Re: [CR]Re: More about pins in frames

(Example: Events:Cirque du Cyclisme:2002)

Date: Thu, 09 Mar 2006 13:52:55 -0600
From: "John Thompson" <JohnThompson@new.rr.com>
Organization: The Crimson Permanent Assurance
To: classicrendezvous@bikelist.org
Subject: Re: [CR]Re: More about pins in frames
References: <70e14d4c0603080623k6b808d2eocec4f705a0233868@mail.gmail.com> <8C810E63F618415-153C-13A09@MBLK-R09.sysops.aol.com> <440F0F7C.5090009@df.unipi.it> <8C810F6E69F9862-D38-4897@MBLK-M14.sysops.aol.com> <440FEC30.2070600@df.unipi.it>
In-Reply-To: <440FEC30.2070600@df.unipi.it>


Sergio Servadio wrote:
> I beg to differ here. Any joint that would tend to unglue cannot but
> profit by having an added mechanical impediment to that. The
> improvement depending on obvious details.

I don't think a pin -- whether it be placed in carbon fiber, aluminum, or steel -- is going to do much to prevent joint separation in a completed joint.

The pins are there for one reason only: to hold the tubes in place until the real bonding material (silver or brass in the case of steel frames) can be applied. A pin acting as a structural component of the completed joint will be a terrific stress raiser -- especially in material like carbon fiber, which is not designed to handle that type of loading.

--
John (john@os2.dhs.org)
Appleton WI USA