Originally Posted by
tungsten
I know some British builders used to "pin" the tubes in place in the lugs and then fire them in a kiln.
What is this "machine brazing" you speak of?
It's not complicated to get brass filler rings that fit within the joint during prep. Alignment can be handled by a few methods including pins or jigging. Torch application stations with timed cycles to melt/flow out the insert. If the process is done well there's very little clean up and less skilled people load tubes and filler inserts instead of handling the torches. IIRC Peugeot's lugless early 1980s frames were done this way as many others too. Andy