Re: [CR]Built-up lugs and heating joints


Example: Framebuilders:Dario Pegoretti

To: OROBOYZ@aol.com
Cc: heine@mindspring.com, classicrendezvous@bikelist.org
Date: Sat, 27 Apr 2002 12:11:28 -0400
Subject: Re: [CR]Built-up lugs and heating joints
From: Richard M Sachs <richardsachs@juno.com>


i think too much is being made of this because: they made their lugs using two pipes-joined-together at the correct 'angle', either to have lug angles that were outside the range of what pre-existed, and/or to give the artisan a canvas on which different shoreline treatments could be carved. the operation entails some basic welding. the 'filetting' everyones is hot on is <just> some braze material added over the weld bead-because it creates a more beautiful 'flow' from one tube to the other. it _has_ to be added because to have made lugs which have the welds showing over the tube mitre area would not have been the accepted aesthetic. all that they were doing was to create the illusion that the lug was one piece, not created from parts. fwiw, the pic of the sandblasted joint on page 108 better illustrates the point. had they created the same lug designs from blanks, essentially cutting only the shoreline, there'd have been no need or reason to build up some brass and then radius it in the 'crutch' area of the lug. ca' m'est egal. e-RICHARD dans l'atelier

On Sat, 27 Apr 2002 11:59:05 EDT OROBOYZ@aol.com writes:
> In a message dated 4/27/2002 11:53:55 AM Eastern Daylight Time,
> heine@mindspring.com writes:
>
> << in the Japanese René Herse book, it
> shows on page 107 a lug that looks slightly built-up, before
> brazing.
> So the joint gets heated only once. I will try and find out whether
>
> Singer does it the same way... >>
>
> No fair!
> I haven't gotten my book yet! :)
>
> So they must first brass-fillet and shape the lug and then silver
> braze the
> joint? How strange! I can't wait to see that!
>
>
> Dale Brown
> cycles de ORO, Inc.
> 1410 Mill Street
> Greensboro, NC 27408
> 336-274-5959
> fax 336-274-6360
> http://www.cyclesdeoro.com
> http://www.classicrendezvous.com