Having sold & refinished a number of these various Carlton~Raleighs, that copper tacking was used on the International, Gran Sport, Competition & down. I do not think the Pro models ever had that technique used on them. The copper tacking was used as early as 1972 though....
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-----Original Message----- From: Marcus Coles <marcoles@ody.ca> To: CLASSIC RENDEZVOUS <classicrendezvous@bikelist.org> Sent: Sat, 22 Nov 2008 7:21 pm Subject: Re: [CR]'72 Carlton Pro - Pinned Frame. Should I Be Surprised?
Mike Short wrote:?
> Hello All,?
>?
> I have a 1972 Carlton Professional which I have not ridden for a while as it?
> is a little too big. My dad bought it new back in the 70s and because of?
> sentimental reasons I cannot sell it. So today I decided to repack the?
> bottom bracket and as I am accustomed, stuck my finger up the tubes and to?
> my surprise found that the frame was pinned. I thought that the Raleigh Pros?
> and the Carlton Pros were mass produced (albeit in Worksop) and this?
> building technique would not have been employed. Any ideas? Serial # is: A?
> 55 65?
>?
> Mike Short,?
> Austin Texas,?
> USA.?
>?
>
According to The Custom Bicycle by Michael J. Kolin and Denise M. de la
Rosa (1979), admittedly later than the subject bicycle.?
?
"At the Worksop factory, only the track bicycles and the?
custom bicycles are individually brazed on an open hearth. All?
the other bicycles are ring-brazed on a specially designed?
machine."? ?
"The tubes for the regular production bicycles are not pinned before the brazing operation;?
they are coppered (a quick tack-brazing operation using copper instead of?
brass) to insure proper alignment. Copper is used because it melts?
at a higher temperature than brass. When the frame is ring-brazed?
with brass, the tubes will stay in place since the brass will flow?
before the copper reaches its melting point"? ?
Perhaps the production techniques changed or particular bicycle is a custom.? ?
Marcus Coles?
London, Ontario, Canada.? ?
PS. The quotes were from a .pdf copy of the book posted on the www, but I do actually own a copy of the book.? ?
?
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