Earl Brunner on sun 6 jun 04
The problem you are really having seems to me to be that you want the
digital controller temperature to reflect the actual temperature; in reality
IT DOESN"T MATTER what that number is, as long as it drops the desired cone
and is consistent in doing so.
I fire 5 different kilns with programmable controllers, I use basically the
same ramp/hold schedule for all of them, but in order to have the cones drop
correctly, I don't think ANY of them are set to fire at the exact same
temperature on the gauge. But it's the cones that matter not the gauge. One
just has to find out what to TELL the kiln to do in order to get the correct
cone.
Earl Brunner
Las Vegas, NV
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of lewis ramage
Sent: Saturday, June 05, 2004 11:29 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Controller vs. Cone, problems calibrating and always over-fired
I'm having a real problem firing to desired cone using my kiln controller.
I know my heating rate - it's 60C/hr at 1100-1200 dropping quickly to 40C/hr
@1280.
My first firing to Cone 10 was set to 1280C and was way overfired Cone 10
was a horizontal droopy blob - as would be expected with that slow heating
rate (which I couldn't know about until I'd monitored it, of course).
My second firing to Cone10 was set to 1240C and was a bit over fired, Cone
10 was bent right over. I had used the Orton Conecalc program to find that
temperature, and it should have been a good Cone 10: it was close enough. .
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