Farideh Posted February 19, 2020 Report Share Posted February 19, 2020 Hello.... I have made several tall vases using slab roller and cylindrical forms that have survived the bisque fire, however, failed and bent during glaze fire. Clay i use is B-mix 5 with no grog. I only had one witness cone in the kiln and it showed proper heating to cone 6. What can be the cause of this failure? Elements in the kiln where all replaced two months ago, and pieces where all on the same half shelf. Appreciate all inputs. Link to comment Share on other sites More sharing options...
JohnnyK Posted February 19, 2020 Report Share Posted February 19, 2020 Welcome to the forum Farideh...could you send some pix of the bent vases? Link to comment Share on other sites More sharing options...
neilestrick Posted February 19, 2020 Report Share Posted February 19, 2020 Can you post pictures of the pieces? It could be slumping from getting too hot, or movement from the slab construction. Link to comment Share on other sites More sharing options...
Rae Reich Posted February 19, 2020 Report Share Posted February 19, 2020 If you are rolling each pass in the same direction, and especially if you have only one roller pressing on the clay, you may be compressing one surface of the slab more than the other. The clay will remember this torque when softened by firing. Link to comment Share on other sites More sharing options...
Farideh Posted July 12, 2020 Author Report Share Posted July 12, 2020 My apology as I thought I would be flagged when a reply is posted to my question .... just realized it is not setup for notification. here is a photo ... it may already be too late. Link to comment Share on other sites More sharing options...
neilestrick Posted July 13, 2020 Report Share Posted July 13, 2020 @Farideh Warpage is common when working with slabs. Make sure you're rolling the slabs in multiple directions- roll a little bit, turn, roll a little bit, turn, etc. Don't roll it down to thickness all in one direction or the clay particles will align in that one direction and be more likely to warp during glaze firing. Personally, I don't consider the warpage in that piece to be a failure. Perfection is not necessary, imperfection adds character. Link to comment Share on other sites More sharing options...
Joseph Fireborn Posted July 13, 2020 Report Share Posted July 13, 2020 28 minutes ago, neilestrick said: Personally, I don't consider the warpage in that piece to be a failure. Perfection is not necessary, imperfection adds character. ^ Link to comment Share on other sites More sharing options...
Mark C. Posted July 13, 2020 Report Share Posted July 13, 2020 32 minutes ago, neilestrick said: @Farideh Warpage is common when working with slabs. Make sure you're rolling the slabs in multiple directions- roll a little bit, turn, roll a little bit, turn, etc. Don't roll it down to thickness all in one direction or the clay particles will align in that one direction and be more likely to warp during glaze firing. Personally, I don't consider the warpage in that piece to be a failure. Perfection is not necessary, imperfection adds character. Me too Link to comment Share on other sites More sharing options...
Rae Reich Posted July 13, 2020 Report Share Posted July 13, 2020 Sometimes you want it, sometimes you don't. Link to comment Share on other sites More sharing options...
Pres Posted July 13, 2020 Report Share Posted July 13, 2020 Hand made, and is proud to show it. Once and done usually does not get your where you want to go, try a series of them rolling in different directions, doing other things. best, Pres Link to comment Share on other sites More sharing options...
Farideh Posted July 17, 2020 Author Report Share Posted July 17, 2020 Thank you all for giving my question a second look ... i shall give rolling in multiple direction a try. Link to comment Share on other sites More sharing options...
Sorcery Posted July 30, 2020 Report Share Posted July 30, 2020 On 7/16/2020 at 10:30 PM, Farideh said: rolling in multiple direction a try. When rolled into a cylindrical shape, the effects of a single side rolling are usually negated. If you rub your seam closed in one direction, you reintroduce specific orientation. It Bent toward the seam? Sorce Link to comment Share on other sites More sharing options...
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