L&L Kiln Mfg on wed 6 jan 99
Large kiln shelves will crack and warp. If you are having a problem with
this you might try having them cut by a masonary contractor with a diamond
saw. It only takes a few minutes and a diamond saw goes through the ceramic
shelves like butter. If you are lucky enough to have silicon carbide
shelves you probably won't have a problem with cracking anyway but in any
case you can forget about cutting these. We've tried everything to cut
silicon carbide.
Stephen Lewicki
President
L&L Kiln Mfg Inc.
Phone: (610) 558-3899
Fax: (610) 558-3698
Email: steve@hotkilns.com
Don & Isao Morrill on thu 7 jan 99
At 09:54 1/6/99 EST, you wrote:
>----------------------------Original message----------------------------
>Large kiln shelves will crack and warp. If you are having a problem with
>this you might try having them cut by a masonary contractor with a diamond
>saw. It only takes a few minutes and a diamond saw goes through the ceramic
>shelves like butter. If you are lucky enough to have silicon carbide
>shelves you probably won't have a problem with cracking anyway but in any
>case you can forget about cutting these. We've tried everything to cut
>silicon carbide.
>Stephen Lewicki
>President
>L&L Kiln Mfg Inc.
>Phone: (610) 558-3899
>Fax: (610) 558-3698
>Email: steve@hotkilns.com
>
> We have cut silicon Carbide shelves in the following way: Place
the shelf on a good bed of dry sand,which takes-up the shock. Gently tap a
line across the shelf with a 4",broad masons chisel.A few taps lightly on
one side,then turn the shelf over and repeat. Most important is that the
taping sould be uniform throughout the process.
This works about 60% of the time. No guarantees. Don M.
At least one problem with attempting to cut these shelves with a
high-speed saw and water,is that as the groove is cut the weight of the
saw-blade compresses and hardens the bottom of the groove Each pass hardens
the groove.d.
Edouard Bastarache on thu 7 jan 99
Hello Stephen,
sorry to disagree, i have 30 silicon carbide shelves
and half of them have cracks.I support the cracks with
extra refractory stilts whenever necessary.
Later,
Edouard Bastarache
edouardb@sorel-tracy.qc.ca
http://www.sorel-tracy.qc.ca/~edouardb/
----------
> De : L&L Kiln Mfg
> A : CLAYART@LSV.UKY.EDU
> Objet : How to Cut Kiln Shelves
> Date : 6 janvier, 1999 09:54
>
> ----------------------------Original message----------------------------
> Large kiln shelves will crack and warp. If you are having a problem with
> this you might try having them cut by a masonary contractor with a
diamond
> saw. It only takes a few minutes and a diamond saw goes through the
ceramic
> shelves like butter. If you are lucky enough to have silicon carbide
> shelves you probably won't have a problem with cracking anyway but in any
> case you can forget about cutting these. We've tried everything to cut
> silicon carbide.
> Stephen Lewicki
> President
> L&L Kiln Mfg Inc.
> Phone: (610) 558-3899
> Fax: (610) 558-3698
> Email: steve@hotkilns.com
gwalker on fri 8 jan 99
I agree with you, Edouard,
I have never had any luck with silicon carbide shelves. I have had them
warp and crack. Hate the damn things, actually. Of course, they should
only be used in reduction firings, but even then I think they are a
pain! And so damned expensive! And heavy! I have also found them to have
very little thermal shock resistance, and they can't handle uneven
heating.
Bon chance,
Geoff.
http://www.cronulla-pot.com.au/
John K. Dellow on fri 8 jan 99
>
> > One way to stop cracks in silicon carbide shelves is to cut a nick (
> approx1/16") at the mid point on each side , i.e. 4 cuts. You will need to
> use a new dimond cutting disc.
Have seen this work in Australia & Japan.
John Dellow the flower pot man
Bob and Hulda on sat 9 jan 99
Dear Geoff,
I bought silicon carbide shelves from a U.K.
manufacturer,size 24inches x 24inches and these arrived with 4 cuts,each
6inches deep and 8 inches in from each corner.I have been using them for
years firing to cone 12 with a heavy reducing atmosphere and have had no
problems.
Regards,
Bob Hollis
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