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Ball Surface Mold - 20”

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Ball Surface Mold - 20”

Postby Candykahn » Tue May 15, 2018 6:41 am

I followed the recommended slumping schedule for this particular mold in my GL-24. When I removed the glass bowl it seems to rock a little. Does this mean it didn’t drop all the way to the surface of the mold? Should glass slumped in this mold have a little bit of a flat bottom so that the glass bowl will be steady?

Candace Kahn
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Re: Ball Surface Mold - 20”

Postby marykaynitchie » Wed May 16, 2018 8:44 am

Hi Candace,

The Ball molds do not have a flat base, because they are based on a perfect sphere. My work-around is to make a base "accessory". Put a smooth piece of aluminum foil in the bottom of the cold mold as a plaster release. Then pour in a little plaster until the round puddle of plaster is the diameter you want. (You can make a lot of these, as they don't survive many slump firings.) After the plaster sets REMOVE THE ALUMINUM FOIL and let the plaster completely dry. Then coat the flat surface with shelf primer and dry.

When you are ready to slump, put the plaster base accessory back in your mold.

The solution that other people use is to design exterior bases or feet, which stabilize and elevate the bowl.

Mary Kay
Mary Kay Nitchie
Bullseye Glass Co.

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Re: Ball Surface Mold - 20”

Postby jestersbaubles » Sun May 20, 2018 4:38 am

What a great idea, Mary Kay!

If the bowl is decorative, I have used acrylic 3" rings that are made for holding basketballs. You can find them on amazon (usually six to a pack). This holds the bowl fairly stable and gets it up off the table-top so that light can better pass through the glass, without a stand intruding on your design.

Best, Dana W.
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