Re: [CR] wisdom of drilling the stem for brake cable?

(Example: Framebuilders:Alberto Masi)

Date: Fri, 20 Nov 2009 16:33:08 +0100
From: "M-gineering" <info@m-gineering.nl>
Cc: <classicrendezvous@bikelist.org>
References: <OF0DC27290.F07E5BF1-ON85257674.000ABAF4-85257674.000B1C6D@LocalDomain> <E02E960FA9114FACA827622299AF708C@ARSPC> <195fa6980911192013l2c9352a3o3bbca1393bab76bc@mail.gmail.com> <93554B3C9A2A4F01896D86FD90E996E8@kevinPC> <a06230947c72c5d82053a@[67.100.222.170]>
In-Reply-To:
Subject: Re: [CR] wisdom of drilling the stem for brake cable?


Jan Heine wrote:
>
> It all depends. The hole to pass the brake cable is very small, so you
> are removing hardly any material. A round hole doesn't introduce stress
> risers, either.
>

I think you might want to rephrase that statement!

Depending on the geometry and the material , drilling a hole reduces the permissible stress by 1.3 or so. You might get away with it as the stress in the middle is perhaps lower than in the clamp area -- mvg

Marten Gerritsen
Kiel Windeweer
Netherlands