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bciskepottery

Member Since 28 Jun 2010
Offline Last Active Jul 23 2014 10:31 PM
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Posts I've Made

In Topic: What Are You Working On?

23 July 2014 - 10:21 PM

Just finished group of vases for upcoming salt firing. More wares still need to be prepared, though.

In Topic: 10 Cool Trends In Contemporary Ceramics

20 July 2014 - 08:57 PM

http://smokieclennel...n-of-craft.html

The first sentence seems to sum it up.

In Topic: Peep Hole Plug Recipe

20 July 2014 - 08:54 PM

http://community.cer...peep-hole-plug/

In Topic: Shelf Grinding

20 July 2014 - 08:46 PM

Would you like eggs and toast with your links?

Would not recommend the diamond pads . . . you'll eat through a ton of them. We just cleaned 21 shelves from a salt firing . . . used carbide grinding stones, stiff putty knives, chisel with hand protector; so serious glaze runs so the angle grinder stayed at the workbench. For small glaze drops, a flat-headed screwdriver and hammer work. You just need to learn how to angle the knife/screwdriver/chisel so that you catch under the lip of the glaze bead. For bad glaze runs, grinder.

And, in all situations . . . wear your respirator, eye protection, and work gloves (no cheap cloth gloves); slivers of glaze can cause serious cuts. And never run your bare hand over the kiln shelf to see if there are any glaze spots that need removal.

In Topic: Breakage

20 July 2014 - 08:38 PM

For future firings, you might want to think about clay slats between tiles and between the kiln shelf and the bottom tile of the stack. A quarter inch thick slat, maybe an inch or so wide should do, in various lengths. Slats, or coils, would allow for air circulation during cooling. It would also minimize the chance for the tile to snag on uneven kiln wash or other tiles while the tiles expand/contract during firing.

Also think about carving out portions of the reverse side of your tiles; again, that would give you air pockets that will help on cooling, etc. From your picture, it appears the tiles are solid.

At least for the tile in the picture, which I am guessing was the top tile on the top shelf, my inclination is to think uneven cooling -- with the outer edges and sides cooling faster than the middle/core (which was also retaining heat from the tile underneath. As for the middle stack, I think too much heat retention from a too dense stack. Just give them some air in between.