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Hello I have recently acquired a small kiln for use at home (Hobbytech 40). It works and I’m happy with it for the most part, but when I have bisque fired plates, they crack during firing, down the middle to about halfway across the plate. This must be a fault when I’m making the items. Can anyone tell me what could be causing this so that I don’t waste efforts making anymore to be disappointed when they’re fired? I’ve not had this happen with plates I’ve made in my ceramic lessons. Some are wheel thrown, some are made from slabs. Clay bodies used are lavafleck stoneware, or white special stoneware. Are these plates now only good for the bin? Photos attached.
HI All, I am currently helping with a just starting out Art Gallery and Community art center. I have worked in community studios for quite a few years and have helped a similar style studio start their ceramics room/department. My concern is that The Owners were gifted a kiln that is a VERY OLD manual electric Duncan - I heard somewhere that the year is in the serial number; if true the kiln is from 1964 . The kiln is in pretty bad shape. The electrical and the heating elements don't look too bad, but the floor and the lid are in really bad shape. The floor is crumbling, the edges of on the outside are rusted, the brick/board on the lid is cracked, and it just looks rough. I have told the owner, his wife, the Gallery Director; anyone, that will listen, that I am not comfortable firing it with how rough this kiln looks to be. The Owner had his friend, who seems to know a great deal about kilns, to look at it. The friend is suggesting repairing it by pouring, a concrete-like, floor and just tightening the lid. He said he could rerun the heating elements as well. This is beyond my knowledge, and if it was my center I would just buy a new kiln. They have invested a great deal of money into the space. I have offered a huge amount of free knowledge and experience to help get this up and running but am not financially contributing. The Owner doesn't seem to be interested in investing in a new kiln. My gut is telling me not to fire the kiln. . . but I am a very cautious person naturally . . . Am I worried about nothing? How old and how damaged is too damaged? Thank you for any help or insight you have.