Jump to content

eoteceramics

Members
  • Content count

    93
  • Joined

  • Last visited

Everything posted by eoteceramics

  1. Disaster! Ive just dropped a piece of greenware and it broke in two places. Clean break but it was made by somebody else as apresent for her Dad!! Is there any way of repairing it or will I have to own up? Thanks
  2. Strange brown specks !

    As always id be lost without this forum and all the expert advice. Just opened the kiln and the spots have been cured ( read burned out ) Thanks everybody Julia
  3. Hi all If anyone can identify these funny brown specks I'd appreciate it. They are on a white earthenware that I had fired up to 200C over a few hours and then candled I did this to eliminate the moisture as I had had big problems when firing before with explosions. I usually just bisque fire and haven't noticed these specks before. The slabs are resting on silica sand which I haven't used before either. Thanks Julia
  4. firing schedule needed

    Hi I think I didnt convert F - C ( Im in Ireland so we use C) Thanks Neil, I wish you were over here so you could just programme it for me!!, I need my own technician
  5. Hi all, I had a problem with slabs, not too thick , cracking and exploding. From posting in this forum on another thread i realized that my firing schedule was too fast. I need to drive off any moisture in the slabs. I have a Nabertherm B130 controller which has 4 ramps and two temp ramps. Im looking for recommendation for a firing schedule, that will drive off moisture. I can candle but then i cant bisque fire in same schedule as there isnt enough temp ramps. Any help very much welcome. thanks Julia
  6. Strange brown specks !

    Thanks Guys, Im learning as I go Julia
  7. Strange brown specks !

    Sorry my photo won't load. They are like measals and cover all the slabs, look like they are in the clay. Julia
  8. firing schedule needed

    Hi Neil I mean it can be programmed to reach a temp in a certain amount of time then another temp in a given time, then a holding time then a cooling time. It has pre programmes but these are too fat for what I want.
  9. Hi everyone I really need help with this! I am making large slabs 30x30 cm approx with decoration attatched so a 2D effect. I've dried slowly over a week and also used a clay meant to be resistant to cracking / warping. Just got two of them out of the kiln , disaster the pieces attatched to the slab have cracked up and ' jumped' away from where they were attatched. I had broken kiln slab pieces supporting underneath to circulate the heat I'm under pressure now to get them done for a deadline . Any help to sort this problem much appreciated. Julia
  10. Help my slabs are cracking up

    Hi again, Ive the kiln loaded, but due to all the good advice here I need to reschedule the firing schedule. I think it was heating too rapidly causing explosions and cracks. So I have a Nabatherm B130 controller with 4 ramps and a possible two temp points Can anyone suggest a firing schedule, Bisque or should I candle and cool then bisque.? I cant do both in one firing given the number of ramps/ heat..... I think Thanks for your time Julia
  11. Help my slabs are cracking up

    Hi Charlotte, Thanks for all that information. Its good to know, Im nervous about firing the tiles in fact theyre still drying. I dont want to risk firing too soon and have the disaster I had last time. Just a quick question, do you use silica sand under the tiles to allow movement. I got some recently and havent used before. Not sure do I put an evn layer under the tile or little piles. Thanks Julia
  12. Help my slabs are cracking up

    Marcia and glazenerd, Thanks so much. Marcia the photos make so much more sense now, for some mad reason I had a picture in my head of lots of vertical sticks supporting the slabs so thanks for posting. glazenerd great information Im off to the studio to try this, the things you learn on this site are amazing. Julia
  13. Help my slabs are cracking up

    Hi Denice, thanks for your help, The drying time here takes forever, its currently lashing rain!! I suppose I was putting them on that late stage to avoid deforming them when handling them. I will try a bit earlier. I probably do have a book however I find this site excellent for getting questions answered, so much Knowledge and experience. Julia
  14. Help my slabs are cracking up

