Monday, 15 November 2010
Underfired ! - But Why?
In a bid to deal with the number of pots required over the Christmas period
I fired up the second hand kiln I bought on EBay a few months ago,
This was an attempt to fire two kilns one after the other.
But upon opening the Biscuit firing I found it was under fired.
We have had some bad storms and power cuts over the past week.
so I decided to fire the kiln again during the day while I was in the workshop
because all of the moisture had been driven out of the pots
I heated it up at 50 oc per hour up to 200 then moved it to 100 oc per hour
until 400oc, then it went on full power to 885oc.
the heat from 400 - 885 was incredibly quick, no more than 2 hours.
A classic sign of under fire.
But when I opened it, it was no different.
when I reached temperature I switched over my bentrup controller
to check if it said the same temperature, and it did within 2 0c.
isn't it strange how when you try to push on, something slows you down.
The elements all look OK
and the under fire was even throughout the kiln.
The colours are all wrong and the pots feel as if they have reached about 500 oc
but I'm not sure.
stupid me forgot to put some cones in to check the temperatures,
a natural thing to do when firing a kiln that is new to you.
So any suggestions would be welcome.
I've taken it all out and re fired it in the original kiln and it looks fine.
My thoughts on this sign.
in the time it took them to install this sign,
maybe they could have filled in the pot holes.
or is that just me.!
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