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Cracked bowls

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Cracked bowls

Postby Medpack » Sat May 27, 2017 8:44 am

I have recently been having problems with slumping bowls. They all are cracking. Using Wismach
90 circles with bullseye pieces fused to them. During slumping into bowl they all crack. Using skutt kiln with medium fuse schedule for fusing and slow slumping program. This has happened 3-4 times now on different pieces. Attached are photos.
Attachments
crack.jpg
final piece
crack.jpg (94.27 KiB) Viewed 16226 times
crack 2.jpg
slumping bowl
crack 2.jpg (80.7 KiB) Viewed 16226 times
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Re: Cracked bowls

Postby marykaynitchie » Tue May 30, 2017 8:26 am

How distressing! Unfortunately, all firing cycles don't work with all glasses. Also, at Bullseye, we have no experience with Wissmach 90 so whether or not it is actually compatible with Bullseye is a question.

Can you find out the actual firing cycle and post it here?

You might find this video helpful: https://videos.bullseyeglass.com/videos ... -it-break/

Mary Kay
Mary Kay Nitchie
Bullseye Glass Co.

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Re: Cracked bowls

Postby marykaynitchie » Tue May 30, 2017 8:27 am

Here are the other questions we have for you that might help us pinpoint the issue:

viewtopic.php?f=14&t=4553

Mary Kay
Mary Kay Nitchie
Bullseye Glass Co.

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bit.ly/BullVideos
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Re: Cracked bowls

Postby jestersbaubles » Wed May 31, 2017 5:02 pm

Ditch the canned programs and learn to properly create a firing schedule for the project at hand. As Mary Kay points out, it's not a "one size fits all" when it comes to firing glass. Controller manufacturers should be bonked on the head for ever adding built-in schedules :mrgreen:

That being said :) ... I have read quite a few anecdotal comments lately of people having compatibility problems with Wissmach & Bullseye glass. You might be safer not mixing the two.

Personally, I really dislike how brittle Wissmach is when it is cut, and how thin the opals are. I would prefer to pay a little more for a better quality product (even if I do use System 96 :twisted: )

Dana W.
Dana Worley Fused Glass Designs
dba Jester's Baubles
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