I didn’t take much of a break after the Craft Fair last weekend. I slumped a bowl a few weeks ago into a new mold that had steep sides. After slumping it, the rim of the bowl was uneven. I went to my favorite source for information about all things to do with fusing glass: www.warmglass.com
I found a “Warm Tips” as they are called–just a short blurb about a topic of interest. They come out every once in awhile. Here is the link to the exact page I am referring to: http://www.warmtips.com/20051223.htm.
It says to make sure your kiln is level, as well as the kiln shelf and even the mold.
All molds for slumping bowls and plates, etc, need to have a couple of holes drilled in the bottom of the mold. The holes allow air and gas to escape from under the glass as it is being fired. If you don’t have holes drilled or if they are plugged up with kiln wash, you will get a bubble in your glass.
The next tip is to let fire slowly and at 1100 degrees, let it soak there for awhile. This will help the glass slump more evenly. Don’t fire the kiln higher than it needs to go. This may also cause an uneven edge. Slowly raise the temperature to around 1250 degrees and let it soak, but not for very long. The longer you soak it, the more chance you will get an uneven edge.
So today, I slumped the bowl flat on the shelf. It isn’t perfectly round, so I will need to do some grinding. After that, I will try again to slump the glass in my mold. Now I have good information about how to do it better.
I’ll let you know how it turns out.
Check out my Fused Glass Creations!
Check out my other Glass Blog!