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Help KIln was set to hold for 35 hours instead of minutes


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#1 grayfree

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Posted 02 January 2012 - 12:25 PM

Hi somehow I managed to do the dumbest thing!! I have an L&L kiln easy fire. I set if for a fast glaze with hold of 35 minutes only to be agast this morning when it is still firing. I discovered I set it to hold 35 hours instead of minutes. I have cut it off now and it probably held about 10 hours. I have raku clay and speckeled brown stone in there with cone 6 glazes on them. What in the world should I expect with that long of a hold time.. I hope and pray my peices are not ruined I am a new potter and have some of my best stuff (of course ) in there .....BOOO :( Anyone else ever do this??

#2 Matt Oz

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Posted 02 January 2012 - 12:55 PM

Well, depending how vitrified your clay body is at cone 6, it may be okay.
If you used glazes that tend to be runny, they will be verrry runny, a matte glaze may come out cool though.

I did over fire once, not very pretty.
Good luck, hope you get something out of it.

#3 Denice

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Posted 02 January 2012 - 01:00 PM

I had a high school ceramics teacher do this and everything melted into a puddle. What cone does your raku clay fire to? Using Cone 6 glazes on a raku clay body is risky to start with do you mean 06 glaze? Let us know how it came out. Good Luck Denice

#4 grayfree

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Posted 02 January 2012 - 01:58 PM

Oh my .........I dont really know what kind of raku clay it is I buy from my teacher and he and some others us cone 6 glazes all the time on it......so it must be ok for that. it comes from highwater clay.

I do have one very runny glazes archies base on the rim of one pot the others I think are pretty stable. A couple of chinos and amaco firebrick. WEll I hope I dont have to buy new kiln furniture!! That would not be good. We will certainly see and I will post pictures if you promise not to laugh!! I am a new potter remember only been doing this 6 months!

#5 Chris Campbell

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Posted 02 January 2012 - 03:17 PM

You used to be a new potter ... Now you have earned a 'been there/done that' credit..
Also, you will never forget to double check your settings again. :)
Post pictures ... We all want to see what happened.

Chris Campbell
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#6 Lucille Oka

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Posted 02 January 2012 - 03:31 PM

This response is as if we were good friends. I am not going to be as sorrowful.

This is from your own L&L kiln firing manual-
NOTE:
It is critical for someone to be present for, and especially at the end of, each firing. This is particularly true for this first firing. Even if you have an AutoCone Back-up - no safety device is entirely foolproof.

I can understand a few minutes over firing but 10 hours! For shame!
Where were you? (don't answer me).
What were you doing?(definitely don't answer me). Posted Image

But you cannot leave a kiln unattended! When you open the kiln you will learn alot one way or another.
What ever the results will be, be sure to keep a firing log.

Take a picture if you can; if it is a disaster or otherwise and post it to encourage others to be present during kiln shut off or to let us see what a ten hour overfire can do..

If you had been a student of mine I wouldn't have been so light hearted about this. Your kiln is your most important piece of studio equipment don't ever take it lightly.



John 3:16
"For God so loved the world that He gave His only begotten Son, that whosoever believeth in Him should not perish but have everlasting life".

#7 teardrop

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Posted 02 January 2012 - 05:24 PM

It's funny how differently instructors/artists/potters (anyone I missed?) approach things.

Our electric kilns at the college are always fired and left overnight...by the instructor herself. The only kiln that is pysically monitored and logged is the big gas kiln outside where pyrometric cones are used and each person in charge has a different theory on reduction and how it should be done. LOL.

As someone who is also only 6 months into this...I hope yer peices come out OK grayfree!
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind. Dr. Seuss US author & illustrator (1904 - 1991)

#8 grayfree

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Posted 02 January 2012 - 06:08 PM

Well I will say where I was.......was sleeping!! I checked the kiln at 8:00 this morning but still didn't realize it was still firing. I thought it was just cooling down. It wasn't until I checked it at 10:30 did I realize that it was still clicking and firing. I am not how I programed it wrong because I did put the numbers for the hold on the right of the decimal but alas it is what it is and we will see.......I will probably wait up till about midnight tonight when it should be cool enough to open.........Not sure if I should take plugs out and let that help speed up cool down or just wait as the usual cool down happens......

