Not all molds that make great slumping molds are pre-drilled because they were designed to be used for ceramics. You can drill holes in the molds that would be suitable for slumping. Be sure you examine the mold for crevices and areas that would keep you from removing your glass without breakage.
Holes should be drilled in bisque to allow air to release while the glass is slumping. It is recommended to use a 1/8” or 3/16” Carbide Tip Drill Bit when drilling bisque for slumping. To avoid cracking or uneven slumping it is important to drill holes in any bisque piece that you use to slump glass.
TO DRILL: Position the holes evenly on the surface of the bisque. The number of holes to drill depends on the size of the piece. Also, if the bisque piece has a foot, you may want to file the foot in several places to create an air channel to help air escape from under the glass.
So, how many holes should you drill? This chart is a guideline to help you decide:
Holes should be drilled in bisque to allow air to release while the glass is slumping. It is recommended to use a 1/8” or 3/16” Carbide Tip Drill Bit when drilling bisque for slumping. To avoid cracking or uneven slumping it is important to drill holes in any bisque piece that you use to slump glass.
TO DRILL: Position the holes evenly on the surface of the bisque. The number of holes to drill depends on the size of the piece. Also, if the bisque piece has a foot, you may want to file the foot in several places to create an air channel to help air escape from under the glass.
So, how many holes should you drill? This chart is a guideline to help you decide:
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