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Tips, Techniques, and Questions -- Technical questions or tips

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Old 2021-09-27, 7:22pm
sigourneyanderson sigourneyanderson is offline
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Join Date: Sep 27, 2021
Posts: 1
Default Barrel beads cracking

Hi everyone,

Does anyone have the problem of barrel beads cracking on the ends after tumbling them?

This started fairly recently - I have been tumbling almost all of my beads for some time and tend to put 60 or 70 beads of all shapes and sizes in the tumbler at the same time.
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Old 2021-09-27, 8:27pm
ESC ESC is offline
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Join Date: Feb 02, 2010
Posts: 2,897

A barrel is a pretty stable shape. I think I'd try more insurance heat on the ends of the beads first.
Soft glass on a Minor/concentrator since 1996
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Old 2021-09-27, 11:18pm
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Eileen Eileen is offline
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Join Date: Oct 11, 2010
Location: Florida
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I picture might help too, sometimes there is a visual clue.
My current "hot" fantasy involves a senior discount on glass & tools!
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Old 2021-09-28, 6:07am
Robin Passovoy Robin Passovoy is offline
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Join Date: Dec 31, 2009
Posts: 504

That's usually a thermal-shock problem, where the ends cooled faster than the middle. I had a lot of trouble with that, particularly on bicone beads before I learned to make extra sure that I'd heated the whole bead evenly before putting it in the annealer. It's very easy to forget the ends, particularly if you've spent a lot of time on decorating the middle.
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Old 2021-09-28, 8:46am
LarryC LarryC is offline
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Join Date: Mar 07, 2011
Location: Northern California
Posts: 2,023

Lets start calling this what it is. Its a failure in annealing. Of course if you dont box the piece with even heat throughout, it is much harder to reduce the stress overall. Lots of factrs can lead to this mode. This is why in the furnace glassblowing world we take great pains to flash the whole finished piece to equalize the heat before boxing.
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Old 2021-10-05, 2:48pm
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Sue in Maine Sue in Maine is offline
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Join Date: Jun 14, 2005
Location: The Rocky Coast State!
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Which way is it cracking? Through the middle or lengthwise?

Sue Walsh
The past is history,
The future is a mystery
and the present is a gift.
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