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Old 2019-01-11, 7:00pm
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Speedslug Speedslug is offline
Phill
 
Join Date: Mar 21, 2009
Location: Winnebago, MN
Posts: 2,489
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Perhaps they are too small to hold the heat they need between the torch and the kiln.

I tended to forget that the mandrel will suck the heat out of the center of the bead and unless I was religious about putting the bead in the flame at the end for what a lot of instructors called "insurance heat".

When they are real small even 5 seconds between flame and kiln can be enough to install stress that won't show up until you begin to clean them.

Another source of stress is that your kiln is not warm enough or you are not letting the bead soak long enough in the annealing temp range for the internal stress to even out.

Cooling them too fast is yet another way to get these kinds of breaks so double check you cool down schedule of your kiln.
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