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Boro Room -- For Boro-related tips, techniques, and questions. |
2012-12-24, 4:08pm
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Renee
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Join Date: Dec 21, 2006
Location: Carrollton, GA
Posts: 244
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Batch annealing help?
Hi! I made a bunch of clear icicles and need to anneal them. Do I have to bring kiln up slowly, or can I just put them in a kiln at 1070? I'm used to soft glass and small boro beads- I didn't make the icicles at home, so still want to anneal. Thanks! Renee
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2012-12-24, 4:32pm
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Bernhard Riegler
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Join Date: Jun 03, 2010
Location: Northland - New Zealand
Posts: 452
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bring it up slowly. Avoid any heat shock to be on the safe side
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Bernhard Riegler - Bay of Islands - New Zealand
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2012-12-24, 4:57pm
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Senior Member
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Join Date: Jun 14, 2005
Location: The Rocky Coast State!
Posts: 6,620
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I'm a better safe than sorry kinda gal as well. Boro is tougher but why take chances? Don't ramp it up full speed.
Sue
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Sue Walsh
The past is history,
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and the present is a gift.
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2012-12-24, 5:18pm
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Renee
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Join Date: Dec 21, 2006
Location: Carrollton, GA
Posts: 244
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That was my idea too, but thought I'd ask! Thanks!
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2012-12-24, 11:25pm
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Alaska Boro
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Join Date: Dec 10, 2009
Location: Anchorage, Alaska
Posts: 1,065
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"Contemporary Lampworking" indicates that the temperature rise from room temperature to annealing temperature should be at a rate that should not exceed 27 degrees F per minute for a piece that is one inch thick. For 1/2 inch 108 degrees F per minute.
If your aim temperature is 1050 F then 1050 divided by 27 is 39 minutes for a maximum rise time for 1 inch material.
In my case the kiln has no ramp up as it takes 57 minutes to reach annealing temperature which is adequate for a 1.25 inch piece from cold to hot. For a 2 inch piece 156 minutes for a ramp up time, etc.
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2012-12-25, 12:58am
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Co-owner
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Join Date: Jun 22, 2009
Location: South Jordan Utah
Posts: 313
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Good information. Thanks for sharing the formula.
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2012-12-27, 9:26am
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ManBearPig
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Join Date: Jun 28, 2005
Location: Roanoke, VA
Posts: 8,540
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I throw stuff in at room temp and ramp it up full speed all the time. That includes marbles, pendants, and whatever else. I've never lost one to thermal shock. The key I've found is to make sure you hold it at temperature long enough to let the temperature equalize throughout the piece before starting the annealing time and the ramp back down.
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2013-01-30, 7:54am
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Member
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Join Date: Sep 01, 2012
Location: Chicago Area
Posts: 41
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Thanks Alaska
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2013-01-30, 9:14am
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Senior Member
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Join Date: Nov 06, 2005
Location: Austin - Texas
Posts: 2,708
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Cosmo, how would you handle a 3" marble that needs to be reworked a bit? It has already been annealed, but I decided to do a bit of grinding on it, and rework it in the flame. I am thinking that ramping it up over 2-3 hours would work, but I am not sure. Don't want to lose this one for sure!
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The world is a dangerous place, not because of those who do evil, but because of those who look on and do nothing. ---- Albert Einstein
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2013-01-30, 9:35am
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Senior Member
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Join Date: Jan 29, 2009
Posts: 1,958
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Eric I just wanted to share that I have just successfully reworked a marble that was two inches. I put it into the kiln and it ramped (full) up from room temperature to 950f. It actually went through several sessions as I wanted to see how much I could throw at it. When I finally did rework it I grabbed it with tongs and got it into the flame then punty''d up right away then really got the heat to it til it glowed all the way inside. reworked and put it back into the kiln. The only thing I would do different is I would have a tray made out of glass for the marble to rest in the kiln as I had to clean off some kiln dust before I reworked it.
After it sits in the kiln at 950f I do ramp to 1050 for 2 hours then down to 850f for 1 1/2 hours then off.
Pendants and such I will just pop into the kiln even in mid cycle but I wouldn't recommend doing this with something thicker.
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2013-02-01, 12:24pm
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Formerly Bakerman44
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Join Date: Dec 02, 2010
Location: Shreveport, Louisiana
Posts: 316
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Quote:
Originally Posted by Cosmo
I throw stuff in at room temp and ramp it up full speed all the time. That includes marbles, pendants, and whatever else. I've never lost one to thermal shock. The key I've found is to make sure you hold it at temperature long enough to let the temperature equalize throughout the piece before starting the annealing time and the ramp back down.
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This is my experience also. I keep stuff in the kiln for days and weeks at a time waiting to be used. I never pay it any special attention. I would't put any large marbles in there this way but 1" and smaller, you should be good to go.
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