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2013-04-24, 5:44am
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Now part of the Dark Side
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Join Date: Jul 02, 2010
Location: North Central PA
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Making a Circle
I thought I'd ask instead of experiment. I need to make several circles of various sizes from 5mm/6mm clear boro rod. I've thought of several way to do this but I'm leaning towards measuring the amount of rod needed (circumference = Pi * Diameter), and free form it using the excess rod as a handle, then melting the handle off when finished. Circle diameter will vary between 2.5 and 4 inches, they do not need to be perfectly round.
Thanks
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Roy
Hot glass does not crack.
Unless it is glowing and drippy, hot glass looks like cold glass.
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2013-04-24, 5:55am
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Senior Member
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Join Date: Oct 06, 2008
Location: SE PA
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I was thinking maybe a bracelet mandrel. Though if you don't have to make alot ... I'd probably free form it.
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Laura
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2013-04-24, 6:56am
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Join Date: May 23, 2006
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Cut a piece of rod and punty it up in the middle of the cut piece. Heat gently and form a loop and fuse the ends together. Knock it off in a marble mold or something like that so that you can fire polish the punty mark.
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Cynthia
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2013-04-24, 11:24am
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Dakine glass man
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Join Date: Apr 19, 2008
Location: Maui
Posts: 453
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This way doesn't use rod, but does yield perfect circles.
Flame taper a piece of tubing, then cut cross sections with a ring saw. Flame polish or cold polish and boom!
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Lampwork by John Lindquist
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2013-04-24, 2:28pm
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sorcerer
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Join Date: Nov 13, 2005
Location: kangaroo island
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If you wrap a 6mm rod around a 25mm graphite rod you can wind a coil and cut many circles from it, to start wire a small piece of 6mm onto the graphite rod to stick onto then just wrap away until you get to the end of the rod, when it's all cool snip the rings with nippers and then holding them with tweezers join them up, this is a good way to make a chain.
B
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Kangaroo Island,walking on the dark side in paradise.
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2013-04-24, 2:48pm
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Member
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Join Date: Sep 27, 2010
Posts: 64
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i agree with castaway ,you can just look around for something to coil the rods around cut where you want and lay on a graphite plate heat with a soft flame till it lays flat and just seal the ends togather by heating between the ends while gently pressing the sides togather. in the shop i used to work at we had a jar of aquadag { graphite suppended in a liquid } and that made any size of boro rod or tube a suitable mandrel to wrap around .
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2013-04-24, 3:28pm
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hyperT
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Join Date: Jan 31, 2013
Location: San Antonio, Texas
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Ribbon Burner
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2013-04-24, 5:01pm
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Dakine glass man
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Join Date: Apr 19, 2008
Location: Maui
Posts: 453
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I like castaways advice too. It's how they mass produce bengals in India.
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Lampwork by John Lindquist
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2013-05-03, 8:25am
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Senior Member
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Location: Beautiful Colorado
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Quote:
Originally Posted by castaway
If you wrap a 6mm rod around a 25mm graphite rod you can wind a coil and cut many circles from it, to start wire a small piece of 6mm onto the graphite rod to stick onto then just wrap away until you get to the end of the rod, when it's all cool snip the rings with nippers and then holding them with tweezers join them up, this is a good way to make a chain.
B
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Brilliant! Thanks bunches.... been wanting to do chainmaille...... I've done it with soft glass for fusing but never thought about boro... slaps forehead!
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Leslie
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2013-05-03, 9:02am
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Administrator
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Join Date: Sep 18, 2004
Location: Mesa, AZ
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I can't seem to get the hang of cooling on a rod and nipping the circles. Whenever I do that I seem to break them instead of nip individual rings. I make them each individually. I guess I need to try again with coiling. Where can I get a large graphite rod?
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CorriDawn
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2013-05-03, 9:30am
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Now part of the Dark Side
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Join Date: Jul 02, 2010
Location: North Central PA
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Once my kiln is operational again, it melted my work this AM, I think I'm going to use Cynthia's suggestion. finding a 4 inch diameter graphite rod might be difficult.
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Roy
Hot glass does not crack.
Unless it is glowing and drippy, hot glass looks like cold glass.
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