centa uhalde on fri 19 jun 98
Hi,
I was wondering if stuff that is not bone dry but just beyond the leather
hard stage can be candled for some period of time (?) before proceeding
with a firing schedule. ??
Thanks as usual,
Centa
Pierre Brayford on sat 20 jun 98
centa uhalde wrote:
>
> ----------------------------Original message----------------------------
> Hi,
> I was wondering if stuff that is not bone dry but just beyond the leather
> hard stage can be candled for some period of time (?) before proceeding
> with a firing schedule. ??
>
> Thanks as usual,
> Centa
YES - keep temperature low, below 100degC -How long for?
Depends on how wet, how thick etc., Do it for how long you think is
right and then for a few hours more! If you start increasing the heat
too soon the pots will explode!
--
Pierre Brayford
Old School Pottery, Edgton
Shropshire, U.K.
Laura Conley on sat 20 jun 98
Centa,
Yes, this is very common. Determine the length of the candle by how wet the
ware is (and how thick). Be sure you stay under 212F - a rather low heat is
sufficient. The only drawbacks are 1) cost of gas/electricity and 2)
quick/uneven drying could cause cracking, but this drying is usually even and
if the pieces are already past leather hard, very rarely a problem. I worked
in a studio where thick, wet (sometimes plastic) pieces were routinely dried
overnight in an electric kiln on low.
Laua Conley
centa uhalde wrote:
> ----------------------------Original message----------------------------
> Hi,
> I was wondering if stuff that is not bone dry but just beyond the leather
> hard stage can be candled for some period of time (?) before proceeding
> with a firing schedule. ??
>
> Thanks as usual,
> Centa
Ron Roy on mon 22 jun 98
There is an easy way to "see" if there is any atmospheric water left in the
kiln. Open the top spy hole and hold something shiny so that the flow of
air from inside the kiln flows across the surface - piece of stainless
steel works - so does a mirror - if there is still H2O present it will
condense on the cooler surface.
>> ----------------------------Original message----------------------------
>> Hi,
>> I was wondering if stuff that is not bone dry but just beyond the leather
>> hard stage can be candled for some period of time (?) before proceeding
>> with a firing schedule. ??
>> Thanks as usual,
>> Centa
>YES - keep temperature low, below 100degC -How long for?
>Depends on how wet, how thick etc., Do it for how long you think is
>right and then for a few hours more! If you start increasing the heat
>too soon the pots will explode!
Ron Roy
93 Pegasus Trail
Scarborough, Ontario
Canada M1G 3N8
Tel: 416-439-2621
Fax: 416-438-7849
Web page: http://digitalfire.com/education/people/ronroy.htm
PMFox on mon 22 jun 98
centa:
I recently 'forced' a few loads of work through in order to have wares
available to sell at a show. Many pieces were put in the kiln
(electric) the day after throwing- still dark and damp. I fired very
very slow- overnight bottom knob only on low, kiln open; 1/2 day bottom
low, kiln closed, etc. total firing time about 30 hours. Only a couple
fractures.. worth the risk for me.
Patti
centa uhalde wrote:
>
> ----------------------------Original message----------------------------
> Hi,
> I was wondering if stuff that is not bone dry but just beyond the leather
> hard stage can be candled for some period of time (?) before proceeding
> with a firing schedule. ??
>
> Thanks as usual,
> Centa
Riff Fenton on tue 23 jun 98
If I have any doubts about whether or not a piece is dry
enough to bisque, I will hold it's bottom against a piece of
glass (I have a north facing window) for 30 seconds or so.
If there is moisture or condensation on the glass when I
remove the piece, I know it isn't dry. This little test
has not betrayed me yet.
Riff
riff@bbs.slv.org
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