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Tips, Techniques, and Questions -- Technical questions or tips |
2013-07-19, 2:10pm
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Happy Inner Dragon
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Join Date: Dec 03, 2009
Location: Gold Coast, Australia
Posts: 6,129
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Encasing a Solid Gold Nugget?
Yep, I've been asked to encase a solid gold nugget in a shaped bead.
I really don't know whether to have a go at this or not. I'm sure the person doesn't have a stash of these things for me to practise on!
There doesn't seem to be a lot out there in googleland to help with whether it's a wise thing to try. Apparently this one is roughly 10x15mm, but I'm assuming it would also be roughly that thick. Seems awfully big.
Would it bubble up like silver wire, meaning you couldn't see it anyway?
Would it fume soft glass at soft glass temperatures?
Hell, would it just melt?
Would it just crack the glass anyway, given its density?
Would better results be possible with boro? In which case, I'd be referring the job on to someone with a bigger torch!
I'm hoping the collective wisdom of LE can help me with a decision.
Thanks, all
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2013-07-19, 4:49pm
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Senior Member
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Join Date: Apr 12, 2011
Location: Davison, MI
Posts: 833
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Maybe you could just make a vessel to drop it in? But if you want to send me a few nuggets to practice on.......lol!
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2013-07-19, 4:54pm
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Happy Inner Dragon
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Join Date: Dec 03, 2009
Location: Gold Coast, Australia
Posts: 6,129
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Howdy, Stranger How u doing?
LOL too funny. I did mention to the person that he'd doubtfully have practice ones
I'd suggested maybe add it as a charm to the heart bead he's after. And I've asked for a pic of the nugget on a ruler so I can get an idea of the size. At this point I'm thinking it might have to be quite a large bead. Even off-mandrel.
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2013-07-19, 6:46pm
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Senior Member
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Join Date: Apr 12, 2011
Location: Davison, MI
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Lol, I have been gone for a while, haven't I? I'm doing well, you?
A charm is a great idea. A nice dangly one.
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2013-07-19, 9:25pm
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Senior Member
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Join Date: Oct 16, 2012
Location: North of Palm Springs
Posts: 395
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I have several one oz nuggets in the bank...
The river bank, just not sure which river...
I do have some nuggets from my prospecting days though. Definitely not an oz...
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2013-07-19, 10:13pm
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It's all about the color.
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Join Date: Jul 03, 2005
Location: Texas
Posts: 1,894
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If the nugget's large enough, you have to think about COEs and the difference in Viscosity.
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Kay Powell
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2013-07-20, 4:32am
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Senior Member
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Join Date: Mar 14, 2012
Location: Bennington, VT
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not to mention, upon encasement the nugget will melt into just a blob. it won't keep it's nugget shape.
then you have to worry about coes if it's too big, sounds like a headache.
make a vessel, probably the safest bet.
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2013-07-20, 5:45am
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Unmedicated since '62
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Join Date: Jan 18, 2009
Location: Hunter Valley, Australia
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Gold is inert so it won't bubble like brass
Gold melts at about 1000deg
Glass melts t about 1500deg
So the nugget will melt before the glass
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Deb
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2013-07-20, 10:35am
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Happiness is....
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Join Date: Nov 21, 2005
Location: MI.
Posts: 1,110
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maybe drop it into a boro tube, melt it in, and encase it.
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2013-07-21, 11:59am
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Senior Member
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Join Date: Dec 24, 2011
Location: Big Island of Hawaii
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could you stick it to a mandrel using bead release, coat it with bead release to help protect it from heat, then build a hollow bead over it? That would leave a lot of bead release to clean out.
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2013-07-21, 1:14pm
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Happy Inner Dragon
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Join Date: Dec 03, 2009
Location: Gold Coast, Australia
Posts: 6,129
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Thanks, all. Some good ideas here and Raimond, too funny
I've decided it's a bit tricky for someone of my skill level, to attempt something of this size. I'd hate to ruin it and present him with a melted mess of gold and glass.
