.)
>=20
> Elizabeth Priddy
Madam...
Am I to understand that taking issue with what you or anyone else has claim=
ed automatically constitutes 'naysaying and unhelpful criticism'? That dis=
puting your conclusion or that of anyone else is off limits as constituting=
bullying? That open dialog is not the raison d'etra of clayart? That sug=
gesting that you or anyone else may have committed the logical fallacy of P=
ost Hoc Ergo Propter Hoc defines one as 'crazy people'?
Questioning is not necessarily bullying. Your closing remarks do read a bi=
t like bullying.
Perhaps there is a market for a T-shirt that reads 'Ask me why I believe th=
is'. 'Know' is such an absolute.
Respectfully submitted...
...James
_________________________________________________________________
Stay up to date on your PC=2C the Web=2C and your mobile phone with Windows=
Live.
http://clk.atdmt.com/MRT/go/msnnkwxp1020093185mrt/direct/01/=
Elizabeth Priddy on sat 4 oct 08
And there you have it!
=A0
Another example of why people stop bothering...
Elizabeth Priddy
Beaufort, NC - USA
Questioning is not necessarily bullying. Your closing remarks do read a bi=
t
like bullying.
Perhaps there is a market for a T-shirt that reads 'Ask me why I believe
this'. 'Know' is such an absolute.
Respectfully submitted...
...James
_________________________________________________________________
Stay up to date on your PC, the Web, and your mobile phone with Windows Liv=
e.
http://clk.atdmt.com/MRT/go/msnnkwxp1020093185mrt/direct/01/=0A=0A=0A
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