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Get the biggest one. I can't find the picture of a Kalamazoo, but I have a Bee from CRL that works fine.

Hang a weighted plumb line from the top of the kiln somewhere convenient- mark the center of your mold, place that under the plumb, mark the center of the glass, place that under the plumb line- should be good to go.

Did you try to cold work the flat spot with with a grinder or abrasive pad? Are you slumping the flat spot on the bottom of your mold or balancing a tile on top while you slump? Ceramic tile is inert, use kiln wash.

Did this work out? Now some time has passed, just wondering.

I agree with Bert, soap is likely to cause contamination issues. Heat your bowl of frit- fast as you can is fine, -up to 450 hold 15 or 20 minutes- done. Yes, you could heat it in the oven if your kiln is too small or in use.

Thanks for the heads up on this technique for stacking layers.

Thanks for the reference, Michelle. I enjoyed reading the Tech Notes. There are more big glass kilns than ever, and big kiln shelves. I hope you are happily making lovely giant glass pieces on the new shelf.

Do I understand the fiber board is only 6 mm thick? You are rigidizing it and then coating with some cement? What is a cement that makes such thin fiber into a board that will stand up to fusing? I have had some serious sticking on rigidized board but never made a cement coating.

I made a bunch of cereal bowls from both Bullseye and Spectrum glass. I have used them daily and washed them in the dishwasher for months with no issues. I wouldn't microwave them, though. Like Bert said- uneven heat.

Sand off all the discolored area from where the pin was embedded, add a little frit and refire to full fuse. White is hard to repair, there may be a mark there from the additional glass. Refusing could soften your design lines, or look at it as a chance to add more elements to the piece and make it ...

You only have 1/2 inch to the kiln wall and the elements, can you make the glass design smaller? You risk a lot from glass on the elements and uneven heating and annealing, even if the sand doesn't get in the element grooves.

Forty pounds of glass and 20 inch diameter? Sounds like you should do some smaller tests of the plan first. Opening a kiln at 1600 degrees with pounds of glass is asking for burns, too, not to mention searing your arms and eyes.

Torch on it! Great Idea!

Heat it in your kiln to 550-turn off kiln, pull the hot mold out carefully with pliers. Lay it on a drop cloth that won't burn or melt to catch overspray. a couple wood or kiln brick bits will raise the mold off the surface. Spray on Bullseye kilnwash with a hand held spray bottle with a fine mist. ...

I used one for a while that was hooked to a water hose so the ground glass washed into a big settling bowl. There isn't a cloud of dust because of the water. You can dry the frit in the kiln. It worked fairly well for at least 100 pounds of glass before the blades wore down. There is a lot of that m...

Dura board and fiber board are the same thing, aren't they? Real soft- and like foam. Shape them with a spoon?

You want to cut some really thick glass- how about a tile saw? Bandsaws for glass are good for 1/4 inch, maybe.