Circles from Squares

Courtesy of Bullseye Glass

These beautiful cabochons were made from square pieces of glass.

You can create nicely rounded cabochons from stacks of 0.75(20 x 20 mm) squares, thanks to heat, gravity, and the 6 Millimeter Rule. But be careful…they’re addictive!

Some Design Layer Possibilities

  • Blue/Vanilla part sheet: Scatter Steel Blue Opalescent coarse frit (000146-0003) onto a base of 3-mm Clear sheet glass, then sift a heavy layer of French Vanilla powder (000137-0008) over the top to cover. Fire to a full fuse. Maximize depth by arranging the Clear side toward the top of the stack.

 

  • River Rock Reaction (See Quick Tip: River Rock Reaction)

 

  • Pieces of Citronelle Opalescent (000221-0030) and

 

  • Turquoise Blue Opalescent (000116-0030).

 

The Stack

Top (6 mm): A “lensing” layer of Clear. This layer will stretch considerably. 

Middle (3-4 mm): This “design” layer will stretch and be visible through the top layer. Use part sheets or pieces of 3-mm sheet glass.

Bottom (6 mm): Typically not visible from the front. This layer will stretch the least. 

Tips

  • 6-mm Tekta Clear is a natural for this project. It’s more efficient, with fewer pieces to cut, clean and assemble!

 

  • Measure and score a grid of 0.75″ squares, then run them using the Rule of Halves. Two layers of 3 mm will also work.

 

  • A dab of GlasTac Gel will keep the stack together before firing.

 

  • The stacks flow out to about 1.25″ (32 mm) in diameter, so give them room.

 

  • For the cleanest release, we recommend firing on ThinFire.

 

Cabochon Firing Schedule

 

Rate Temperature Hold

 

1 400°F (222°C) 1225°F (662°C) :30

2 600°F (333°C) 1525°F (829°C) :30

3 AFAP 900°F (482°C) 1:00

4 100°F (56°C) 700°F (371°C) :00

5 AFAP 70°F (21°C) :00

 

Note: This heatwork goes beyond what the glass is tested for. Some styles

may opalize and/or shift in compatibility. Test before making multiples.

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