Berry Silverman on sat 1 may 99
The thread about improved insulation on electric kilns
shortening firing time brings to mind another
question: How about those of us who need to reload
and fire again as soon as possible? I assume the
improved insulation slows the cooling time. Are there
steps that can be taken to safely speed cooling time
without damage to the ware? (We're firing to cone
05).
===
Berry Silverman,
Berryware, Tucson, Arizona
berrysilverman@yahoo.com
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Euclids on mon 3 may 99
> The thread about improved insulation on electric kilns
> shortening firing time brings to mind another
> question: How about those of us who need to reload
> and fire again as soon as possible? I assume the
> improved insulation slows the cooling time. Are there
> steps that can be taken to safely speed cooling time
> without damage to the ware? (We're firing to cone
> Berry Silverman,
Hi Berry,
Two things come to mind right away.
1. A downdraft vent will help cool the kiln at a constant rate. This will
not usually cause any damage to the ware....but the potential is there
(thermal shock). With an Orton controller connected to the vent itself, you
can have the controller turn the vent on & off at any time during the
firing ... so, you can control the cooling to some extent.
2. Blow air over the outside of the kiln. This works very well. With this
method there is no thermal shock to the ware inside the kiln.
A combination of downdraft vent & a fan blowing on the outside of a kiln
should decrease cooling time substantially.
I`m glad you brought this up. People use kilns for different purposes.
Chris @
Euclids Kilns & Elements
1-800-296-5456
euclids.com
mail@euclids.com
Berry Silverman on tue 4 may 99
--- Euclids wrote:
> ----------------------------Original
> message----------------------------
> > The thread about improved insulation on electric
> kilns
> > shortening firing time brings to mind another
> > question: How about those of us who need to
> reload
> > and fire again as soon as possible? I assume the
> > improved insulation slows the cooling time. Are
> there
> > steps that can be taken to safely speed cooling
> time
> > without damage to the ware? (We're firing to cone
> > Berry Silverman,
>
> Hi Berry,
> Two things come to mind right away.
> 1. A downdraft vent will help cool the kiln at a
> constant rate. This will
> not usually cause any damage to the ware....but the
> potential is there
> (thermal shock). With an Orton controller connected
> to the vent itself, you
> can have the controller turn the vent on & off at
> any time during the
> firing ... so, you can control the cooling to some
> extent.
> 2. Blow air over the outside of the kiln. This works
> very well. With this
> method there is no thermal shock to the ware inside
> the kiln.
> A combination of downdraft vent & a fan blowing on
> the outside of a kiln
> should decrease cooling time substantially.
>
> I`m glad you brought this up. People use kilns for
> different purposes.
> Chris @
> Euclids Kilns & Elements
> 1-800-296-5456
> euclids.com
> mail@euclids.com
>
Chris, thanks for your reply to my post. Right now I
am using Skutt 1227s -- 4 of them. I know one of
these days I'm going to have to consider larger,
perhaps more industrial-type kilns. I always read
your posts on Clayart and know who to contact when I
ready with questions.
===
Berry Silverman,
Berryware, Tucson, Arizona
berrysilverman@yahoo.com
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eden@sover.net on mon 17 may 99
Hi Chris,
Will you please expand on this? What is the schedule you would use for the
blower when there are big platters and stuff in the firing that are
especially prone to thermal cracking?
With an Orton controller connected to the vent itself, you
>can have the controller turn the vent on & off at any time during the
>firing ... so, you can control the cooling to some extent.
Thanks, Eleanora
............
Eleanora Eden 802 869-2003
Paradise Hill
Bellows Falls, VT 05101 eden@sover.net
Euclids on wed 19 may 99
> Hi Chris,
> Will you please expand on this? What is the schedule you would use for
the
> blower when there are big platters and stuff in the firing that are
> especially prone to thermal cracking?
>
> With an Orton controller connected to the vent itself, you
> >can have the controller turn the vent on & off at any time during the
> >firing ... so, you can control the cooling to some extent.
Hi Eleanora,
I would rather not comment on an exact schedule for you, as it depends on
the thickness of the pieces,
speed of firing, past firing history of problematic pieces, ect... Refer
to Orton themselves
@ 800-999-5442.
In the Autofire controller each user program has 10 segments that are
linked together to make a program. Each segment contains a ramp speed, a
set point, a hold feature & vent a "on or off" feature. As you can see,
with this feature the vent can come on at any point during the firing.
Alot of people will turn off the vent when the kiln reaches temperature. If
the vent is left on (or switched on), this will speed the cooling process.
The typical vent operation is as follows:
During heat up,
-"on" at 100`F
-"off" at 1450`F ......kiln reaches temperature
During cool down,
-"on" at 1000`F
-"off" at 300`F .......kilns cools naturally to room temp.
Chris @
Euclids Kilns & Elements
1-800-296-5456
euclids.com
mail@euclids.com
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