The shape is round. I’m trying to make a bowl. I’ve tried a 4-segment and an 8-segment firing schedule. The full fuse 4-seg. pgm is as follows:
300degrees/hr 1250 degrees 20 min.
600 1450 10
9999 960 60
100 700 1
I’ve tried different kinds of glass, both 96 COE and 90 COE. Firing with the 4 seg. pgm. I got two giant bubbles; with the 8-seg. I got only one. I’ve gotten the bubbles every time using large (12″) pieces, but never with smaller pieces.