huge bubble in full fused glass
Moderator: Brad Walker
huge bubble in full fused glass
I have over 900 firings in this kiln and lately the large pieces have developed a large bubble while doing a full fuse -- a schedule that has worked well for years. Could it be the coils, heat, what???? I'm anxious for suggestions. I can return it to the manufacturer for an overhaul if push comes to shove. Help!
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Re: huge bubble in full fused glass
shelf warped
Re: huge bubble in full fused glass
Might be a shelf warp, but a friend of mine experienced the same issue and has replaced her kilnshelf twice without relief. Check your kilnwash carefully.
Cynthia Morgan
Marketeer, Webbist, Glassist
http://www.morganica.com/bloggery
http://www.cynthiamorgan.com
"I wrote, therefore I was." (me)
Marketeer, Webbist, Glassist
http://www.morganica.com/bloggery
http://www.cynthiamorgan.com
"I wrote, therefore I was." (me)
Re: huge bubble in full fused glass
Interesting, never thought about the shelf or wash. I have two shelves but I haven't correlated whether it happens on a particular one. I have switched my brand of wash, that might be a factor. I'll try experimenting, just hate wasting the materials.
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Re: huge bubble in full fused glass
Hi Babs,
Take the glass piece with the bubble and lay it on a flat surface. Does the non bubbled part lie flat or does in lift on two corners or sides? If the glass is warped then the shelf may have warped during firing and the glass is recording the shape of the kiln shelf at elevated temperature. I had a similar problem and noticed that the glass itself was no longer flat after firing. I changed shelves and the problem stopped. I use the "rogue" shelf for tack fusing now.
Brad has a FAQ on the large bubbles... might be helpful.
Cheers,
Bob
Take the glass piece with the bubble and lay it on a flat surface. Does the non bubbled part lie flat or does in lift on two corners or sides? If the glass is warped then the shelf may have warped during firing and the glass is recording the shape of the kiln shelf at elevated temperature. I had a similar problem and noticed that the glass itself was no longer flat after firing. I changed shelves and the problem stopped. I use the "rogue" shelf for tack fusing now.
Brad has a FAQ on the large bubbles... might be helpful.
Cheers,
Bob
Re: huge bubble in full fused glass
Thanks. I'm on a mission to solve and will report back.