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Old 2013-10-13, 3:01am
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wendbill wendbill is offline
More ideas than talent
Join Date: Sep 17, 2005
Location: Melbourne, Oz
Posts: 2,565

There's a rule of thumb which used to be quoted, and of course I can't quite remember it...

Something about the thickness of the glass on either side of the mandrel needs to be at least as thick as the mandrel's diameter to avoid breakage. Possibly twice as thick?

Maybe someone else remembers it?

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