    Thanks to everyone who has taken the trouble to help out with this. Im sort of self taught when it comes to the technical side of things which is why Im making mistakes. In response to your comments. JosephF I was always under the impression that air bubbles / trapped air causes explosions! thanks for the info that it doesnt. Min Yes your right I didnt score both sides, I'll take that on board, thank you. Tricetra Yes Ive heard of using silica for underneath, Would I spread it evenly under the whole slab or as little even piles? I thought it was preferable to allow the air /heat to circulate under the slab, which is why I was using broken kiln shelf pieces as support. Ill introduce pin holes through the slab where the thick pieces are, thank you. Marcia I dont believe the slab is that thick it about 4mm and then approx 8mm where the deco is attatched. Your drying method is interesting, do you have a photo of the sticks to give me an idea. I havent heard of the coils before but will try and see if my supplier has them. You havent heard of Scarva because they are my usual suppliers based in Northern Ireland. They make their own glazes etc, Im based in the South. Typically how long would everyone give a slab to dry 30 x30 cm, 8mm thick at its thickest but mostly 4mm thick. If I used Marcias method of drying on sticks and wrapped in plastic? I have a Nabetherm kiln, I usually keep to the programme as its always been fine before but Ill try and work out how to reprogramme to slow down the drying at the start. Thanks again Julia
  15. Help my slabs are cracking up

    HI all here is a photo of one of the pieces
  16. Help my slabs are cracking up

    Hi Marcia/ Neil, Maybe they are too thick? but not much thicker than the slab. its not possible to fix with glaze as theyre broken into pieces and stuck onto a different part of the slab. I attatched when leather hard by score and slip and its a proffesional Scarva slightly grogged clay. If I hollow out presumably I would then have to make a hole in the back to prevent them exploding. Ill try and get a phot up here although I thought I had attatche done via my phone. Julia
  17. Hi, I have some large slab pieces approx. 12" x 12". In the past I have had problems when firing ie cracking and explosions. Would using silica sand help and how exactly do I use it? Thanks in advance, Julia
  18. Silica Sand For Use Under Slabs

    Hi, Thanks for all replies Perkolator, Marcia, etc I think you've just saved me a lot of time and hassle. Julia
  19. Silica Sand For Use Under Slabs

    Hi, Thanks for replies, I'll follow your advice. But do you not get warping if fired on their side? Marcia, what coils do you use? and can they lean at an angle against the bricks? Thanks again. Julia
  20. Hi everyone, so Ive just opened the kiln and its not good. I had two large tile pieces which smaller pieces attached on by scoring , slipping wiggling and pressing down really well. Or so I thought the smaller 'attached' pieces have come away from the surface tile making them only fit for the ceramic grave yard. Ive made a piece similar before and Is been fine and the thing is I have three more pieces ready be fired. Can anyone shed any light as to why this is happening? Im certain they are dry and I took extra care in fixing them on, all help much appreciated. Julia
  21. Two Pieces Ruined, Help Needed

    Hi, thanks for going to all that trouble Yes its earthenware and cone 2. It does have a controller so I will attempt to reprogramme to your recommendations and see if its any better. Its hard not to peek but I'll go walk next doors dog ! Thanks again, Julia
  22. Two Pieces Ruined, Help Needed

    Thanks Min, Wow I really thought they were dry, I did the moisture test with my finger and they seemed ok, but I guess not I fire to 1140 °over approx. 12hrs about 100°an hour with a half hour soak. I don't open the door until its under 200°and even then just for a peek. I also never used to cover while drying as It takes so long anyway but will start doing this now. I have to confess these two pieces were left out in the rare sunshine for an hour or two just t speed it up so I suppose that didn't help matters.
  23. Two Pieces Ruined, Help Needed

    Hi, these are the pieces after I took them from the kiln. Pic 2 seems to have just cracked straight across with the attached pieces coming away from the surface. In the first one the piece has seemingly crumbled in one part as well as the smaller pieces coming away from the surface, very curious as to what has caused the crumbling. Any ideas very welcome. Julia
  24. Two Pieces Ruined, Help Needed

    Thanks for replies it was a bisque firing and yes gravity was on my side. Unfortunatley the pieces are broken and unable to glue with glaze. Marcia I might have a photo later. Julia
  25. Hi everyone, I accidentally fired earthenware clay to 1300°, oops. Its all stuck to the kiln bats and I need help in how to clean it all up. There is also one piece fused to a kiln brick. Its a big mess and a lot of work lost. I would really appreciate any help on this. thanks Julia
×