amy parker on fri 30 jun 00
Arnold - If I shut off the kiln at 1190, I hit cone 5. If I cut back to
soak at 1185 for half an hour, I take out cone 6.
Amy
At 01:55 PM 6/30/00 -0700, you wrote:
>I have heard that, as a general rule, when a cone
>temperature is held for one hour, the heat work will
>fire the next hotter cone to maturity.
>
>I was wondering if anyone has experimented with this.
>Do the lower temperature cones need more hold time
>than hotter cones to mature the next cone #?
>
>Thanks,
>
>Arnold Howard
>
>
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amy parker Lithonia, GA
amyp@sd-software.com
pedresel@3-CITIES.COM on fri 30 jun 00
I've been playing with this a bit at ^5/6 but not being very scientific
about it. I've tried ramping up more slowly and holding a longer soak
to finish things off. My sitter shuts off when ^5 is just getting soft.
Then I've tried holding it for a 1/2 hour or hour soak to get the cone
just down. What I find is that with a slower firing the ^6 starts to
bend, too and you don't get as clean a separation between the cones.
As far as the glazes go, I'm not sure it gets me what I want so I need
to keep tweaking the parameters to get better results.
-- Evan in West Richland, WA where there is so much dust and ash in the
air I could probably use it as a glaze.
Arnold Howard wrote:
>
> I have heard that, as a general rule, when a cone
> temperature is held for one hour, the heat work will
> fire the next hotter cone to maturity.
>
Arnold Howard on fri 30 jun 00
I have heard that, as a general rule, when a cone
temperature is held for one hour, the heat work will
fire the next hotter cone to maturity.
I was wondering if anyone has experimented with this.
Do the lower temperature cones need more hold time
than hotter cones to mature the next cone #?
Thanks,
Arnold Howard
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WHC228@AOL.COM on sat 1 jul 00
Arnold
I have been using a long soak to bend my cones for more than ten years. I
fire to ^ 9 to ^ 11. I have no experience with the lower cones. I fire to
2260 F and soak for 4 hours. It is not the best way to do the job in most
cases, but if you need to mature a glaze that wants to blister at the higher
temperature it is a way to avoid the defect. It is however more expensive.
Bill
Jonathan Kaplan on sat 1 jul 00
We have used soak segments on our kilns, both gas and electric to even out
the temperature differentials as well as to insure a well developed glaze
surface.
Our controllers are programed to soak at a lower temperature then then end
point of the desired cone. We have learned that some of the electric kilns
require a 30 minute soak to even them up, or a 45 minute soak. And this
does indeed vary from kiln load to kiln load as the density of the ware as
well as that of the kiln furniture will affect heat transfer. And while the
basic theory of heat transfer, conduction, convection and radiation are
quite different in gas and electric kilns, the soak functions, or hold
functions, whether programmed with your controllers or manually done, work
well.
Our gas car kiln functions much in the same way, but as our loads are quite
uniform and consistant in terms of ware density, the set point on the
controller has been the same for along time. Recently, we completed a
project of about 1500 glazed trays. There were almost 60 kiln shelves, 20
layers 3 deep. Lots of refractory mass as well as ware. The set point on
the controller was much lower than our usual set point. The controller has
3 programs it can use. We usually program it to reach a set point, and then
hold that set point for what ever time we wish.
There are many things to take into consideration when trying to dial in
kilns for temperature uniformity as well as glaze surface. Controllers are
only as good as the knowledge and experience of their operators. They can
help provide consistant quality ware and give you a life. Equally, when
used incorrectly, can provide volumes of poorly fired ware destined for the
dumpster.
Jonathan
Jonathan Kaplan, president
Ceramic Design Group
PO Box 775112
Steamboat Springs CO 80477
voice and fax 970 879-9139
jonathan@csn,net
http://www.sni.net/ceramicdesigin
Plant Location:
1280 13th Street Unit 13
Steamboat Springs CO 80487
(please use this address for all deliveries via UPS, comman carrier, FEd
Ex, etc.)
Frederich, Tim on mon 3 jul 00
Arnold,
It will probably not make any difference whether it is a lower or
higher cone number. The variable will be that the hold time will not be
exactly the same for every cone due to the different compositions of the
cones and the varying number of degrees between the cones. The one hour/one
cone guide is just that, a guide. Every kiln is different and every firing
is not the same, so there will always be a number of variables to consider.
If you have more questions, please ask.
Tim Frederich, Orton Ceramic Foundation
> ----------
> From: Arnold Howard[SMTP:ajhparagon@YAHOO.COM]
> Sent: Friday, June 30, 2000 4:55 PM
> To: CLAYART@LSV.CERAMICS.ORG
> Subject: Using hold time to bend to the next cone
>
> I have heard that, as a general rule, when a cone
> temperature is held for one hour, the heat work will
> fire the next hotter cone to maturity.
>
> I was wondering if anyone has experimented with this.
> Do the lower temperature cones need more hold time
> than hotter cones to mature the next cone #?
>
> Thanks,
>
> Arnold Howard
>
>
> __________________________________________________
> Do You Yahoo!?
> Get Yahoo! Mail - Free email you can access from anywhere!
> http://mail.yahoo.com/
>
> __________________________________________________________________________
> ____
> 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.
>
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