Babs Posted December 27, 2015 Author Report Share Posted December 27, 2015 Two conversations here but that is no criticism. I will lower the temp I open my kiln as that is what I am concerned about. The clay body/glaze fit would be the worries for the pots. Old lady deg C =(5xTempF)-32 F=(9xtempC) +32 9 5 Link to comment Share on other sites More sharing options...
glazenerd Posted December 28, 2015 Report Share Posted December 28, 2015 Off topic, but you might find it amazing. I primarily fire crystalline glaze, and know many who do. It is very common to pull bunges to get the peak temp of 2340F, down to 2025F as quickly as possible. I have pulled the top bunge before around 400F, and within a few minutes heard that old familiar ping of glaze-grazing. Learned very quickly not to crash cool. I have also installed soft rubber pads around the edges of my kiln so I have something softer to bang my head on when I open it and see the results of my--- Glaze Nerd Link to comment Share on other sites More sharing options...
jrgpots Posted December 28, 2015 Report Share Posted December 28, 2015 So what is the temp now? And have you opened the kiln???? Jed Link to comment Share on other sites More sharing options...
Babs Posted December 28, 2015 Author Report Share Posted December 28, 2015 WELLLLLLLLLLLLLLLL I did take one top bung out at 2ooC then left it till around 80C as all advised. No drama everything looks ok just trying to protect the longevity of the kiln and furniture. I am going to follow advice given,and get on with something totally absorbing. Old dog new tricks so can't promise tooo much. Considering this new kiln cracked in all 4 corners after a very slow initial firing and has, more worrying prob. to me cracks in some of the lid bricks after a few firings, I am treating this kiln with kid gloves basically because I live a long way from the dealer and manufacturer. It finished firing 2.30am Saturday morning I opened it this am Monday around 9.00am. Other firings were bisque, I can leave bisques for days. Link to comment Share on other sites More sharing options...
flowerdry Posted December 28, 2015 Report Share Posted December 28, 2015 "Some pots can ping years later, at least every so often I hear one go in the studio." I swear I heard a pot ping while walking through a museum display of old pots.... Link to comment Share on other sites More sharing options...
Mark C. Posted December 29, 2015 Report Share Posted December 29, 2015 I forgot the other reason to open the kiln early if the tsunami sirens are going off and you have to see the glaze tests before the wave hits Link to comment Share on other sites More sharing options...
Joseph Fireborn Posted December 29, 2015 Report Share Posted December 29, 2015 I forgot the other reason to open the kiln early if the tsunami sirens are going off and you have to see the glaze tests before the wave hits This is important because losing test tiles could be devastating if it was the one best test tile of your lifetime! Link to comment Share on other sites More sharing options...
Cavy Fire Studios Posted December 29, 2015 Report Share Posted December 29, 2015 Ughhh I remember one time I hadda open the kiln early so I could get an Xmas present that underfired a couple days before out to Arizona in time. I'm guessing Fred was still around 350F (no thermometer, but he felt damn hot!!), so unloading that giant car-shaped cookie jar was a real TREAT. On a bright note, that's when I made the permanent switch to Clay Art Center's seward terracotta. If that clay could survive such a sudden temperature shock without so much as a ping, THAT was the clay for me! Praise the ceramic gods for added fireclay! Link to comment Share on other sites More sharing options...
rayaldridge Posted December 30, 2015 Report Share Posted December 30, 2015 Okay okay, but when I was a production potter there were times when it was economically necessary to open a kiln when it was still pretty hot... as in "That show is tomorrow and if I don't start unloading now, I will be short on inventory when I get there." This chaotic business planning also led to a lot of driving-all-night episodes. Of course, then I fired in a hard brick gas kiln that had already been moved a time or two, so I couldn't do it much harm, and I didn't care about crazing glazes (I still don't, actually.) Mark is clearly a better-organized potter than I ever was. Link to comment Share on other sites More sharing options...
Foxden Posted December 30, 2015 Report Share Posted December 30, 2015 Never quite understood the fear of opening a kiln around 250F and then selling the items in it as oven proof for use in ovens as high as 450F. Link to comment Share on other sites More sharing options...
bciskepottery Posted December 30, 2015 Report Share Posted December 30, 2015 Never quite understood the fear of opening a kiln around 250F and then selling the items in it as oven proof for use in ovens as high as 450F. An empty casserole dish in the kiln will cool much faster and go through more stress than a filled casserole dish removed from a 450F oven -- the hot food contents help control the cool gradually. Link to comment Share on other sites More sharing options...
Foxden Posted December 30, 2015 Report Share Posted December 30, 2015 I guess I am just fortunate. Never had an issue in 25 years. Link to comment Share on other sites More sharing options...
Chilly Posted December 31, 2015 Report Share Posted December 31, 2015 Also, while the air temperature in a cooling kiln might read 200, the shelves, furniture and pots could still be much higher. Link to comment Share on other sites More sharing options...
