Perhaps Hilary could post the text that he prepared for the CB Olympic Sprint (?) in a Design Classics article for Cycling Plus. I believe that he detailed the bilaminate construction sequence in that article and that the "lugs" (half-lugs?) were brazed to each of their respective tubes and then subsequently the two tubes were joined by fillet brazing the subassemblies together.
I don't recall if alternate brazing materials were used. Certainly seems as though this would be quite tricky if only brass were used. I suppose that fillet brazing with silver is also a challenge even if the initial step was performed with brass.
Charlie Young
Honeybrook, PA
> > Perhaps Bi-laminate is not the correct term. The bottom
> > bracket shell is clearly not a casting or pressed lug.
> > It is obviously made of five separate pieces of tubing
> > that have been filet brazed together. If not bi-laminate
> , what do you call that?
> Hypothetically, if the pieces of tubing were brass brazed
> together and then the whole joint was silver brazed,
> wouldn't it be a tri-laminate? Seriously though,
> bi-laminate sounds mostly like a marketing term. I can't
> imagine any framebuilder in this country using that term.
> I think they'd say the lugs were hand made. Regardless of
> the semantics, making your own BB shell would be a great
> deal of work even if it was laminated.
> Curt Goodrich
> Minneapolis, MN