shane mickey on mon 21 apr 08
i just posted about this then read vinces last entry, one questions, if =
the heat does build up to the critical level
what is to stop the cement board from poping? also even if the block are =
facing upright wouldnt the edges pop
just like anyother concrete? seems like no matter which way they face if =
heat does build up, BOOOM! i have
to admit i thought mels idea of expanded metal to be silly but it is a =
small barrier of non explodable material that lets air escape. fiber =
board i am not sold on either as it would likely crush and degrade after =
awhile.
just an extra 2 cents
shane mickey
kiln building and design services
gary navarre on mon 21 apr 08
Geeze folks, just about the time I get useta the idea
I might be wrong in floating my kiln on a deep layer
of free rocks and gravel...
I am starting to wonder if the heat work under the
4.5" of hard brick will over time calcine the granite
chips into a mix of feldspar/mica/quartz "sand". Or if
the bottom gets real hot like it did last kiln might
some of the feldspar melt and the kiln starts sinking
into the gravel foundation. That's all I need is for
the damn thing to slide downhill away from the stack
on a feldspar slick. Maybe I should weld some angle
iron straps to pylons in the ground near the house and
around the front of the firebox. I remember the slow
damage to the cement block under the last kiln after
20 firings and this next kiln will be three times the
size so that much more heat will be absorbed by gravel
under the larger floor. It might not explode but it
could implode.
--- shane mickey wrote:
> i just posted about this then read vinces last
> entry, one questions, if the heat does build up to
> the critical level
> what is to stop the cement board from poping? also
> even if the block are facing upright wouldnt the
> edges pop
> just like anyother concrete? seems like no matter
> which way they face if heat does build up, BOOOM! i
> have
> to admit i thought mels idea of expanded metal to be
> silly but it is a small barrier of non explodable
> material that lets air escape. fiber board i am not
> sold on either as it would likely crush and degrade
> after awhile.
> just an extra 2 cents
> shane mickey
> kiln building and design services
Ya know I coulda been done with this if I'da just
leveled off the ground and set the brick on the
sand/clay/dirt or no floor at all like the old kilns,
just walls and a fire!!! I guess a man convinced
against his will is of the same opinion still. Maybe
one of these days I'll become teachable. I just got
off on the wrong feet believing in some of the stuff
written by Cardew, Leach, Watts, Leary, and Yogananda.
Stay in there eh!!!
Gary Navarre
Navarre Pottery
Navarre Enterprises
Norway, Michigan, USA
http://public.fotki.com/GindaUP/
http://www.youtube.com/GindaUP
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Hank Murrow on tue 22 apr 08
On Apr 21, 2008, at 2:53 PM, gary navarre wrote:
> Geeze folks, just about the time I get useta the idea
> I might be wrong in floating my kiln on a deep layer
> of free rocks and gravel...
>
> I am starting to wonder if the heat work under the
> 4.5" of hard brick will over time calcine the granite
> chips into a mix of feldspar/mica/quartz "sand". Or if
> the bottom gets real hot like it did last kiln might
> some of the feldspar melt and the kiln starts sinking
> into the gravel foundation. That's all I need is for
> the damn thing to slide downhill away from the stack
> on a feldspar slick. Maybe I should weld some angle
> iron straps to pylons in the ground near the house and
> around the front of the firebox. I remember the slow
> damage to the cement block under the last kiln after
> 20 firings and this next kiln will be three times the
> size so that much more heat will be absorbed by gravel
> under the larger floor. It might not explode but it
> could implode.
Dear Gary;
You will not create enough heat below 4.5" of brick to melt the
feldspar gravel.
Rest easy, Hank
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