cathy kiss on fri 27 dec 96
Greetings- this being our first participation on the list. We have
a home-made raku kiln that we have set up at home. In the past we have used
a pyrometer to determine the kiln temp. However, we were recently told that
a pyrometer will only measure the rate of temp change - not the actual
temp. Could you all share your ideas and information on how to determine
temp. readings in side of kiln. I LOVE this list and am so grateful for the
air of support. Much thanks in advance!!
Paul Monaghan on sat 28 dec 96
cathy kiss wrote:
>
> ----------------------------Original message----------------------------
> Greetings- this being our first participation on the list. We have
> a home-made raku kiln that we have set up at home. In the past we have used
> a pyrometer to determine the kiln temp. However, we were recently told that
> a pyrometer will only measure the rate of temp change - not the actual
> temp. Could you all share your ideas and information on how to determine
> temp. readings in side of kiln. I LOVE this list and am so grateful for the
> air of support. Much thanks in advance!!
Cathy,
A pyrometer even an optical one WILL measure actual temperature not time
rate of change.
Paul Monaghan
--
Paul J. Monaghan email: paul@web2u.com
WEB2U Productions --- http://www.web2u.com
The "COOLEST" Site on the WEB
FREE email to SANTA on www.web2u.com
Marcia Selsor & Matt Benacquista on sat 28 dec 96
Dear Cathy,
Usually you can tell when a raku glaze is ready when it looks shiney
and liquid. This is not true for matt glazes. So, if you are not
usuing a pyrometer, make sure the glaze that you can see is, say,
crackle white or a luster. The glaze will bubble up to a what I call
"ready to flip pancake texture" and then flux out smooth. If you are
using matt glazes, use the pyrometer and keep track of what temp. works
for your glazes and try to be consistant.
Marcia in Montana
cathy kiss wrote:
>
> ----------------------------Original message----------------------------
> Greetings- this being our first participation on the list. We have
> a home-made raku kiln that we have set up at home. In the past we have used
> a pyrometer to determine the kiln temp. However, we were recently told that
> a pyrometer will only measure the rate of temp change - not the actual
> temp. Could you all share your ideas and information on how to determine
> temp. readings in side of kiln. I LOVE this list and am so grateful for the
> air of support. Much thanks in advance!!
--
Marci Selsor
Matt Benacquista
http://www.imt.net/~mjbmls/
mjbmls@imt.net
Numo Jaeger and Michael Miller on sat 28 dec 96
Cathy,
Do you have a peep hole in your homemade kiln? Can you see inside and see
the glazes?
I don't use a pyrometer at all with my Raku firing. I just peek periodically
to see the glaze first boil and then smooth over. I think it goes well with
the spirit of Raku firing too. Less gagetry involved.
What do the rest of you guys out there is cyberspace do? Do you all use
pyrometers?
Numo Jaeger
Studio One Art Center
and
San Leandro High School
jaegmil@ccnet.com
At 02:08 PM 12/27/96 EST, you wrote:
>----------------------------Original message----------------------------
> Greetings- this being our first participation on the list. We have
>a home-made raku kiln that we have set up at home. In the past we have used
>a pyrometer to determine the kiln temp. However, we were recently told that
>a pyrometer will only measure the rate of temp change - not the actual
>temp. Could you all share your ideas and information on how to determine
>temp. readings in side of kiln. I LOVE this list and am so grateful for the
>air of support. Much thanks in advance!!
>
>
Lori Wilkinson on sat 28 dec 96
Clayart,
>What do the rest of you guys out there is cyberspace do? Do you all
>use
>pyrometers?
Another thing to consider rather than the pyrometer is a test tile with
clear or crackle glaze in with the raku load. By visually observing the
test tile you get a pretty good idea of when the other pieces are ready.
I found this more reliable than a pyrometer.
Lori Wilkinson in Roswell NM with a new e-mail address. Just love this
spell check on Juno!
Don Sanami on sat 28 dec 96
y Dear Cathy, If I have an objection to Thermocouples over cones it is
that T.C. measurements under the best of conditions,(Multiple T.C.'s) are
site dependant and cannot measure the entire volume or the maturity of
the ware. Cones are very much better at doing the job of
indicating(indicating) maturity. I think one should never be dependant
upon any device: T.C., cones.Optical Prometers or eyeballs.For many
processes,long soaking is necessary for that final bit. Don M.On Sat, 28 Dec
1996, Marcia Selsor & Matt Benacquista wrote:
> ----------------------------Original message----------------------------
> Dear Cathy,
> Usually you can tell when a raku glaze is ready when it looks shiney
> and liquid. This is not true for matt glazes. So, if you are not
> usuing a pyrometer, make sure the glaze that you can see is, say,
> crackle white or a luster. The glaze will bubble up to a what I call
> "ready to flip pancake texture" and then flux out smooth. If you are
> using matt glazes, use the pyrometer and keep track of what temp. works
> for your glazes and try to be consistant.
> Marcia in Montana
>
> cathy kiss wrote:
> >
> > ----------------------------Original message----------------------------
> > Greetings- this being our first participation on the list. We have
> > a home-made raku kiln that we have set up at home. In the past we have used
> > a pyrometer to determine the kiln temp. However, we were recently told that
> > a pyrometer will only measure the rate of temp change - not the actual
> > temp. Could you all share your ideas and information on how to determine
> > temp. readings in side of kiln. I LOVE this list and am so grateful for the
> > air of support. Much thanks in advance!!
>
> --
> Marci Selsor
> Matt Benacquista
> http://www.imt.net/~mjbmls/
> mjbmls@imt.net
>
Harvey Sadow on mon 30 dec 96
cathy kiss wrote:
>
> ----------------------------Original message----------------------------
> we were recently told that
> a pyrometer will only measure the rate of temp change - not the actual
> temp. Could you all share your ideas and information on how to determine
> temp. readings in side of kiln.
Hi Cathy,
The temperature inside your kiln only matters to the surface you are
firing. You can tune your pyrometer by adjusting it to a temperature
that matches a melting cone, but even that is subjective because cone
melt is a factor of temperature and soaking time. What is really
important is that you achieve results that you like, and are able to
duplicate them or approximate the conditions which caused them. To do
this start by putting the pyrometer on the kiln. Fire to a goal
temperature. If the result is good, remember the temperature and
approximate rate of climb. If it is underfired, go a little higher, or
if overfired go a little lower. Keep records of your experiments and
results and you will begin to develop a set of successful results and a
guide to future testing. Eventually your work will become more
instinctive, but the pyrometer allows you to make decisions relative to
previous results.
Happy New Year To All,
Harvey Sadow
Ray Lemke on thu 2 jan 97
Cathy
I assume by "pyrometer" you are referring to a thermocouple and meter
type. These devices measure the temperature of the tip (where the two
wires are joined together), and are thus very site specific, and very
accurate if correctly calibrated. They offer no help with the
temperature soaking considerations required for some glazes, but this
is normally of limited concern for raku.
They are of great value in monitoring progress in the kiln, and
minimise the amount of time needed to visually check for glaze
melting, and thus dangerous infrared exposure to the eyes.
As a final suggestion, particularly if you are using a fuel fired
kiln, enclose the thermocouple sensor in a protective ceramic tube,
or it will have a fairly short lifetime due to corrosion. This slows
its response time slightly, but not enough to be of significance.
Happy potting!
Ray L. Lemke Voice: (613) 727-4723 (ext 5936)
Algonquin College Fax: (613) 598-3300
200 Lees Avenue
OTTAWA, Ont. K1S 0C5
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