#9 Dinah

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Posted 02 January 2012 - 06:30 PM

Yes, I must backup some of the admonishing replies here. Don't leave your kiln at the end of a firing. Read your manual again. Don't take plugs out. Leave it to cool down to about 93 d C. Don't know Farenheit don't use it in my firings. I think checking the kiln using witness cones and proper peep-hole procedures would assist you. Just think of folks who fire reduction and have to turn out regularly during a firing day and night to check on the progress of the firing. Did you place witness conepacks in the kiln? Should do each and every firing. Without fail. And when I come into to check on a firing I stick around to observe digital readout behaviour and check the witness cones. Belt and braces. Anguish and worry is good. Makes you a better potter. People who have others fire their work for them don't know the meaning of what you're going through.
Dinah
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#10 grayfree

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Posted 02 January 2012 - 07:28 PM

No of course I didn't use witness cones I am a new potter. It's not like I would know what to do with the results of the cones anyway. HAHAHAHA. How do you see in the peep holes...it is dark in there? I haven't used the cones honestly because I planned to start using cones once I learned and understood more about the adjustments on my kiln and what I want to adjust. I have been more focused on trying to get my stuff centered, stop the cracking ......my glazes to look decent. I was depending on a new kiln to do what it is suppose to do. I use the preprogrammed fast or slow glaze program so the only thing I have added was a preheat for bisque firing or hold time. Boy I feel like I have had my hand spanked, just wanted a little encouragment that maybe things will be OK......
Now I know what my daughter feels like when she called after making a mistake and I would fuss about why she should have known better. Wish I would have just held her hand and told her it would be OK no matter what......LOL.

#11 Chris Campbell

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Posted 02 January 2012 - 09:16 PM

Well, the next time someone asks you about firing a kiln I am sure you will emphasize certain things a little more than you would have done last week.
Truth be told, we have all made this level of error and lived to tell the tale ... You didn't mess up someone's brain surgery or wreck the car. It's a kiln load of clay. Some wasted electricity. You will no doubt pay for your error by having some serious shelf scraping to do. Lesson learned and move on to the next mistake.
Truth again ... Been at it twenty five years and in that time have overtired, underfired, glazed with the wrong cone of glaze, left out witness cones by mistake, forgotten to start the kiln, forgotten to be there at the end ... It's called being human. Stuff happens. Just keep moving forward and learn as you go.

Chris Campbell
Contemporary Fine Colored Porcelain
http://www.ccpottery.com/

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TRY ...   FAIL ...  LEARN ...  REPEAT


#12 teardrop

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Posted 02 January 2012 - 09:19 PM

Pullin' for ya. No criticisms here.

Who knows...maybe you'll create a new firing technique and all of these folks whappin on yer knuckles with the teacher's ruler will be dropping yer name in an attempt to impress other potters @ some point in time. Posted Image Remember.....everyone starts somewhere....and it's never the same place.

Follow the manual's advice...wait til the temp hits 250F...then grab some insulated gloves and tear into it

good luck. Don't let em bring ya down.




Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind. Dr. Seuss US author & illustrator (1904 - 1991)

#13 grayfree

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Posted 02 January 2012 - 09:29 PM

Chris thanks for the encouragement and you too teardrop. Will open about 11pm and will let you know! You know what is funny is that I used to do brain surgery....I was an assitant to a neurosurgeon for 11 years. I have wrecked my car a number of times also.....Chris I live in Morehead City and have family in Raleigh do you have a store there?? I would love to come by sometime and see your work if you do.

#14 Peter

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Posted 02 January 2012 - 10:11 PM

No of course I didn't use witness cones I am a new potter. It's not like I would know what to do with the results of the cones anyway. HAHAHAHA. How do you see in the peep holes...it is dark in there? I haven't used the cones honestly because I planned to start using cones once I learned and understood more about the adjustments on my kiln and what I want to adjust. I have been more focused on trying to get my stuff centered, stop the cracking ......my glazes to look decent. I was depending on a new kiln to do what it is suppose to do. I use the preprogrammed fast or slow glaze program so the only thing I have added was a preheat for bisque firing or hold time. Boy I feel like I have had my hand spanked, just wanted a little encouragment that maybe things will be OK......
Now I know what my daughter feels like when she called after making a mistake and I would fuss about why she should have known better. Wish I would have just held her hand and told her it would be OK no matter what......LOL.


