Wow, Thanks for the quick replies! To answer your questions: Min- Bisque fire was 8.5 hours. Nerd, Clay body is a nice red earthenware Sedona Red, sold by Dick Blick. I left two peep holes open. Propped lid to 1000degrees. Then closed lid for remainder. I did run a box fan on a chair blowing away from the kiln while lid was propped. An old house but fairly tight to outside air. At one point I opened the door about 4" (It is FREEZING cold up here on an island in Maine!) for a while. I think you may be onto some things. The kiln might have been just too full to allow gas to escape especially in light of not having ventilation. (I used to love the downdraft I had installed at the high school where I used to teach). I think I packed 36 bowls into the bisque kiln- nested those bowls three deep. Another possibility you might have hit on is too thick glaze application. Normally I brush it on. Label says it's pourable, but it's very thick and in retrospect maybe it should have been thinned in order to pour. Finally,, Benzine, I don't think a new kiln is an option for me right now! But thanks- I'm lucky to have one out here on this island! It was l"oaned" to me by a wonderful, generous potter-turned-painter friend. I did replace the computer panel about 8 months ago, Maybe I could replace the thermocoupler? Your replies have actually caused a feeling of hope when I thought there was none! Appreciate it...
yappystudent liked a status update: Hi! I ended up here because of your heading "single firing an electric kiln to ^6! I
Hi! I ended up here because of your heading "single firing an electric kiln to ^6! I used to visit your area (Antietam and Shepherdstown) frequently when I lived in Maryland. Now I live on an island 10 miles off the coast of Maine where electricity costs 70 cents a KWH!!!! Unfortunately I am addicted to making ceramics.
Luckily I can sell my pots through a co-op here in the summer. Between costs for boat freight for clay and electricity, I don't know if I could afford to sell at wholesale.
As you can surmise, it would be fantastic to be able to save a firing for each piece. Did it take you a long time to figure out how to successfully once-fire?
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OldLady is the reason I single fire now. She made it sound so easy. I bought Steven Hill's video on spraying glazes. Bought a Critter sprayer, a compressor from HarborFreight. I will say the critter stayed in its box for a couple of months - fear of the unknown. When I started to spray not enough glaze was being put on the piece. Took about 5 test firings before I got the hang of it. Been spraying now for about 2 years - will never go back to dunking donuts - haplessly dipping pots.
OldLady said the glaze should look like chunky velvet as an indicator to how much glaze to spray on the piece. I have posted that pic several times in spray glaze threads.
I have dipped single fire test tiles. But, the glaze was way too thick or either the clay sucked it up. I don't dip greenware test tiles anymore.
Yes it takes more time to spray than dip. But the freedom you get from spraying is just outrageous. The firing schedule must change but only in the very beginning. Up to 500*F, then fire the schedule you have always used.
I do pour into closed pieces just like I did for bisque ware. Wait overnite then start spraying the next day. Bowls are sprayed on the outside first, sitting upside down on a banding wheel. Then turn them right side up and spray the inside.
You don't need a fancy spray booth. I used a converted trash can for a booth for the first year. https://www.facebook.com/media/set/?set=a.417445012878.195322.344268547878&type=3
Figured it was time to step up to a better booth and made one out of a shower base and plastic cardboard for the walls and ceiling with a bathroom fan for exhaust.
You can PM me if you want any pics or more info. Glad to help.
You are going to love single fire. I guarantee.
You also make a spray booth out of a dishwashers plastic liner. Denice
Very interesting! Currently working on remedying a blistering problem I'm having (Posted in the glaze thread). This will be my next endeavor after resolving that issue.
Thanks for your initial input-It's very encouraging!
Hello all, My first time posting here, but I am at wit's end! Problem should not be this complicated. I'd appreciate any advice: Blistering of Amaco LG-10 clear glaze used on Amaco Sedona Red Clay body on interior of 5 1/2" diam bowls. Exterior worked fine using layered Amaco Artist's choice Exotic Blue, Seafoam Green, a band of clear. Will try to summarize scenario and conditions : 1. Electric Kiln in the damp basement. No vent. 2.. Bisque fired (tightly packed kiln!) ^04 3. Wiped interior and exterior with damp sponge, holding base of bowl. 3. Glaze poured into interior, brushed on exterior. 4. 4 bowls on each shelf on three levels of shelves. Bottom shelf was about 1.5" above tops of bowls, 5. Subsequent shelves less than 1" above bowls. 6. Fired to ^05 at preprogrammed medium speed (8.5 hours) 6. Blistering occurred at all shelf levels and equally on insides of bowls. 7. touched up glaze, Re fired at ^05 on Slow speed with a 10 min hold (13.5 hours) 8. STILL BLISTERING - Maybe fewer blisters than originally, and some dark spots and indents where maybe a blister burst and settled out. Please advise at your earliest convenience!!!
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