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Callum Donovan-Grujicich

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  1. Thanks for the help. I need to use porcelain because it fires the whitest and I am mixing mason stains into the porcelain, so I want the colours to stand out as much as possible. Besides, I have already mixed about $200 worth of different mason stains into the porcelain clay. The idea of supporting the sculpture with stoneware was only a secondary thought. The stoneware contains grog, so would it help if I used it as an inner wall and as a support structure? With that being said, I do not want to add stoneware to the sculpture if that means the sculpture will likely crack, because the material costs of the sculpture are about $600 and I can’t afford to mess this up.
  2. Hello, I am working on a large sculpture, and in this sculpture I will be using coloured cone 6 porcelain to make a nerikomi pattern. The sculpture is a large hollow box, and I was thinking that I should add an internal support structure so the porcelain does not slump in the kiln. My question is this: because stoneware holds its shape better than porcelain, would it be possible to make the insides of the walls out of cone 6 stoneware and the outside out of the coloured cone 6 porcelain, and the internal support structure out of stoneware as well? My plan is for the walls to be 1cm thick, 5mm of porcelain and 5mm of stoneware. I have seen people mix stoneware with porcelain with no issues, does this also work for connecting slabs of the two different clays? I have attached a drawn diagram of what I am talking about. Thank you, Callum
  3. Basically I need to slide the sculpture into a gas kiln, and if I didn’t use a hard base, the bottom of the sculpture would get damaged. I won’t use a kiln shelf because they are too expensive, and the person who is firing the sculpture will not allow any plywood in the kiln. I also have a lot of leftover stoneware clay, so I wanted to make a base out of that, then fire it and build the sculpture on it.
  4. I can’t find a kiln shelf large enough that doesn’t cost hundreds of dollars, so that’s not an option. My only question now is: will greenware porcelain fuse to once-fired stoneware in the kiln?
  5. Hello, I need to use a fireproof platform to use to load a large porcelain sculpture into a gas kiln. My idea was that I could make a slab out of stoneware, fire it, then build the sculpture on that and use it to pull the sculpture into the kiln. The stoneware slab doesn’t need to last two firings, I just need to use it to get the sculpture into the kiln. Would the cone 6 porcelain stick to the cone 6 stoneware when it is being fired, or should it be fine? Thanks, Callum
  6. Update: I just found a place with a large gas kiln that will fire my work.
  7. Thank you all for your replies. I will definitely keep trying to find someone who will fire my sculpture.
  8. Yes, I would also like to have someone else fire my work. The trouble is that I have contacted about 20 or 30 places, none of which so far have been capable or willing to fire my work.
  9. I decided I needed 5 weed burners because the two smaller kilns are a size which I have seen use one weed burner each, and the large kiln is larger than the size that usually uses two, so I thought is should use 3. So 5 in total. But this is not the way it works? I am concerned that if I do not fire to the maximum temperature (cone 6) the sculpture will not be strong enough for my needs. This is because the sculpture is a box, weighing 160 pounds, that needs to be supported by four hollow legs. I worry that if the clay is not fired hot enough, the legs may not be strong enough to support the box. Would firing to a bisque temperature provide enough strength? If not, would firing to a temperature like cone 4 instead of cone 6 be a safe way to fire the sculpture with a minimized potential of collapsing of the clay, but still be strong enough? I have some cone 4 test pieces, could these possibly serve as a good benchmark for results from the first firing? p.s., the rings of the small kilns do not line up at all with those of the large kiln. They would basically be stacked on the middle of the lid of the larger kiln.
  10. Hello, I have a bit of an odd question. I have been considering converting three electric kilns to downdraft gas. I have recently been offered two free small electric kilns, but they are too small for what I want to fire, so I had an idea: would it be possible to stack the two smaller kilns on top of a large kiln and fire the entire thing as one unit? I wanted to use weed burners and propane as the power source, so would it be better to put three weed burners at the bottom of the large kiln, then put one weed burner on each of the smaller kilns? Or would it be better to install the weed burners in a traditional way (all 5 at the bottom of the large kiln)? Thanks, Callum
  11. Yes, I’m sure it requires some trial and error, but saying that it is not possible when it has clearly been done before is misleading.
  12. Hello, I am doing some research into converting an old electric kiln into a downdraft gas kiln. However, I have not found much information on safety concerns which are specific to this type of kiln, other than the general concerns in an electric kiln such as toxic fumes. Could anybody give some safety tips or important information so I can ensure my converted kiln is safe to use? Thank you, Callum
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