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slumping with fibre

For discussion of processes related to using Bullseye glass, including kilnforming and kilncasting, torchwork, blowing and stained glass.

slumping with fibre

Postby dr sawfish » Tue Mar 23, 2010 3:12 pm

i have tried to slump 2 large 40cm x 40cm platters on 1 inch thick fibre paper but they have both cracked during the heat up phase, is this becuase there is cool air trapped underneath?if i had a shelf full of small holes would this work?
dr sawfish
 
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Joined: Sun Jan 31, 2010 5:29 am

Re: slumping with fibre

Postby marykaynitchie » Tue Mar 23, 2010 3:31 pm

Dear Dr. Sawfish,

Sorry your pieces have not been successful so far! We cannot provide useful advice without more information from you.

Please tell us:
1. Which specific glass styles you used
2. Kiln size
3. Where the elements are located in relationship to your piece
4. Whether the fiber blanket was on a shelf or on the floor of the kiln
5. What the shelf material is (if you used a shelf)
6. The complete firing cycle. Include the number of segments, and the rate, temperature and hold time for each segment.
7. Characteristics of the break. Straight or curvilinear? Sharp edges or soft edges?

After we know a little more about your project, members and techs will probably be able to help.

Thanks!

Mary Kay
Mary Kay Nitchie
Bullseye Glass Co.

Subscribe to Bullseye kiln-glass videos at
bit.ly/BullVideos
marykaynitchie
 
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Re: slumping with fibre

Postby dr sawfish » Thu Mar 25, 2010 10:09 pm

1. bullseye glass
2.interior size 60 x 60 x 30 cm
3.roof
4.shelf
5.mullite clay
6.normal slump firing shcedule(worked many times but not with fibre)piece was 45 x 45 cm glass 6mm
7.break is straight line across corner,happened during heat up as break edges are rounded
8.large air area trapped inside fibre cavity.i am sure this is what caused it
dr sawfish
 
Posts: 61
Joined: Sun Jan 31, 2010 5:29 am

Re: slumping with fibre

Postby marykaynitchie » Fri Mar 26, 2010 4:40 pm

Hi Dr. Sawfish,

It looks like you know what happened, so I won't ask you any more questions. For now.

Mary Kay
Mary Kay Nitchie
Bullseye Glass Co.

Subscribe to Bullseye kiln-glass videos at
bit.ly/BullVideos
marykaynitchie
 
Posts: 1205
Joined: Thu Oct 13, 2011 5:39 am


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