If you are bringing on the fuel gas low and slowly adding on the oxygen, it could be that there's just enough fuel gas bleeing back into the oxygen chamber to cause it to ignite and pop. Just run your fuel gas flame out a little further and turn your oxygen on faster.
If it pops and your flame goes out, I would suspect premixing - and that is a problem.
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Kimberly
working glass since 1990 - melting it on a torch since 2002
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