Tony Ferguson on wed 16 jan 02
It has been my understanding that cones in the wood kiln (more for a longer
firing than a short) tend to vary because of gasses, fly ash, (potter's who
like to throw in a handfull of salt to juicy things up a bit) tend to be 1-2
cones difference. I fire to cone 11 or 12 and things seem to work out fine.
Thank you.
Tony Ferguson
315 N. Lake Ave. Apt. 401
Duluth, MN 55806
USA
218.727.6339
Stoneware, Porcelain, Raku
http://www.AquariusArtGallery.com
----- Original Message -----
From: "Craig Edwards"
To:
Sent: Wednesday, January 16, 2002 11:39 AM
Subject: Re: Looking at cones OT
> Tim Wrote:
> >you can cause the cones to stop working in the proper manner. If the
cone
> >is in the beginning of the melting stage and hit with a blast of cold air
> >(what we call "freezing") it can form a shell on the cone and stop the
> >deformation of the cone. The cone may have to go to a much higher
> >temperature to begin deforming again. What usually happens is that the
> >next
> >higher cone will begin to deform and the lower cone number will remain
> >standing.
>
> Tim;
> This is a good point. On how cones can be affected by changes at critical
> times. Those of us that fire with wood can have some pretty interesting
> looking cones after they have been subjected to the fly ash and other
> atmospheres that can happen in a wood firing. Some are bloated, discolored
> and basically glazed over with ash etc.
> I wonder what temperature or Cone is actually achieved.
>
> Craig Edwards
> New London MN
>
>
>
>
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Craig Edwards on wed 16 jan 02
Tim Wrote:
>you can cause the cones to stop working in the proper manner. If the cone
>is in the beginning of the melting stage and hit with a blast of cold air
>(what we call "freezing") it can form a shell on the cone and stop the
>deformation of the cone. The cone may have to go to a much higher
>temperature to begin deforming again. What usually happens is that the
>next
>higher cone will begin to deform and the lower cone number will remain
>standing.
Tim;
This is a good point. On how cones can be affected by changes at critical
times. Those of us that fire with wood can have some pretty interesting
looking cones after they have been subjected to the fly ash and other
atmospheres that can happen in a wood firing. Some are bloated, discolored
and basically glazed over with ash etc.
I wonder what temperature or Cone is actually achieved.
Craig Edwards
New London MN
_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp.
Jonathan Pennington on wed 16 jan 02
Alright, I don't want to get too complicated, but since cones are measuring heat/time, isn't it pretty easy to calculate the actual cone without using actual cones? I tend to rely on cones- preferring that to my "black box" kiln controller, but now I see that cones are failable, given certain circumstances. (Even then, the cones are based on numbers and equations that I don't know anything about- never having met Mr. Orton :-) How about just reading the temperature and working out heat energy input based on time. Granted, in clean environments, cones seem to be standard/reliable enough, but if I had problems with the cones working, I'd use logs and math.
-J
(wait a minute, my temperature guage is digital... how do I know *that's* accurate?!)
> Tim Wrote:
> >you can cause the cones to stop working in the proper manner. If the cone
> >is in the beginning of the melting stage and hit with a blast of cold air
> >(what we call "freezing") it can form a shell on the cone and stop the
> >deformation of the cone. The cone may have to go to a much higher
> >temperature to begin deforming again. What usually happens is that the
> >next
> >higher cone will begin to deform and the lower cone number will remain
> >standing.
>
> Tim;
> This is a good point. On how cones can be affected by changes at critical
> times. Those of us that fire with wood can have some pretty interesting
> looking cones after they have been subjected to the fly ash and other
> atmospheres that can happen in a wood firing. Some are bloated, discolored
> and basically glazed over with ash etc.
> I wonder what temperature or Cone is actually achieved.
william schran on thu 17 jan 02
Jonathan - The problem with trying to predict cone temperature -
"heat over time" - is that in an electric kiln the elements will
degrade over time thus taking longer to reach the same temperature...
well you see the problem.
Bill
Ron Roy on fri 18 jan 02
Cause each load is going to require a different amount of heat - depending
on the desity of the stacking - and current varies depending on local load
conditions.
RR
>Alright, I don't want to get too complicated, but since cones are
>measuring heat/time, isn't it pretty easy to calculate the actual cone
>without using actual cones? I tend to rely on cones- preferring that to my
>"black box" kiln controller, but now I see that cones are failable, given
>certain circumstances. (Even then, the cones are based on numbers and
>equations that I don't know anything about- never having met Mr. Orton :-)
>How about just reading the temperature and working out heat energy input
>based on time. Granted, in clean environments, cones seem to be
>standard/reliable enough, but if I had problems with the cones working,
>I'd use logs and math.
Ron Roy
RR# 4
15084 Little Lake Rd..
Brighton,
Ontario, Canada
KOK 1H0
Residence 613-475-9544
Studio 613-475-3715
Fax 613-475-3513
Steve Mills on sat 19 jan 02
Our rule of thumb is:
Woodfire drop one cone, i.e. for 12 read 11
For salt: ditto
For Woodfired salt: drop one and a half! We fire 12 well over!
Consistent results would seem to indicate we're pretty close!
Steve
Bath
UK
In message , Tony Ferguson writes
>It has been my understanding that cones in the wood kiln (more for a long=
>er
>firing than a short) tend to vary because of gasses, fly ash, (potter's w=
>ho
>like to throw in a handfull of salt to juicy things up a bit) tend to be =
>1-2
>cones difference. I fire to cone 11 or 12 and things seem to work out fin=
>e.
>
>
>Thank you.
>
>Tony Ferguson
>315 N. Lake Ave. Apt. 401
>Duluth, MN 55806
>USA
>218.727.6339
>
>Stoneware, Porcelain, Raku
>http://www.AquariusArtGallery.com
>
>
>----- Original Message -----
>From: "Craig Edwards"
>To:
>Sent: Wednesday, January 16, 2002 11:39 AM
>Subject: Re: Looking at cones OT
>
>
>> Tim Wrote:
>> >you can cause the cones to stop working in the proper manner. If the
>cone
>> >is in the beginning of the melting stage and hit with a blast of cold =
>air
>> >(what we call "freezing") it can form a shell on the cone and stop the
>> >deformation of the cone. The cone may have to go to a much higher
>> >temperature to begin deforming again. What usually happens is that th=
>e
>> >next
>> >higher cone will begin to deform and the lower cone number will remain
>> >standing.
>>
>> Tim;
>> This is a good point. On how cones can be affected by changes at critic=
>al
>> times. Those of us that fire with wood can have some pretty interestin=
>g
>> looking cones after they have been subjected to the fly ash and other
>> atmospheres that can happen in a wood firing. Some are bloated, discolo=
>red
>> and basically glazed over with ash etc.
>> I wonder what temperature or Cone is actually achieved.
>>
>> Craig Edwards
>> New London MN
>>
>>
>>
>>
>> _________________________________________________________________
>> Get your FREE download of MSN Explorer at
>http://explorer.msn.com/intl.asp.
>>
>>
>_________________________________________________________________________=
>___
>__
>> Send postings to clayart@lsv.ceramics.org
>>
>> You may look at the archives for the list or change your subscription
>> settings from http://www.ceramics.org/clayart/
>>
>> Moderator of the list is Mel Jacobson who may be reached at
>melpots@pclink.com.
>
>
>
>_________________________________________________________
>Do You Yahoo!?
>Get your free @yahoo.com address at http://mail.yahoo.com
>
--
Steve Mills
Bath
UK
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