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jojess

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  1. I'm still learning how to navigate my kiln.... 10 months of using a new electric kiln, only to have to replace it with different model due to faulty bricks, hence i have to fire a different kiln. I have one spy hole and one vent hole in the lid. I don't have a vent system. I use cone 6 commercial glazes on stoneware and midfire porcelain. What are your suggestions as to plugging either of these two holes for a glaze firing. I have read many different opinions and the manufacturer of the kiln is different again. What happens to the glazes when the holes are plugged or not plugged? Do y
  2. Hi Jojess, I am going to say grog, (because that is what I use), in place of sand, (what you use). When I have grog stuck to the back of my plates, I rub the backs together and it comes off. Or I can use any fired flat bottom to rub off anything that sticks, like grog or kiln wash. The grog should be thin to avoid unevenness. I do leave the grog on my kiln shelves, however, I do rub the sides and bottom with a clean dry green scrubby before placing in the kiln to avoid any stray grains. I don't know if you saw it, but I described how to apply the grog to the shelf above. Hi Karen, th
  3. Hi Again I have unloaded the glaze firing and i put sand on my shelf... thankfully no cracks this time, but the sand has stuck to the back of the 3 pieces and also to some of the shelf, is this normal & should I try to clean it off the shelf or just put more sand on it for the next firing??? How thick should the layer of sand be? Should you be able to see some the shelf through the sand or should it be totally covered. What kind of sand should i have used? I have made some small coil rods to try next time, so will bisque these next time. Once these are bisqued, Should these be place
  4. I have just unloaded a bisque firing with only 2 large hearts and 1 flat tile. One of the hearts has a fine crack in the same place as my other heart cracks, but with these two i was super careful of handling them, used a round cutter to make the V of the heart and compressed very gently They had 3 weeks drying as i went away so were untouched while drying. Why would one crack and not the other??? I had them flat on the kiln shelf with nothing under them. Should i use sand in a bisque firing as well. I am not going to glaze and fire this one again now as i have learnt that the crack only
  5. Hi, the hearts vary in size with the largest being 22cm in length 18cm wide and approx 1-11/2 cm thick. i will try sand next time. thanks for all the suggestions.
  6. Hi Babs, i had softened the curve, my kiln is set to skip a cool cycle. I open the kiln 30-50degs C
  7. Use a round cutter (drinking straw/metal tube etc) to make the v of the heart, then use a knife to cut from the hole already created. This should help to stop the cracks from propagating from the sharp corner. thanks Benzine, i will try that with a cutter I did make the centre point a very soft curve, still cut with a knife tho and it still cracked.
  8. Hi Min the crack has no glaze going down into it it just looks like a clean break. I use commercial underglazes and commercial clear glaze over the top am too new to start mixing my own yet!!! A lot of good advise given to you already but I'm wondering about cooling dunts starting at the weak spot of the pieces. How fast does your kiln cool down and how big are these pieces? Plus, what temp do you crack open the lid? Hi Min, i have the electronic controller set to skip for the cooling. I open the kiln at approx 30-50 degs C
  9. hi to your cat I have made the 'v' of the heart less sharp and more rounded to avoid sharp angles but still had cracking, i will try compressing the edges more. Is it special sand that you put on the kiln shelf??
  10. Hi Benzine, wow there are helpful people on this site , this is the first time that i have asked a question and am so thankful that people are happy to offer advise. I did change the shape of the heart so there is a softer angle at the top and not a sharp 'V' but some of them still crack. I am handcutting them so is this the problem?? should i lift them off the shelf with stilts, i am just worried about sagging tho.
  11. Hi Min the crack has no glaze going down into it it just looks like a clean break. I use commercial underglazes and commercial clear glaze over the top am too new to start mixing my own yet!!!
  12. I am a newbie to pottery about 6 months into this exciting media. My knowledge is limited so am still learning...... I am using stoneware and mid fire porcelain clays firing to cone 6. My Big problem is i have many pieces crack after the glaze firing. I make lots of flat heart shaped wall hangings and so many of these are cracking in the same place every time like in the dip of the heart or like the centre of a 'm'. I am very careful with my slabs and slow drying etc, to keep everything flat. they come out of the bisque fire ok, i then underglaze and clear glaze before the final firing.
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