Re: [CR]More about pins in frames

(Example: Framebuilders:Pino Morroni)

In-Reply-To: <8C810F6E69F9862-D38-4897@MBLK-M14.sysops.aol.com>
References: <70e14d4c0603080623k6b808d2eocec4f705a0233868@mail.gmail.com> <8C810E63F618415-153C-13A09@MBLK-R09.sysops.aol.com> <440F0F7C.5090009@df.unipi.it>
From: "Steve Leitgen" <sleitgen@charter.net>
Subject: Re: [CR]More about pins in frames
Date: Wed, 8 Mar 2006 15:53:21 -0600
To: oroboyz@aol.com
cc: servadio@df.unipi.it
cc: servadio@df.unipi.it

To answer the question on whether you remove the pin after brazing. No, It's left in. The pins in the head, down and seat joints are impossible to reach and the BB ones just plain difficult. You file the outer end flush with the lug. If you want to know if your frame is pinned, stick your finger (carefully, ouch!) in the BB and up one of the tubes. It will be hard to miss.

Steve leitgen La Crosse, WI

On Mar 8, 2006, at 12:40 PM, oroboyz@aol.com wrote:
> Caro Sergio:
>
> << Why haven't builders, since they have not as far as I know,
> reinforced glued carbon-aluminum or carbon-carbon joints with pins?
> After all, it is a well known fact that 'superglue' has often not
> been so SUPER!
>
> P.s. Please, don't tell me that by drilling a tiny hole I would
> destroy fibers so badly
> as to cause even worse failures. I just don't believe it. >>
>
> I don't think that "pins" would hurt a carbon frame or aluminum
> frame, providing that adequate bonding agent (glue in these cases) was
> present in the joint.
>
> BUT (and this makes this message vintage pertinent & On Topic) those
> pins really don't reinforce anything, in steel or any other frame
> building material. They just keep the tubes in their appropriate place
> until the actual bonding (brazing, gluing or whatever) takes place.
>
> After their job is done, the pins are redundant and hence Angel's
> question asking if they were removed by builders after the building
> process.
>
>
> Dale Brown
> Greensboro, NC USA
>
>
> -----Original Message-----
> From: Sergio Servadio <servadio@df.unipi.it>
> To: oroboyz@aol.com
> Cc: classicrendezvous@bikelist.org
> Sent: Wed, 08 Mar 2006 18:08:12 +0100
> Subject: Re: [CR]More about pins in frames
>
> Maestro Richard Sachs correctly reminds me & I paste below:
>
> >
> > "Pins are not the surrogate for fixtures unless you go back to the
> > Drysdale era!!!
> > Builders pin frames in sophisticated fixtures and then braze free.
> ...
>
> At the risk of being scolded for living in Modern Ages here is a
> question about pins that has been bugging me for a long time
> .
> Why haven't builders, since they have not as far as I know,
> reinforced glued carbon-aluminum or carbon-carbon joints with pins?
> After all, it is a well known fact that 'superglue' has often not
> been so SUPER!
>
> Sergio
> Pisa
>
> P.s. Please, don't tell me that by drilling a tiny hole I would
> destroy fibers so badly
> as to cause even worse failures. I just don't believe it.
> _______________________________________________
>
> _______________________________________________