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| Tips, Techniques, and Questions -- Technical questions or tips |
2010-09-07, 9:01pm
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Junior Member
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Join Date: Apr 27, 2008
Posts: 1
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How to fix a cracked bead?
Hi everyone,
This is my first time posting, although I've used the site many times. I made an amazing underwater bead that cracked (argh!!). The crack appears to be due to uneven heating/letting the bead get too cold (??) even though I thought I was really careful. Is there any way to fix this bead by heating it up really hot in the kiln? ...Or any other way? I'm (hopefully) attaching pics.
Thanks!
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2010-09-07, 9:54pm
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burnin' glass just becuz
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Join Date: Apr 16, 2006
Location: Ottawa, Canada
Posts: 1,251
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yup, i've done it several times but it's not easy: don't remove bead from mandrel, put cold bead in kiln, ramp up slooooowwwlllyyy no more than 200F/hr to preheat in the kiln to about 980F. let bead sit at max temp for at least an hour - you want the bead to be evenly heated through to the core
then... here's the tricky part (so if you really love this bead maybe practice with another cold bead first)... cool the mandrel with a damp cloth and remove the bead. begin waving it faaarrr out in your flame slowly wafting/twirling the bead in and out of the flame to slowly reheat it evenly.
moving slowly is the key - the idea is to slowly reheat the bead through to the core without cracking it so watch the layers of glass and as each layer heats to glowing you can move a few mm closer to the normal working range. you'll know if you're moving too fast as the bead will likely explode, lol...
if nothing else consider this great practice in heat control...  Good luck!
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Evelyn - Carlisle Lucio w/ 8lpm EX-15
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Give ideas away - there are new ones underneath... Diane Vreeland
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2010-09-07, 11:09pm
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Unmedicated since '62
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Join Date: Jan 18, 2009
Location: Hunter Valley, Australia
Posts: 5,907
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wow really nice bead - worth giving it a go, good luck
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Deb
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- my 17yo sons first novel
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- download, get organised, enjoy
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2010-09-08, 12:03am
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I speak Murrini!
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Join Date: Oct 12, 2006
Location: In a Glass House, CA
Posts: 9,170
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Quote:
Originally Posted by ewdb
yup, i've done it several times but it's not easy: don't remove bead from mandrel, put cold bead in kiln, ramp up slooooowwwlllyyy no more than 200F/hr to preheat in the kiln to about 980F. let bead sit at max temp for at least an hour - you want the bead to be evenly heated through to the core
then... here's the tricky part (so if you really love this bead maybe practice with another cold bead first)... cool the mandrel with a damp cloth and remove the bead. begin waving it faaarrr out in your flame slowly wafting/twirling the bead in and out of the flame to slowly reheat it evenly.
moving slowly is the key - the idea is to slowly reheat the bead through to the core without cracking it so watch the layers of glass and as each layer heats to glowing you can move a few mm closer to the normal working range. you'll know if you're moving too fast as the bead will likely explode, lol...
if nothing else consider this great practice in heat control... Good luck! |
Evelyn...please forgive me for adding to your awesome explanation...but I feel this should be clarified since the original poster is trying this for the first time:
"...then... here's the tricky part (so if you really love this bead maybe practice with another cold bead first)... cool the (exposed portion/handle part of the) mandrel with a damp cloth and remove the bead (still on the mandrel!) from the kiln. begin waving it faaarrr out in your flame slowly wafting/twirling the bead in and out of the flame to slowly reheat it evenly."
One additional suggestion:
While slowing moving the bead in the flame, try to avoid hitting the cracked area directly with the flame in the beginning of the re-heat. Flip the bead one side (where there is NO crack) and waft and wave it in the flame. Flip the bead 'round to the other side and continue to waft and waive it in the flame. Once these two uncracked sides begin to show signs of glowing, then slowly introduce the cracked areas into the flame. This will also better your chances of preventing it from cracking further.
Yeah?
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~DeAnne~
I've got a murrini for that,'ya know!
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"Only a fool rushes to his own demise..." ~Zorro
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2010-09-08, 3:52am
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Favorite color is shiny
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Join Date: Mar 01, 2008
Location: Galveston Bay
Posts: 365
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Most valuable information. Thanks everyone for this info.
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~Lynn~
I'm back after a long time with a cold torch. Torch Lit.... Life is goooood.....now!
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---> LE
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2010-09-08, 4:04am
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Senior Member
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Join Date: Jul 21, 2005
Posts: 1,897
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I suggest, take advantage of the perfect middle split, and let it be two cabs! Then go make more aquarium beads. Then again, it could be good practice on reheating an old bead, I just like the cab idea more..... especially when half the work is already done for you  !
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Ofilia Cinta
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2010-09-08, 11:01am
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honorary bead lady
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Join Date: Jan 14, 2008
Location: Mostly the doghouse
Posts: 5,180
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I'm with Ofilia make cabs!
