Cracked Kiln Shelf
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- This topic has 5 replies, 3 voices, and was last updated 10 years, 8 months ago by
bhawbaker.
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- October 15, 2011 at 7:14 pm #9691
Saturations
ParticipantI recently did a long thick pot melt with great success on the glass, but my shelf cracked during cool down. any idea why that would be??
October 16, 2011 at 2:20 am #12255Anonymous
InactiveSorry to hear that.
If none of the glass stuck to the shelf it was probably thermal shock.
What kind of kiln and what was the schedule?
Paul
FusedGlass.Org
Helios Kiln Glass Studio
PaulTarlow.comOctober 22, 2011 at 5:50 pm #12256Saturations
Participant1000 1000 15 min
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1000 1700 90 min
9999 1500 45 min
9999 950 180 min
12 800 15 min
24 700 10 min
120 100 0 min
October 22, 2011 at 6:36 pm #12257Anonymous
InactiveA couple more questions:
1) Did the glass break too – or just the kiln shelf?
2) How do you know it broke on the way down?
3) Were you firing right on the shelf – or fiber board/fiber paper?
Paul
Paul
FusedGlass.Org
Helios Kiln Glass Studio
PaulTarlow.comOctober 22, 2011 at 6:56 pm #12258Saturations
Participant
The glass did not have any sign of the cracked shelf under it – no creases etc. I was using shelf paper 1/16″ under the glass and around the stainless molds. I assume it cracked on the way down because there was no healed marks on the bottom of the glass. I did discover a crack forming on the 6×6 piece but not the other one after a few days.I may have been aggressive taking the glass out of the the stainless dam (which I did in the kiln and on the shelf).
The shelf was thinner than most (I got it second hand – made in taiwan with riddges on the bottom).
November 1, 2011 at 2:11 am #12259bhawbaker
ParticipantSame thing happened to me doing the kiln pressed glass project. I normally have the shelf on 1/2 inch posts to even the heating, and I should have put the shelf directly on the kiln floor.
But all is not lost! I just cut up the broken shelf with a tile saw (using the tile blade) into 1″ strips to use as dams, holders for screen melts, etc.
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