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Pawelpksa

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  1. Grinding tool

    Thanks to all, I will try both diamond head and hand carbide rub-brick
  2. Grinding tool

    I have to grind dirty shelves from remainings of the glaze
  3. Hi, what grinding tool do you use? Especially for bigger surfaces like flat bottoms (no foot) or just kiln shelves. I searched through discussions. People use Dremel tools but I think it is just for foots or details covered with glaze.
  4. cracking bottoms in the kiln

    Aha, thanks, seems to be simple
  5. cracking bottoms in the kiln

    Yes, sure about EPK but how to get ‘calcined EPK (bisqued to cone 08 or so)’ ?
  6. cracking bottoms in the kiln

    Hi, thanks a lot. I will grind the shelves and apply wash again with a paint roller. Regarding the idea of glazed button - the middle picture (red clay) is misleading because it was positioned on seeshells (you can see the 3 marks). But maybe you are right that they are dirty in general and same traces of old glaze could have remained on the shelves. The idea of sharp edges is very interesting. I will have to look for other post to understand what exactly you mean by smoother edges... i didn’t grind the bottoms from any wash, there was no need. Wash itself was applied in 3 runs as creamy paint. Thanks for recipe. I’m from Poland and I don’t think that ‘calcined EPK’ naming is recognized here. What exactly it is? In my recipe I use 1:1 kaolin and alumina hydrate. Regards
  7. cracking bottoms in the kiln

    Hi, I was changing wash 3 times: twice it was commercial mixture, 3rd time my own (50-50). May you give good recipi? Other hints than wash? See more pictures on different clay.
  8. cracking bottoms in the kiln

    Here is the picture. I will make better (with more severe cases) tomorrow. No, I don't glaze the bottom
  9. Hi, I would like to ask you for help regarding some trouble with cracking bottoms of my pieces in the kiln.effect that is not described below. When I fire in my electric kiln I can observe that the bottoms of the bodies get stack to the shelves or just crack at the bottom. See the picture here<https://1drv.ms/u/s!AkzUYiXaPPNa3TZ80pGXEUeQBfob> (often there are more severe and damaging cases) So, I think it is not: - Overheating above clay limit as I happened to different clays including porcelain. In all the cases the clays were supposed to survive the temperate of the firing (about 1230 C). - Overheating due to broken controller, because no other signs of it, it happens on every shelf. - Shelf wash because I changed it 3 times I wonder how to avoid this problem? What is the root cause? Maybe the atmosphere from the glazes or wrong heating curve (usually 80C/h to 600C, 120C/h to 1230C, 20min, skip)? Can you share your opinion? Thanks in advance
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