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  1. wondering what method you use to create round cylinders from slabs. The few attempts i've made is to let my slab dry to a soft leather-hard and then just prepare and set the ends together - but I don't get a perfect (or close too) circular cylinder - its always way wonky.
  2. Wondering if anyone has experience with silk screens on clay. I've seen the youtube videos using a thickening agent to use slips to print on clay using screens. I would like to print my own designs thou and wondering if anyone can recommend a good method to print multiples of a design on clay
  3. would love to see a pic of these. can you explain the hot wax?
  4. Not sure if I'm reading your post correctly, but if you are building on the outside of your bowl, then the clay drying doesn't have the room to shrink, even if its just enough for it to firm up, especially at connection points. Have you tried building from the inside of the form? Mark also has a very good point that the pam is most likely also interfering with joins, another releasing agent is dish soap (not sure how it would effect joins).
  5. I'm looking for advise on buying a used kiln. First off I don't live anywhere near a pottery supplier nor is there any used market here. But I have found a down-sizing potter a few hours away who has a 30yr old kiln that he is willing to part with. Electric, cone sitter controlled, i would estimate about 6cu.ft.. The inside is not in great condition and will need kiln cement to patch up some inside brick pitting. This guy has used it continuously in rotation with anther kiln. First of all, would you even bother to purchase such a kiln? and if so what would you pay for it? The closest supplier to me could give me the same kiln for about $3000 (with furniture, taxes & delivery)
  6. I'm looking at various cone 6 clay recipes and have the question of makes a porcelain 'porcelain' vs stoneware. I had thought it was the addition of a stoneware clay but then i came across the following recipes from val Cushing, both are so similar with the only major difference i see being kaolin (Tile 6) vs ball clay (C&C). Category White Porcelain Throwing Source Cushing's Handbook (#2 on p.37) Name VC Translucent White Cone 6 Note Translucent white vitreous body Recipe Grolleg 25 Tile 6 25 Kona F-4 28 Frit 3124 12 Flint 10 Macaloid 2 Category White Stoneware Throwing Source Cushing's Handbook (#2 p.37) Name VC Vitreous White Cone 6 Note White, very strong body Recipe Grolleg 25 C&C 25 Kona F-4 30 Frit 3124 4 Flint 16 Macaloid 2 ps. I found this info on Alfred's universtity website, although i see they both reference the same recipe on the same page. I'm not familiar with Val's book its self to know if this is just a typo
  7. Lol Thanks Mark. I would love to take you up on your offer. Unfortunately I am on an island in the middle of the Atlantic (Newfoundland Canada) and not close to anyone! Thanks for all the responses, I will start with Gillespie Borate and modify recipes for that. Appreciate the Help!
  8. wondering what everyone is doing to compensate for the shortage of Gerstley Borate? I've notice that it is one of the main ingredients in most glaze recipes. I'm just building up my studio and really don't want to become dependent on any material which may be in short supply. Even now my supplier list GB as dependent upon availability. oh I fire to Cone 6
  9. Big Lou I also slurry mix and use silca 325. but I'm interested in what you mean by "age clay with a moldy rag" ? I'm thinking that you are wrapping clay in a moldy rag to get some organics in there.
  10. here is interesting info on Gerstley Borate from Digitalfire: No common natural material comes anywhere close to melting like Gerstley Borate (GB). It begins to melt between 1550F and 1600F and is a clear amber glass by 1750F and ultraclear and glossy by cone 06 (Ulexite melts better but it is not commonly in use in ceramics). It has thus been a staple among potters for many years. 50% can be found in many cone 06-02 glazes, up to 30% in cone 6 glazes.
  11. Sure Lou I'm looking at using/trying Jeff Campana's porcelain: ( trying to source C&C ball clay in Canada) 25 Grolleg Kaolin 10 C&C ball clay 10 Tile ^ kaolin 35 Minspar 200 feldspar 20 silica 325 mesh 2.5 bentonite L-10 white And using Cushing's stoneware recipe: White Stoneware Throwing Source Cushing's Handbook (#2 p.37) Name VC Vitreous White Cone 6 Note White, very strong body Recipe Grolleg 25 C&C 25 Kona F-4 30 Frit 3124 4 Flint 16 Macaloid 2 i picked these two for the similarity in materials and therefore cost.
  12. Thank you both for the information - Neil that was a very interesting thread - great to have Ron Roy have the testing results of both materials.
  13. Wondering how substituting Grolleg in both clay & glaze recipes with EPK will effect results. I have both stoneware & porcelain ^6 clay recipes that call 25% Grolleg, and i'm thinking due to cost of switching with EPK.
  14. please let me know how your changes pan out. I've been pricing out the very similar Campana recipe - most seem to have have high quantities of Grolleg which of course is the most expensive ingredient.
  15. Thank you. I'm not looking for cone 6 glazes, but actual clay body recipes.
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