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Boro Room -- For Boro-related tips, techniques, and questions. |
2009-09-05, 11:15am
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Corgi Cult Member
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Join Date: Jan 10, 2006
Location: Central Illinois
Posts: 3,723
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Annealing Schedule Just for Beads
I'm wondering if I could use a faster annealing schedule if I'm only annealing BHBs that are approximately 15mm x 10 mm. Currently I don't have enough large mandrels and would like to make two batches in one day. My kiln is firebrick.
My current schedule:
Garage 1050
Anneal 1075 for 1 hr
Drop 200/hr to 960 and hold 30 mins
Drop 200/hr to 850
Off
At 400 I've been venting till cool enough to handle. Seems like it take 6 hrs to get to 400. Could I vent sooner?
Oh, I've been flame striking. Thanks!
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Kathy
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2009-09-05, 12:11pm
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Marbles, dude, Marbles
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Join Date: Jan 06, 2007
Location: Coral Springs, Florida
Posts: 653
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For beads - 1050 for 1/2 hour. Then turn kiln off. I don't open the kiln door until its down to 200 or less (for my own safety, and also because 'grasshopper must learn patience'). Also, figure out your own annealing schedule by using the 'concrete refrigerator test'. Make a large bead. Anneal for 1/2 hour. Let cool. Remove from kiln, hold overhead and drop on concrete floor. Put into freezer for 1/2 hour. If it is still in one piece with no cracks, a half hour is good.
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A marble a day keeps the 'willies' away.
Gerald Kappel
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2009-09-06, 12:38am
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Harold Williams Cooney
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Join Date: Jan 13, 2009
Posts: 713
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Quote:
Originally Posted by artwhim
. . . I'm only annealing BHBs
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what is a BHB?
Quote:
Originally Posted by gmkcpa
. . . by using the 'concrete refrigerator test' . . .
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I have no words . . . or abbreviations.
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2009-09-06, 7:15am
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Pyromaniac
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Join Date: Jun 27, 2006
Location: Out there on the interwebs
Posts: 1,784
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BHB = Big Hole Bead
If you can flame strike the beads, there is no need to hit 1075.
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Chris Scala
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2009-09-06, 1:29pm
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Serenity Now!
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Join Date: Jul 15, 2005
Location: Deep in the woods
Posts: 3,358
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Alternatively, what I've done when using some specialty mandrels, is half-fill a crock-pot with vermiculite, and leave it at high setting. Make my bead, toss it in, allow to cool so I can re-coup my fancy mandrel, and then batch anneal all crock-pot beads at one time. Works like a charm, and I've not cracked any yet.
Further, I agree with annealing at 1050 if you are flame-striking ~ I think the extra step at the end of your schedule above could be taken out completely. I hold for 30 minutes at 960, then off. I crack my kiln at 400 or below.....
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Val Lewis
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2009-09-06, 10:45pm
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Corgi Cult Member
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Join Date: Jan 10, 2006
Location: Central Illinois
Posts: 3,723
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Val, awesome idea to reuse the mandrels in the same session!
Thanks everyone, those tips should have speed things up a bit.
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Kathy
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2010-01-17, 12:17am
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Not the insurance!
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Join Date: Jan 21, 2009
Location: Dansville, NY
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2010-01-18, 7:47am
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Senior Member
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Join Date: Jun 10, 2005
Location: Manhattan,KS the land of Purple Pride
Posts: 7,718
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I copied this off. Will have to get busy with the boro. Thanks every one.
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