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Showing results for tags 'cooling'.
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I just bit the bullet and bought some Advancer shelves. I fire a 7ct L &L in an outside shed. Its about 30 outside and I'm concerned about when I can open the kiln. I am in the Christmas crowd when it comes to opening. I try to fire early in the morning so it will fire all day when I'm around and then cool all night & I have no choice but to go to bed. Anyway Advancers are subject to cracking with uneven heating or cooling, but ALL of the references to this come from folks use large gas kilns, you know with dampers and such. Anyone here use Advancers in the electric and how do you handle cooling? Many Thanks
Three questions: (1) The manual (yes, actually read & referenced) for my L&L Easy Fire kiln, plus an Orton Tips sheet, say to have the vent (Vent Sure) running continuously throughout the firing. Both specify to NOT open any peep holes. OK...but then how do I see my witness cones? And if the answer is in front of my nose somewhere, please be gentle as you chuckle! (2) The instructions for upon firing completion say it is safe (and preferred, I gather) to turn off the kiln. It also says that the controller will continue to read out the temperature as it cools down. Well, once I turn the kiln off (toggle off) and turn off the juice (main breaker), there is no read out on the control panel. So how am I supposed to know the temp as it cools? And if that info is in front of my nose, same petition for mercy as in #1. (3) About how long is an "average" (I know, no such thing) cool down? The manual does not speak to this at all (other than instructing to keep the vent running and don't open the peep holes). Based on what I have read in other sources, some say roughly twice as many hours as the fire, some say about the same number of hours as the fire, some say just wait until there is no warmth felt at all on the surface, and some say when it is 200 degrees or less...but per #2 (kiln off, no lights/read out on control panel), I have no way to know what the temp is. So-am I doing something wrong with the shut-off? At this point I don't care if the info is in front of my nose and the reader is rolling on the floor--just gimme the how-to's that I am clearly missing. THANKS in advance.
I wanted to know how fast my kiln is actually heating up and cooling down so I decided to record the temperature changes while kiln was in regular used. Fully loaded and set to run our typical program. I used a simple webcam and pointed it at the hand controller (Bentrup TC88). Webcam took 1 frame per minute and recorded it to my HD (actually a DropBox folder so I can see from home, what was/is happening). Bisque firing was as expected. Nothing interesting there. Glaze firing was a bit different but also nothing unexpected. From the ambient to 600C, at 120 C per hour was not a problem. Going from 600 to 1258, at 150 per h started out fine but slowed down after reaching 1123 C (2053.4 F). It did not climb 25C (77 F) per every 10 min any more. From 1123C on it slowed to 22, then 20, 18, 19, 17, 16C per 10 minute before reaching 1257C (2294.6F), holding this was not a problem. Cool down was more "interesting". Coming down from 1257/1256C, temperature dropped 55C (131F)in first 10 min. 10 more minutes and kiln was at 1160C. Additional 37C degrees was lost in following 10 minutes. Following charts show loss of temperature per 10 minutes and compares bisque and glaze firing. In one hour, kiln was 1032C and had lost 224C. 140C was lost in the following hour. 24h from the start of firing, kiln was at 221C and cooling has slowed to a crawl. This is where I usually pull the plugs to speed up the cool down unless I am in so hurry. Bentrup TC88 can slow down cooling if needed. It allows me to program some really tricky firing schedules, with 10 segments, if needed. It can save ... mmm I thing 16 programs, each with up to 10 segments. This charts shows the drop in temperature in percentages per 10 minutes.