Oh, that learning curve's a b....! I do so admire your sense of humour and applaud your resolve to remain hopeful during all the waiting involved...
We've all done things that wouldn't be believed or understood by others both novice and advanced potters. You've earned your stripes and I'm sure you'll never do "that" again. This endeavour involves
countless opportunities for screw ups. Check and then recheck, practice and do as much testing as you can.
It'll fall into place and you'll look back at hurdles like this with a smile and a great story to tell..

#15 Sojourner

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Posted 02 January 2012 - 10:36 PM

No of course I didn't use witness cones I am a new potter. It's not like I would know what to do with the results of the cones anyway. HAHAHAHA. How do you see in the peep holes...it is dark in there? I haven't used the cones honestly because I planned to start using cones once I learned and understood more about the adjustments on my kiln and what I want to adjust. I have been more focused on trying to get my stuff centered, stop the cracking ......my glazes to look decent. I was depending on a new kiln to do what it is suppose to do. I use the preprogrammed fast or slow glaze program so the only thing I have added was a preheat for bisque firing or hold time. Boy I feel like I have had my hand spanked, just wanted a little encouragment that maybe things will be OK......
Now I know what my daughter feels like when she called after making a mistake and I would fuss about why she should have known better. Wish I would have just held her hand and told her it would be OK no matter what......LOL.


Hang in there grayfree, I doubt there's anyone on this forum who hasn't got a head-slap mistake like this in their past - possibly even RECENT past.

Don't take it too much to heart, but learn from it. DON'T do any more firing until you find out a bit more about your kiln and how to operate it though. For instance - peepholes. It's my understanding that you need eye protection to use the peepholes. I've seen raging arguments over whether welder's glasses offer proper protection or some other kind of lenses. In other words, I have the impression (haven't looked into it at all, no pun intended) that you should NOT be looking into those peepholes without eye protection, at least some of the time.

I don't have kiln yet so other than the electrical characteristics of kilns in general (as pieces of equipment) I don't know squat about actually operating them, but I have no intention of trying without getting fully educated beforehand including actual forays into the loading and programming of kilns under the supervision of someone who knows what they are about. In person.

DEFINITELY you need to educate yourself before trying this again, K? Not trying to beat you about the head and neck with it, but this is a high-tech piece of equipment we're talking about, with a lot of power and as much potential for disaster as it has for utility.

Whatever useful resources people can suggest for you, I'll need as well. Knowing the basics of how kilns function electrically doesn't give me any special insight into their actual operation at all.

"I don't need you to remind me of my age. I have a bladder to do that for me."
-- Stephen Fry

#16 grayfree

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Posted 03 January 2012 - 12:25 AM

Well iti s 12:20 and I just opened the kiln........TADA no puddles....no sticking to the shelves......but all peices except 2 ruined with yuk colors. one chip and dip fully cracked all the way across bottom..had one really cute little saucer and my first great batter bowl turned out ok. batter bowl ` is no where near color it should be mostly graded shades of brown but looks nice......Overall I am so greatful I didn't ruin my kiln furniture or my kiln. Thanks to a for your support will try to upload pictures tomorrow for those interested. nite all

#17 MoKa Kath

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Posted 03 January 2012 - 12:54 AM

Glad to hear no major disasters! I am just about to order my first kiln and will take your experience as an advisory! I'll also be ordering cones and peephole glasses with my kiln now!

Looking forward to seeing your photos. :)

#18 grayfree

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Posted 03 January 2012 - 09:12 AM

Well here are the pics......it was a small load thank goodness!!!

Skip to last post had to reload pics

#19 grayfree

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Posted 03 January 2012 - 09:25 AM

I cant get the rest of the pics to load but you get the jest of the colors they are all about the same yuk brown.

#20 minspargal

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Posted 03 January 2012 - 09:34 AM

Thank goodness you didn't have to scrape shelves or ruin your kiln. I always keep a log of every firing and how full the kiln was so i have an idea of how long the firing will be. I once was firing some tiles and when i went to check if the kiln had turn off, it was still going and i had to manually shut it off because when i looked in the peep holes at my cones they were down. Turned out the kiln sitter got stuck, the kiln was 40 yrs old. We all make mistakes, just hang in there. When you set up your witness cones make sure you set them where you can see them thru the peep holes. And don't worry, when 06 cones start bending, it's pretty bright in there and do wear eye protection!




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