ClayArt Moderator on mon 27 jul 98
The note about grinding kiln wash off shelves brought to mind these two
suggestions:
- use Masonry grinding disks with your grinder, these work MUCH better than
the ones meant for steel. They're available for almost all sizes of high
speed side (body) grinders. They also grind glaze better, and work quite
well to take off glaze runs from pots.
- ALWAYS wear a dust mask certified for dusts and mists, and EYE
protection. And do this in a place where you won't bother your neighbors or
create other dust hazards.
Richard
Richard Burkett - School of Art, SDSU, San Diego, CA 92182-4805
E-mail: richard.burkett@sdsu.edu <-> Voice mail: (619) 594-6201
Home Page: http://rohan.sdsu.edu/dept/rburkett/www/burkett.html
CeramicsWeb: http://art.sdsu.edu/ceramicsweb/
HyperGlaze@aol.com & http://members.aol.com/hyperglaze/
Sarah Barnes on tue 28 jul 98
Another option where available is to sandblast the shelves. If done
quickly it will take off slat, glaze, kiln wash etc with much less
hassle. We have a sculpture deparmtne at school where I can do this but
memorial (gravestone) shops can also do this for a small fee. You need to
wear dust mask, gloves, goggles, realshoes etc. I do this once a semester
and then flip the shelves and ust the opposite side.
Sarah
Sbarnes@mica.edu
Timothy Dean Malm on thu 30 jul 98
Sandblasting is an option but let me suggest that if you use this option
have only one shelf done,evaluate the job and then decide if this option
is reallya good one. It only takes a few moments of industrial blasting to
create indentations on the surface of yourexpensive shelves.Finally
something on clayart which I have firsthand knowledge of. Sincerely
Tim Malm
John Tilton on thu 30 jul 98
I agree with David-- take the shelves and have them sandblasted. I take
mine to a monument company--- where they do gravestones. But be sure to
watch carefully. A large sandblaster can really eat up a SiC shelf. You
will want them to use a fine sand. You will have to find someone who is
sensitive enough to just remove the glaze and kiln wash. These people
are in short supply in my area.
John
--
John Tilton
16211 NW 88th Terrace
Alachua, Fl. 32615
904-462-3762
Web site: http://www.tiltonpottery.com
Peter Pinnell on fri 31 jul 98
About 10 years ago I spent a great deal of time with a potter who had a
terrible problem with pinholing. The pinholes occurred in many
different glazes, in different parts of the kiln, on different clay
bodies, and seemingly at random. To make a long story short, it turned
out to be caused by his shelves. He had sandblasted his old silicon
carbide shelves, and afterward they dropped little specks of SiC onto the
glaze of whatever was stacked below. He was the one who made the
connection, not me. He noticed that he had no pinholes below his new
Thorley shelves, and lots of them under the old SiC's. Perhaps he
sandblasted too deeply, or his shelves were not of the best quality, but
I would think twice (or at least test a shelf) before I did it to the
whole bunch.
Pete Pinnell, who wishes he got to read ClayArt every day rather than
once a week.
Nils Lou on sat 1 aug 98
This problem (pinholing) can be prevented by applying a coating of ITC100
(spray or brush) on ALL sides of your kiln shelves.
In fact, cheaper cordereite shelves rated to cone 6 will be upgraded to
cone 10 shelves and the added plus is no kiln wash will be needed.
Nils Lou
On Fri, 31 Jul 1998, Peter Pinnell wrote:
> ----------------------------Original message----------------------------
> About 10 years ago I spent a great deal of time with a potter who had a
> terrible problem with pinholing. The pinholes occurred in many
> different glazes, in different parts of the kiln, on different clay
> bodies, and seemingly at random. To make a long story short, it turned
> out to be caused by his shelves. He had sandblasted his old silicon
> carbide shelves, and afterward they dropped little specks of SiC onto the
> glaze of whatever was stacked below. He was the one who made the
> connection, not me. He noticed that he had no pinholes below his new
> Thorley shelves, and lots of them under the old SiC's. Perhaps he
> sandblasted too deeply, or his shelves were not of the best quality, but
> I would think twice (or at least test a shelf) before I did it to the
> whole bunch.
>
> Pete Pinnell, who wishes he got to read ClayArt every day rather than
> once a week.
>
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