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David
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2010-09-08, 11:20am
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Experimentalist
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Join Date: Nov 15, 2005
Location: Penryn, California
Posts: 6,758
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Quote:
Originally Posted by theglasszone
... "...then... here's the tricky part (so if you really love this bead maybe practice with another cold bead first)... cool the (exposed portion/handle part of the) mandrel with a damp cloth and remove the bead (still on the mandrel!) from the kiln. begin waving it faaarrr out in your flame slowly wafting/twirling the bead in and out of the flame to slowly reheat it evenly."...
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You rock... I was totally trying to figure out how she's going to cool the mandrel down, remove the bead, and then wave it through a flame. Ouch!
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2010-09-08, 11:25am
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Entropy increasing....
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Join Date: Nov 12, 2005
Location: In a box of paints
Posts: 25,098
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The problem with fixing these kinds of cracks is that if you do get the bead reheated they tend to divide along the crack when they begin to melt. You have to be really really careful and go really really slowly when you reintroduce it to the flame. When it's end to end like that it tends to just split open further. It's easier if it's only partly cracked. I've fixed a lot of cracked beads and this is the hardest kind of crack to fix. But what's to lose?
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"I am an artist… I am here to live out loud." Emile Zola
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2010-09-08, 1:20pm
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Ass-kicking Cephalopod
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Join Date: Jun 19, 2006
Location: Duh, Squidville
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I would probably make cabs too. Kevan is right - the edges of the crack will retract from each other when you heat it. If your clear is thick enough, it may be ok.
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DOG is my co-pilot
Cricket w/two 5 lpm oxycons - and sometimes a Minor.
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2010-09-08, 2:46pm
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Lampworkaholic!
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Join Date: Apr 22, 2008
Location: Cornelius, NC - because weather
Posts: 5,158
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Even if you manage to heal the crack, you will most likely have an optical line where the crack was. I think the risk of having half of a 900 degree bead go flying or worse explode outweighs the benefit of a repair. Chalk it up to experience and make another.
I know it hurts. I have a few of those half beads lying around myself, or worse yet, the ones where I picked up and used a clear short of the wrong CoE right as I was finishing a bead.
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"And all will turn to silver glass, a light on the water, grey ships pass into the west." Annie Lennox
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2010-09-08, 3:11pm
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Senior Member
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Join Date: Nov 01, 2006
Location: Nth NSW, Australia
Posts: 879
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Make it into a pendant for yourself, with a fixed bail so that only the good side shows.
That's what I'm going to do with my coral reef bead I just made that cracked.
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Nicole
Custard...it's just like hot icecream!
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2010-09-08, 3:18pm
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Senior Member
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Join Date: Jan 23, 2006
Posts: 1,229
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Quote:
Originally Posted by Ofilia
I suggest, take advantage of the perfect middle split, and let it be two cabs! Then go make more aquarium beads. Then again, it could be good practice on reheating an old bead, I just like the cab idea more..... especially when half the work is already done for you ! |
YES
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2010-09-08, 5:37pm
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burnin' glass just becuz
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Join Date: Apr 16, 2006
Location: Ottawa, Canada
Posts: 1,251
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Quote:
Originally Posted by theglasszone
Evelyn...please forgive me for adding to your awesome explanation...but I feel this should be clarified since the original poster is trying this for the first time:
"...then... here's the tricky part (so if you really love this bead maybe practice with another cold bead first)... cool the (exposed portion/handle part of the) mandrel with a damp cloth and remove the bead (still on the mandrel!) from the kiln. begin waving it faaarrr out in your flame slowly wafting/twirling the bead in and out of the flame to slowly reheat it evenly."
One additional suggestion:
While slowing moving the bead in the flame, try to avoid hitting the cracked area directly with the flame in the beginning of the re-heat. Flip the bead one side (where there is NO crack) and waft and wave it in the flame. Flip the bead 'round to the other side and continue to waft and waive it in the flame. Once these two uncracked sides begin to show signs of glowing, then slowly introduce the cracked areas into the flame. This will also better your chances of preventing it from cracking further.
Yeah? |
thanks for clarifying! i forget details sometimes... 
and for those saying give up/make cabs - it all depends on the bead. some i'll just dunk cuz it's not worth it - but if i've worked 1-1.5+hrs on a single bead and it cracks right near the end you bet i'm gonna try to save it!
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Evelyn - Carlisle Lucio w/ 8lpm EX-15
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Give ideas away - there are new ones underneath... Diane Vreeland
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2013-04-27, 10:25am
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Senior Member
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Join Date: Jun 26, 2005
Posts: 1,599
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Thanks, Y'all...heating up a rose with only platform cracks..got in trouble ignoring my dark grass advice.
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Before His throne is a sea of glass like crystal.
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2013-04-28, 4:56pm
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Senior Member
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I fire my cracked beads in the kiln (after they have been cleaned of bead release) and turn them into cabs by heating them up to 1450, then anneal and cool. I donate them to a local school where they turn them into rings or earrings.
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Barbara
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2013-05-01, 11:04am
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SCIENCE Teacher!
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I would add that there is some hazard to the heating up int he torch flame process. I have done it successfully and I have also had some explode hot glass all over my desk. It also depends on if you are absolutely sure all the glass is compatible. Incompatible glass can be "dramatic".
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