Firepolishing, tack fuse and anneal - multitasking
Posted: Mon Feb 02, 2004 9:50 pm
I have two pieces that are at nearly the same stage in their lives. I wonder if I can do what I want to both of these pieces in the same firing.
One is 2 layers thick and about 8" x 8". I need to cold-work some edges, then fire-polish it.
The other is about 3/8" thick and about 12" x 12". I need to grind some edges AND put a layer of thin clear on top of the piece. I mis-annealed this piece in it's first firing (dammed, pattern bars, frit, on top of clear) and it has a crack in it. I don't think I went through the annealing range slow enough. I think I should go about 70F DPH from 960 to 750 instead of the 120 DPH drop I did at the first firing.
My questions:
Will the crack in the second piece heal at fire-polishing temps?
Can I fire both pieces at once to 1350 (both pieces are BE) and expect to both fire-polish one and fire-polish AND tack fuse the clear on the other?
I'm assuming that I should anneal at the slowest schedule - which would be that for the larger piece. Though I don't *think* that'll be an issue for a smaller, slightly thinner piece, I thought I'd ask you folks here.
Thanks all!
- Bev
One is 2 layers thick and about 8" x 8". I need to cold-work some edges, then fire-polish it.
The other is about 3/8" thick and about 12" x 12". I need to grind some edges AND put a layer of thin clear on top of the piece. I mis-annealed this piece in it's first firing (dammed, pattern bars, frit, on top of clear) and it has a crack in it. I don't think I went through the annealing range slow enough. I think I should go about 70F DPH from 960 to 750 instead of the 120 DPH drop I did at the first firing.
My questions:
Will the crack in the second piece heal at fire-polishing temps?
Can I fire both pieces at once to 1350 (both pieces are BE) and expect to both fire-polish one and fire-polish AND tack fuse the clear on the other?
I'm assuming that I should anneal at the slowest schedule - which would be that for the larger piece. Though I don't *think* that'll be an issue for a smaller, slightly thinner piece, I thought I'd ask you folks here.
Thanks all!
- Bev