The boro tube idea is great, too, but probably a lot of work for my little torch. I did think of blowing a soft glass vessel, (wants a puffy heart shape), because he wants the heart in the style of my 'cave' beads, with windows to pretty things like Goldstone and silver glass amongst swirls of silvered Ivory on the outside. No way I could do silvered Ivory boro - or even fit the nugget through my 10mm blowpipe-sized top hole, for that matter
I'd put my concerns to the customer about the fuming, compatibility, melting point etc etc etc, and eventually we've come to an agreement on a method.
I suggested I could try to mimic a gold nugget with a Goldstone chunk, carefully encased. I have to see, though, whether I can still gravity-shape a heart without distorting the Goldstone. If I can, then we're sweet
Thanks again, all. Much appreciated.
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2013-07-22, 8:42am
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addicted to dichro
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Join Date: Jan 05, 2006
Location: Maine
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Or perhaps you could also mimic a gold nugget using gold leaf? Just an idea.
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2013-07-22, 12:42pm
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Happy Inner Dragon
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Join Date: Dec 03, 2009
Location: Gold Coast, Australia
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Thanks, Mandy. I might just have to. I tried a couple of Goldstone ones, but of course they just melted smooth because of the gravity-shaping eventually. I'd be no good at an aquarium bead
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2013-07-22, 10:35pm
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Senior Member
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Join Date: Jul 24, 2006
Posts: 149
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Di, Could you make a marble, use the gold as a murini , cover it with big glob of clear and build up to size - then wire wrap as pendant. As Deb said, you won't want direct flame contact, and you won't probably want to fume it either.
I think "Cosmo" encased some opals (Gibson)(SP) and made marbles.
Best of luck wishes,
Mandy
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2013-07-22, 11:17pm
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Happy Inner Dragon
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Join Date: Dec 03, 2009
Location: Gold Coast, Australia
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Thanks, Mandy. I've seen those gorgeous encased 'opals'. Aren't they lovley?
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2013-07-23, 4:46am
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formerly Marella
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Join Date: Feb 19, 2007
Location: London, Ontario, Canada
Posts: 638
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The melting point of gold is 1064Celsius....1947Fahrenheit
When I'm casting gold it actually takes quite a bit of time with my propane/oxy torch to melt the several grams I need for a piece.
If the nugget is relatively spherical it probably wouldn't melt but it will fume the glass, and the COEs aren't compatible so the risk of cracking the glass would be the main issue.
A glass vessel that you could drop the nugget into would be the best idea.
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2013-07-23, 6:32am
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Hobby Junkie
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Quote:
Originally Posted by spotty dots
I think "Cosmo" encased some opals (Gibson)(SP) and made marbles.
Mandy
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I've made a couple if pieces with the Gilson opals. They are surprisingly easy to work with. I just smooshed them in where I wanted them to be and stuck a blob of clear on top. Easy peasy.
The gold would be rough since it would go molten before the glass melted.
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2013-07-23, 8:29pm
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Happy Inner Dragon
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Join Date: Dec 03, 2009
Location: Gold Coast, Australia
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Thanks, everyone for your info. It will all be valuable down the track, even though I've not had a go, having opted for an all-glass piece.
Very much appreciated
Here is what's just been approved:
Will be wired up into a pendant, and will have matching earrings, without the gold. Just the blue aventurine ribbon and silvered Ivory.
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2013-07-24, 7:32pm
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Lover of Life
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Wow that's lovely!
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2013-07-24, 7:34pm
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Happy Inner Dragon
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Join Date: Dec 03, 2009
Location: Gold Coast, Australia
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Thanks, Becky I like it, too.
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2013-07-25, 1:47am
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Senior Member
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I like the idea of a vessel with the nugget in it. Maybe make it where it's kind of like the ship in the bottle thing, where people wonder how you got it in there....could easily be done with boro.
Oh, just saw the post on what you decided....can't see the image on this computer, it's just an "X". Oh well I'm sure it will be lovely!
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Patti T.
Fullerton, CA
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2013-07-25, 1:56am
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Happy Inner Dragon
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Join Date: Dec 03, 2009
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Lol Patti. Bummer you can't see it. But yeah I gave the option of a vessel, and I have the right size tubing. I'm glad the bead option was what we ended up taking, though.
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