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Showing results for tags 'Glaze firing'.
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elaine clapper posted a topic in Studio Operations and Making WorkI have a question on "holding" time with an electric kiln. One of the glazes I use fires matte at cone 5 and glossy at cone 6. I would like something just slightly more cone 5. If I set the kiln for cone 5 and set it hold for an hour at the peak temperature, will I get a slight temperature increase? hold it for more? less?
cmdutcher posted a topic in Equipment Use and RepairMy kiln is an Econo j236 from the late 80s or maybe 90s. Cone 6 electric kiln. I'm the 3rd owner of it and don't really know the history of it as to parts being replaced etc. It seems like every single glaze firing, I end up with these tiny specks of something ruining my big bowls. They're raised and sharp to the touch. I'm wondering if it's from the fire brick? However the lid has no cracks whatsoever and seems to be in good shape. There are a couple slightly broken bricks in the sides, but would that get inside a bowl? Some of my shelves are also broken (this is really starting to make it sound like a piece of garbage, but this is not from me) so I'm wondering if the specks could be coming off there? We used broken shelves at college regularly without a problem to my knowledge. Anyone know how to fix this? Or is it a matter of replacing things? Thank you in advance!
Anyone advise me on the advisability/dangers to fast firing of cone 6 oxidation glazes? I don't mean soak or hold times, just how quickly I bring the kiln up to temp. What little training I ever received in firing only differentiated bisque and glaze firings by the desired temp or cone, not the length of the firing. So I've always ramped up slowly, bisque or glaze. My consideration here is not just time, but the expense of lengthy firings. If I can shave a few hours off a glaze firing without compromising my results, then it just makes sense. Any advise much much appreciated.
I had a relay fail during a Cone 5 glaze firing. The temp reached 1800 degrees and fired 10 and a half hours. The glazes were under fired and looked chalky but they do not come off. I have replaced the bad relay and my question is: do I re-glaze before re-firing, just re-fire, or do I just throw the stuff away?