Totally WEIRD slump
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Totally WEIRD slump
Made a round disk - 3/8" thick and used white, cranberry red, clear and a streaky red/white. Fused flat very nicely, cold worked the edges. During the slump it sort of misshaped (wish I could post a photo!). Instead of being round, it's kind of wavy on the edges. I've had slumps that went down off-center, but never wavy on the edges! And the waves are symetrical. Here's the schedule:
150 > 350 30 min
200 > 1000 0 min
400 > 1250 10 min
9999 > 960 120 min
100 > 740 0 min
300 > room temp
Any ideas?????
150 > 350 30 min
200 > 1000 0 min
400 > 1250 10 min
9999 > 960 120 min
100 > 740 0 min
300 > room temp
Any ideas?????
Greg
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does the back of the bowl contact the mold everywhere? perhaps it wasn't at slumping temps enough time or high enough.
could it have hung up on something as it was slumping? i usually put a very slight bevel on the outside down edge of a blank so that it will slide better as it's going down the mold side.
what material is the mold? if steel, have you used it before? it could have warped at temp, and unwarped when it cooled. the glass would then have taken the shape of the warp.
could it have hung up on something as it was slumping? i usually put a very slight bevel on the outside down edge of a blank so that it will slide better as it's going down the mold side.
what material is the mold? if steel, have you used it before? it could have warped at temp, and unwarped when it cooled. the glass would then have taken the shape of the warp.
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Greg
If I understand your schedule, perhaps you are heating too fast up to slump temp from 1000 and not soaking there long enough for the glass to relax in to shape.
Using float glass, I sometimes get a lot more "wrinkling" I like this effect and sometimes encourage it.
If I understand your schedule, perhaps you are heating too fast up to slump temp from 1000 and not soaking there long enough for the glass to relax in to shape.
Using float glass, I sometimes get a lot more "wrinkling" I like this effect and sometimes encourage it.
Bert
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Bert Weiss Art Glass*
http://www.customartglass.com
Furniture Lighting Sculpture Tableware
Architectural Commissions
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I agree with Bert about the rate of firing above 1000. Just a little fast and the slump temperatue is a little high. Combine the fast heat and high slump temp and edges of the bowl that are near the elements will get soft first and start to sink before the rest of the piece.
I wouldn't think you'd need to go over 1175 with a 20 min soak for a piece this big, guessing 14-16 inches in diameter.
Ron
I wouldn't think you'd need to go over 1175 with a 20 min soak for a piece this big, guessing 14-16 inches in diameter.
Ron
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