clennell on fri 26 nov 99
>----------------------------Original message----------------------------
>First, the answer is no, not likely there would be significant difference
>in your morning temp.
>My question is...unless you are firing greenware, and you need to candle,
>why are you firing untended (assumed) overnite? If you are firing bisqued
>ware there is no good reason to candle and go so slowly. I suggest turning
>it on in the morning with the burners on full (in earnest) and fire it up.
>It will save fuel and time and be safer than having the burners on all
>night. Nils
>
>On Tue, 23 Nov 1999, Corinne P. Null wrote:
>
>> ----------------------------Original message----------------------------
>> I am wondering how much change there would be in my firing schedule if I
>> applied ITC to my kilns. Do they really fire faster? Currently I candle
>> from noon to evening reaching @ 300F. I leave the main burners on low
>> overnight and by morning it's usually around 1200-1300F, and then we start
>> firing in ernest. If I apply ITC am I going to get more rise overnight? I
>> really don't want any more rise...
>>
>> Corinne Null
>> Bedford, New Hampshire
>>
>>
>>
Corinne: I too, candle overnight for a glaze firing.
Why???? Because I seem to get better and more even firings. I remember a
lecture by Gary Hatcher- a sometime clayarter and wood fire guy in Texas.
He said-" heat goes where heat is".If you start your burners full force in
the morning the heat will form a path to your flue. The heat will just like
water take the easy way out and will follow this path throughout the
firing. I believe that by warming the kiln overnight the whole kiln is a
pathway and the kiln tends to be more even.
whenever i have thought I need to rush this , turn on the burners, get it
going, the firing has been less than stellar.
I think that turning burners on full monty is why some potters have sour
spots in their kilns " Heat goes where heat is."
Garys analogy was that fire was like water. It would always take the easy
way out
If you have proper safeties on your burners you should sleep soundly
knowing your pots are warming slowly and you can fire the kiln off
tomorrow.
haste makes waste.
Cheers,
tony
Tony and Sheila Clennell
Sour Cherry Pottery
4545 King St.
Beamsville, On. L0R 1B1
http://www.sourcherrypottery.com
e-mail:clennell@bestnet.org
905-563-9382
fax 905-563-9383
Dorothy Weber on sun 28 nov 99
Nils raises an interesting question about candling. If the firing is a glaze
firing of bisque ware, is there any need to candle other that to get the
moisture out of the glaze? Then the follow up question is, do we have to
worry about quartz inversion for this same type of firing or can we really
just let it rip right from the start?
Ron Roy on mon 29 nov 99
I don't believe the ware will be harmed by fast firing from the start -
more likely to affect some glazes which may be subject to the raw cracking
that leads to crawing.
Certainly a bad idea if there are any refires in the load.
It has to be hard on your shelves and bricks. After many firings at
stoneware temperatures there is a build up of cristobalite in many
refractory products - certainly bricks. Going through cristobalite and
quartz inversions fast is certainly going to have an effect on the life of
these products.
RR
>----------------------------Original message----------------------------
>Nils raises an interesting question about candling. If the firing is a glaze
>firing of bisque ware, is there any need to candle other that to get the
>moisture out of the glaze? Then the follow up question is, do we have to
>worry about quartz inversion for this same type of firing or can we really
>just let it rip right from the start?
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
Nils Lou on mon 29 nov 99
No sense worrying about quartz inversion; it will happen anyway. Is it a
problem? Only if the clay is vitreous. Is it? No. No worry. Just slow down
on the cooling where all the good stuff happens anyway. As for candling
"to get the moisture out of the glaze" let 'er rip. In about five minutes
the water is gone. By the way, don't pay any "tention to Tony--he's and
old lady potter--likes to go slow, so we let him. Likes the old sayings
like heat likes heat and stuff--mystery musings. 'sides, he's a foreigner.
Nils
On Sun, 28 Nov 1999, Dorothy Weber wrote:
> ----------------------------Original message----------------------------
> Nils raises an interesting question about candling. If the firing is a glaze
> firing of bisque ware, is there any need to candle other that to get the
> moisture out of the glaze? Then the follow up question is, do we have to
> worry about quartz inversion for this same type of firing or can we really
> just let it rip right from the start?
>
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