Bubble or "Tumor" Forming During Slump
Posted: Sat Sep 22, 2012 10:25 am
Good Morning All,
I am having an issue that I just cannot seem to correct. I've tried every variation I can think of, and nothing seems to be working. Here's the issue. I am taking a fully fused "blank" (Spectrum black with clear cap, fully fused, no problems) and putting it in your average 10" plate mold. Seems simple. Apparently not.
I ran it yesterday only to go out and find a giant "tumor", or whatever you want to call it, had formed on one side. No big deal, but this has now happened at least 4 times. I have tried every variation I can think of. The first time had a design element on it, so I thought that caused it. Took that out, still happened. Tried ramping up at different speeds thinking maybe I was going too fast, too slow. Still occurring. I am at my wits end. Now I don't know if there is something wrong with the mold or the kiln or if I am still just doing something obviously wrong. It wouldn't be so troubling if I hadn't run this same style of plate using the same mold a ton of times with no problems.
Here's all of the info I think you will need. I have a Jen Ken 15-6, coils on top and sides.
I am using Spectrum clear full fused over solid black.
I have put the 10 plate mold onto small kiln posts to make sure it has air circulation and that the hole in the bottom is completely clear.
My schedule this final time was...
400-1100-0
200-1250-20
AFAP-960-45
100-700-OFF
I have adjusted the second ramp (the 200) from AFAP to 800dph to 500dph to 200dph. For the most part the rest of the schedule has remained the same. I just don't know what to do any more. I've done other project in between these mishaps and everything else seems to be firing ok, as long as I'm not using this mold. I have checked out the mold and can't find anything that jumps out at me as causing the problem. I think the first time it happened I may have just primed it, but I haven't since. Any suggestions would be EXTREMELY appreciated, as I am about to lose my mind.
I am having an issue that I just cannot seem to correct. I've tried every variation I can think of, and nothing seems to be working. Here's the issue. I am taking a fully fused "blank" (Spectrum black with clear cap, fully fused, no problems) and putting it in your average 10" plate mold. Seems simple. Apparently not.
I ran it yesterday only to go out and find a giant "tumor", or whatever you want to call it, had formed on one side. No big deal, but this has now happened at least 4 times. I have tried every variation I can think of. The first time had a design element on it, so I thought that caused it. Took that out, still happened. Tried ramping up at different speeds thinking maybe I was going too fast, too slow. Still occurring. I am at my wits end. Now I don't know if there is something wrong with the mold or the kiln or if I am still just doing something obviously wrong. It wouldn't be so troubling if I hadn't run this same style of plate using the same mold a ton of times with no problems.
Here's all of the info I think you will need. I have a Jen Ken 15-6, coils on top and sides.
I am using Spectrum clear full fused over solid black.
I have put the 10 plate mold onto small kiln posts to make sure it has air circulation and that the hole in the bottom is completely clear.
My schedule this final time was...
400-1100-0
200-1250-20
AFAP-960-45
100-700-OFF
I have adjusted the second ramp (the 200) from AFAP to 800dph to 500dph to 200dph. For the most part the rest of the schedule has remained the same. I just don't know what to do any more. I've done other project in between these mishaps and everything else seems to be firing ok, as long as I'm not using this mold. I have checked out the mold and can't find anything that jumps out at me as causing the problem. I think the first time it happened I may have just primed it, but I haven't since. Any suggestions would be EXTREMELY appreciated, as I am about to lose my mind.