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| Tips, Techniques, and Questions -- Technical questions or tips |
2009-02-22, 1:24pm
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Resident Luny
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Join Date: Jun 07, 2005
Location: Pacific Northwest
Posts: 2,192
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The Lunesse Cracked Aurora/silver Thread, part 2.
That one is a couple years running and old now, and I received a revelation this morning, so I am just updating for anyone who even cares anymore. 
I went to dear Kalera's house this morning and bummed her pyrometer, came home and stuck it in the kiln. (Caldera).
When my kiln read 970, the pyrometer read FREAKING 800. 800???
Kalera said she had heard of kilns that were off by 100 degrees, crazy crazy. This is way crazier.
I upped the kiln program to 1100. The pyrometer reads 940, the very bottom end of what Bullseye glass likes.
Ok, so maybe this huge mystery is solved. But....how did all my other beads, the ones without silver leaf, survive at such a low temp? That almost makes me not believe it could possibly be THAT off, because wouldn't everything die, shouldn't all the bullseye beads crack if they were sitting at 800 ish for the past year plus?
???????
And what do I do now? Can you reset a Caldera? I know I can just run it at pretend 1100, but I would really rather know where I am really at.
I'm going to go out there and make beads at "1100" right now and see what they do, survive, or flatten out on one side on the shelf.
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2009-02-22, 3:27pm
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Senior Member
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Join Date: May 21, 2006
Location: Cincinnati
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I'm so glad you got an answer finally!! But off that much, is crazy. I'm surprised you didn't have more trouble, too.
Sorry I don't know how to fix it, though.
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Cheetah, 5 lpm and 7lpm conc/generator (8-9 psi), natural gas (booster), started 11/06
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2009-02-22, 3:41pm
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Senior Member
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Maybe it has PMS and is only off certain days of the month??
Paula
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2009-02-22, 4:24pm
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Ass-kicking Cephalopod
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Join Date: Jun 19, 2006
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You should just need to buy a new thermocouple. Mine was off by over 150, so I am not at all surprised by your results.
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2009-02-22, 4:25pm
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Ass-kicking Cephalopod
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Oh and btw, mine is STILL off by about 125 degrees - I just learned to adjust.
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2009-02-22, 4:50pm
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I need more boro stuff
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Join Date: May 10, 2007
Location: Sydney, Australia
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Quote:
Originally Posted by lunesse
Ok, so maybe this huge mystery is solved. But....how did all my other beads, the ones without silver leaf, survive at such a low temp? That almost makes me not believe it could possibly be THAT off, because wouldn't everything die, shouldn't all the bullseye beads crack if they were sitting at 800 ish for the past year plus?
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Not always crack. It's the same way when I didn't have a kiln before. I put all my beads in heated vermiculite before send them to someone for batch annealing. All my earlier beads (wonky, testing new stuff and colors) when I started are still intact and none of them are anneal.
I'm glad you found out the reason 
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2009-02-23, 11:04am
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Dildo Kween!
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On the face of the temp guage there will be a small set screw under the dial face. It's very small. *That* is what you need to be turning ever so slightly to calibrate your kiln.
Next... I predict that there will be many latent breaks using any of the silvered colors. When I was producing color in the Czech Republic we were incorporating silver and golds into the pot - heavy metals are fine for the most part, but they are really not compatible with the coe of glass. After a while they will crack unless the lead content is has made the coe over 130. It might be 5 years, hopefully by then the bead artist will have a different phone number. Sorry to be such a pessimist. Been there, done that.
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2009-02-23, 1:45pm
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Resident Luny
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Join Date: Jun 07, 2005
Location: Pacific Northwest
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well fortunately I do not have many things made with silvered colors, or if I did, very little of it.
Thanks for the info on calibrating, Heidi!
p.s. all beads from yesterday survived and were not overheated to slumping. woo!
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