Hi all -
I have a stainless steel slump mold that I made. It is flat, round piece of 14 gauge stainless steel with my shape cut out - I use stands under it to allow the glass to drape through it.
The first time I used it (sprayed it with BN) in my smaller bonnie glow kiln it worked perfectly - I had fused a color and a clear piece to make a 6mm thick flat piece to drape. Then slumped that into the stainless steel drape mold.
Since I made the first one - I have acquired another kiln - its a 220v 24" round kiln - I have tried the same mold using the same parameters and the glass cracks each time (I've tried this twice) The glass cracks right at the edge where it is draping down.
SO -- any wisdom on how to adjust this? Is this cracking on the cooling (my assumption) since both times the slumping is working quite well - it is just ending up cracking. The bonnie glow kiln is fiber and heats and cools faster (I believe) The reason I was trying the bigger kiln is that I would like to make some bigger pieces and was trying to master this process!
Both kilns are equipped with TAP controllers - and the draping programs are the same.
Hopefully one of you has conquered this!
Thanks in advance