finearts@mesa.k12.co.us on fri 22 nov 96
my TNF 28-3 has been over and under fireing consistantly since I bought
it. Has anyone else had problems with this model or is it just the clay
gods striking me down. Help. :( If you know anything that my help let me
know.
I have check all the conections and evn had the company send almost all
replacement parts including mother board and nothing has helped. Any
ideas?
Thanks
Raper Finearts Studios
Grand Junction, CO
Jonathan Kaplan on sat 23 nov 96
>----------------------------Original message----------------------------
>
>my TNF 28-3 has been over and under fireing consistantly since I bought
>it. Has anyone else had problems with this model or is it just the clay
>gods striking me down. Help. :( If you know anything that my help let me
>know.
>
>I have check all the conections and evn had the company send almost all
>replacement parts including mother board and nothing has helped. Any
>ideas?
>
>
>Thanks
>Raper Finearts Studios
>Grand Junction, CO
Having used these kilns for well over 6 years of so in a production
situation, you might wish to try the following.
I would suggest that you need to re think the way you program your
controller so that you build a soak into the firing cycle. If you program
the controller to fire to what ever the end point of the cone is, the kiln
will consistently over fire.
If your ambient temperature in the studio is 70 degrees or so, subrtract
that from the end point of the cone, and then assign an arbitrary number
for the load factor-in other words, a heavy load, say 100 degrees, and a
light load say 50 degrees. The more furniture and pots in the kiln, the
more BTU's you need to reach temperature, and this number will always be
different then whatever the end point of the cone is, and what ever number
the controller is showing as the current temperature.
So if your load is quite full and the ambient temperature in the studiois
say 70 degrees, try subtracting 150 degrees from the end point of the cone.
If you use the pre-preogrammed cone end points that are built into the
controller as a starting point, this new number will be a good reference.
For example, if we want a cone 06 firing in our TnF 28-3 kilns, the end
point for me, and please note this works for me and may not work for you,
is 1800 degrees with a 2 hour soak at the end. Over many years, this has
provided me with consistant cone 06 firings top to bottom regardless of the
load. Remember that cone end points are calculated with these controllers
on an empty kiln, thus firing un-encumbered with pots and furniture.
Always us cones in the kiln as the absolute reference as they will monitor
your firing for both temperature and time.
Call me if I can be of further assistance.
Jonathan, in Steamboat Springs
Jonathan Kaplan
Ceramic Design Group Ltd./Production Services
PO Box 775112
Steamboat Springs CO 80477
jonathan@csn.net
(970) 879-9139*voice and fax
http://www.craftweb.com/org/jkaplan/cdg.shtml
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