Scott Hunnicutt on fri 17 feb 06
hey all,
another newbie firing question,
this time concerning cones, I have been looking at cone charts and all of
them have rate of temperature increase along the top(27c,108f etc)and in a
small manual 120v kiln like the olympic doll kiln I am looking at buying,
how do you find out the rate of temperature increase so you know which kind
of cones to buy?
thanks for any replies,
Scott Hunnicutt
Arnold Howard on fri 17 feb 06
The firing rate in the Orton cone chart is for the last 90 - 120 minutes of
the firing. The easiest way to measure firing rate is with a pyrometer. If
you don't have a pyrometer, you could get good results just by estimating
the firing speed.
Sincerely,
Arnold Howard
Paragon Industries, L.P., Mesquite, Texas USA
ahoward@paragonweb.com / www.paragonweb.com
----- Original Message -----
From: "Scott Hunnicutt"
> this time concerning cones, I have been looking at cone charts and all of
> them have rate of temperature increase along the top(27c,108f etc)and in a
> small manual 120v kiln like the olympic doll kiln I am looking at buying,
> how do you find out the rate of temperature increase so you know which
> kind
> of cones to buy?
William & Susan Schran User on fri 17 feb 06
On 2/17/06 8:38 AM, "Scott Hunnicutt" wrote:
> I have been looking at cone charts and all of
> them have rate of temperature increase along the top(27c,108f etc)and in a
> small manual 120v kiln like the olympic doll kiln I am looking at buying,
> how do you find out the rate of temperature increase so you know which kind
> of cones to buy?
The bending/melting of cones are a product of heat & time - "work heat".
The rate of temperature increase, especially in the last hour, will affect
what temperature the cone melts/falls.
You regulate the temperature climb by adjusting the controls/settings on a
manual kiln or inputting the data in a programmable kiln.
The small cones are/were intended to be used in the KilnSitter, a manual
shut off device. Many kilns with programmable controllers do not use a
KilnSitter, though one can be ordered with the kiln.
Large cones or Self Supporting cones are usually used as witness cones that
one observes through the spy hole during the firing.
I would recommend the use of witness cones even with a programmable kiln.
-- William "Bill" Schran
Fredericksburg, Virginia
wschran@cox.net
wschran@nvcc.edu
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