High Bridge Pottery Posted December 31, 2015 Report Share Posted December 31, 2015 I had a check back on my video, they removed the restrictions for some reason. Kinda bad quality https://www.youtube.com/watch?v=bB9PjkoQd0M Link to comment Share on other sites More sharing options...
bciskepottery Posted December 31, 2015 Report Share Posted December 31, 2015 The full story of Bottger and his pursuit of porcelain is in The Arcanum by Janet Gleeson http://www.amazon.com/The-Arcanum-Extraordinary-True-Story/dp/0446674842Excellent read. (Thanks to John B. for the original recommendation) Link to comment Share on other sites More sharing options...
Chilly Posted December 31, 2015 Report Share Posted December 31, 2015 I had a check back on my video, they removed the restrictions for some reason. Kinda bad quality I think I watched the whole program recently. What I don't get is why dropping a pot into a bucket of "room-temperature" water is any different to waving it around in "room-temperature" air. Link to comment Share on other sites More sharing options...
High Bridge Pottery Posted December 31, 2015 Report Share Posted December 31, 2015 I would think the water would transfer the heat away much faster, air is a good insulator. Link to comment Share on other sites More sharing options...
Mark C. Posted December 31, 2015 Report Share Posted December 31, 2015 Almost forgot another reason to open kiln to early Godzilla is spotted a mile away tearing down power lines and vaporizing autos and is headed towards your studio and you only have minutes to get those dog bowls for grampa out and escape in car before he finds the source of where all that power was going ( your kiln) This reason would fit as one that's ok to open kiln early Link to comment Share on other sites More sharing options...
Babs Posted December 31, 2015 Author Report Share Posted December 31, 2015 Do n't know why manufacturers continue to make such finicky stuff. What's so special about 80DC anyway Link to comment Share on other sites More sharing options...
jamescgamblestudio Posted June 17, 2016 Report Share Posted June 17, 2016 What about kiln cooling at high temperatures? My supervisor tells us that just after the kiln has been shut off at cone 10, to leave the damper open at least an inch so that it is cool enough to be unloaded in the morning. I think she is crazy, and I could use some feedback to prove my case. Thanks! Link to comment Share on other sites More sharing options...
Mark C. Posted June 17, 2016 Report Share Posted June 17, 2016 What about kiln cooling at high temperatures? My supervisor tells us that just after the kiln has been shut off at cone 10, to leave the damper open at least an inch so that it is cool enough to be unloaded in the morning. I think she is crazy, and I could use some feedback to prove my case. Thanks! It because she wants to get it over the next day.For me thats a lazy reason. This leaving damper open does not let the glazes soak at temp.Bad on furniture as well. Just all around not good. Scheduling should not trump the work and slow cooling is best practice. Why not wait until the next day to unload??? makes more sense . When you fire a kiln you shut it up when done and let cool on its own not leave it open to cool fast-its in all the books if that helps Link to comment Share on other sites More sharing options...
jamescgamblestudio Posted June 17, 2016 Report Share Posted June 17, 2016 What about kiln cooling at high temperatures? My supervisor tells us that just after the kiln has been shut off at cone 10, to leave the damper open at least an inch so that it is cool enough to be unloaded in the morning. I think she is crazy, and I could use some feedback to prove my case. Thanks! It because she wants to get it over the next day.For me thats a lazy reason. This leaving damper open does not let the glazes soak at temp.Bad on furniture as well. Just all around not good. Scheduling should not trump the work and slow cooling is best practice. Why not wait until the next day to unload??? makes more sense . When you fire a kiln you shut it up when done and let cool on its own not leave it open to cool fast-its in all the books if that helps I agree, it is due to laziness and poor scheduling. Are there any specific books or articles about slow cooling versus crash cooling that I could show her? Thanks! Link to comment Share on other sites More sharing options...
Babs Posted June 18, 2016 Author Report Share Posted June 18, 2016 Don't know if you've read whole thread but apart from lazy or busy I suggest person doesn't own said kiln or the pots therein and so ...... Link to comment Share on other sites More sharing options...
Mark C. Posted June 19, 2016 Report Share Posted June 19, 2016 Its a common sense deal as far as I'm concerned. I have heard of a member of a public clay studio getting tossed out for opening the kiln early (very hot ) as well. . Link to comment Share on other sites More sharing options...
Pugaboo Posted June 19, 2016 Report Share Posted June 19, 2016 Its a common sense deal as far as I'm concerned. I have heard of a member of a public clay studio getting tossed out for opening the kiln early (very hot ) as well. . The community studio here had to put a pad lock on the glaze kiln to keep people from going in and opening it early. They were losing too many pieces due to this even though they all know it's only supposed to be opened by the studio director. They have also put the bisque kiln in a separate room with its own key that no one has except for the studio director for the same reason. People make something and get anxious and want to see it but they aren't forum members so don't know the facts of what can happen to not just their pieces but everyone else's in the kiln too. T Link to comment Share on other sites More sharing options...
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