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Old 11-16-2017, 11:08 AM
Cecil McKenzie Cecil McKenzie is offline
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Join Date: Feb 2011
Location: Emporia, KS
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Thanks for the reply. i use just a set point controller. i usually leave it at temp for 2 hours or so after I am done. My annealer has six inch fiber walls and cools slowly. It parallels a Love controller set to cool down in 9 hours. This has worked for me for a long time with little problem. i used Zimmerman 74 until it became unavailable and switched to R 61.

I will try the cup tests to see if that tells me anything. I will also try a different batch of R 61.

I measured the weights. They are 3 to 3.25 inches in diameter. They all show stress but I think all the ones that have broken are 3.25 in diameter .
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