Old 02-07-21, 11:51 AM
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Originally Posted by juvela View Post

there is one scene where a workman appears to be doing nothing as he watches three frames on a work bench

they sit upright with their bottom bracket shells between two bricks

then he seems to check that one is "done" and removes it

wondering if this might represent hearth brazing of the joints at the bottom bracket shell

perhaps there is a furnace going beneath the "work bench"...

perhaps a framebuilder reader could comment...

Yes, at 3:59 that is hearth brazing, The bricks control the blast of heat from a hearth. I think I saw a brass rod that he is feeding into the joint.
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