Cl Litman on sun 21 jul 02
You can fire down in an electric kiln by turning it back on after it
shuts off. Turn all the switches to off, then lift the rod, push the on
button and carefully/gently set the rod back down and turn the switches
back on to whatever setting you want. It will stay on, the rod will stay
cocked at an angle if you do it gently enough.
Ideally you'd have a have a pyrometer and can see the temperature of the
kiln and could adjust the switches to maintain a constant rate of
cooling.
I used to do a staged cooldown by turning each of the 3 switches down a
notch every 15 minutes (after turning it on again I'd turn all but one
switch back to high).
top..............medium
middle.........high
bottom.........high
wait 15 minutes
top..............medium
middle.........medium
bottom.........high
wait 15 minutes
top..............medium
middle.........medium
bottom.........medium
wait 15 minutes
top..............low
middle.........medium
bottom.........medium
and so on
Cheryl Litman - NJ
cheryllitman@juno.com
Millie Carpenter on thu 25 jul 02
Cheryl and any one else
I do a similar program for firing down. but I picked 20 minutes for
each stage and I have fewer stages. Is there a standardized formula
for time at each level or is it arbitrary? is kiln size a factor? Is
cone fired to a factor? I computerized controller on this kiln. I
don't have a pyrometer.
Millie in Muggy Maryland.
Cl Litman wrote:
>
>
>I used to do a staged cooldown by turning each of the 3 switches down a
>notch every 15 minutes (after turning it on again I'd turn all but one
>switch back to high).
>
>top..............medium
>middle.........high
>bottom.........high
>
>wait 15 minutes
>
>top..............medium
>middle.........medium
>bottom.........high
>
>wait 15 minutes
>
>top..............medium
>middle.........medium
>bottom.........medium
>
>wait 15 minutes
>
>top..............low
>middle.........medium
>bottom.........medium
>
>and so on
>
Cl Litman on fri 26 jul 02
My profile was arbitrary since I didn't have a pyrometer and had no idea
what was going on in the kiln. Marvin Flowerman from my guild was the
first to suggest firing down and I adapted what he was doing. Most of my
glazes looked better when I began doing the staged cool down. Since I
got a digital controller I no longer do it that way. I use a profile
that Jan Walker posted to clayart many years ago. No time to post that
again now but if someone wants I can post next week.
Cheryl Litman - NJ
cheryllitman@juno.com
On Thu, 25 Jul 2002 23:38:29 -0400 Millie Carpenter
writes:
> Cheryl and any one else
>
> I do a similar program for firing down. but I picked 20 minutes
> for
> each stage and I have fewer stages. Is there a standardized
> formula
> for time at each level or is it arbitrary? is kiln size a factor?
> Is
> cone fired to a factor? I computerized controller on this kiln.
> I
> don't have a pyrometer.
>
> Millie in Muggy Maryland.
>
> Cl Litman wrote:
>
> >
> >
> >I used to do a staged cooldown by turning each of the 3 switches
> down a
> >notch every 15 minutes (after turning it on again I'd turn all but
> one
> >switch back to high).
> >
> >top..............medium
> >middle.........high
> >bottom.........high
> >
> >wait 15 minutes
> >
> >top..............medium
> >middle.........medium
> >bottom.........high
> >
Arnold Howard on fri 26 jul 02
You can program a cool-down in the controller's ramp-hold mode.
(I'm not sure about the specifics of the different brands.)
Program a final segment with the cooling rate. Enter a shut off
temperature. Since this is a lower temperature than the firing
maturity temperature, the last segment will be a cool-down segment.
This should work in any recently made controller.
Paragon's Sentry controller has a prompt for slow cooling in
cone-fire mode. During programming, "COOL" appears. Enter 0 if you
do not want a cooling segment. Otherwise, enter a cooling rate
between 1 - 180 deg. F. The kiln will cool down at your rate, then
shut off at 392 deg. F./ 200 deg. C.
With best wishes,
Arnold Howard
Paragon
--- Millie Carpenter wrote:
> Cheryl and any one else
>
> I do a similar program for firing down. but I picked 20 minutes
> for
> each stage and I have fewer stages. Is there a standardized
> formula
> for time at each level or is it arbitrary? is kiln size a
> factor? Is
> cone fired to a factor? I computerized controller on this kiln.
> I
> don't have a pyrometer.
>
> Millie in Muggy Maryland.
>
> Cl Litman wrote:
>
> >
> >
> >I used to do a staged cooldown by turning each of the 3 switches
> down a
> >notch every 15 minutes (after turning it on again I'd turn all
> but one
> >switch back to high).
> >
> >top..............medium
> >middle.........high
> >bottom.........high
> >
> >wait 15 minutes
> >
> >top..............medium
> >middle.........medium
> >bottom.........high
> >
> >wait 15 minutes
> >
> >top..............medium
> >middle.........medium
> >bottom.........medium
> >
> >wait 15 minutes
> >
> >top..............low
> >middle.........medium
> >bottom.........medium
> >
> >and so on
> >
>
>
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