Re: [CR] swiss bb tap help! Check for protruding tubes...

(Example: History:Ted Ernst)

Date: Tue, 27 Oct 2009 14:13:11 -0800
From: "verktyg" <verktyg@aol.com>
To: Hugh Thornton <hughwthornton@yahoo.co.uk>, <Classicrendezvous@bikelist.org>
References: <977357.79696.qm@web25902.mail.ukl.yahoo.com>
In-Reply-To: <977357.79696.qm@web25902.mail.ukl.yahoo.com>
Subject: Re: [CR] swiss bb tap help! Check for protruding tubes...


On the subject of shallow tapped BB threads, I've run into problems several times where the seat or down tubes were poorly mitered and protruded into the BB. In most cases BB threads are tapped deep enough to cut through or bend back the protrusions but not always.

A few months ago I was working on a frame built in the early 60s. The later model replacement cups I was installing had longer thread lengths than the originals that were in the frame. Even though I chased the threads with VAR BB taps I still had to grind back the protrusions to get the fixed cup to go all the way in.

So check the BB for protruding tubes.

Chas. Colerich Oakland, CA USA

Hugh Thornton wrote:
> This reminds me that I was going to ask if French BB thread taps are still available anywhere. Does anybody know as I rather desperately need to retap a BB?
>
> With respect to Charles difficulties threading a cup in all the way, I have had this happen to me when the BB was only tapped enough to take a relatively shallow cup and I had to tap it further to get a deeper cup in. In this case, if I could not get the right tap, I would be inclined to grind down the first few threads on the cup rather than force it in - I would rather modify an almost expendable cup than risk any damage to the frame.
>
> Hugh Thornton
> Cheshire, England
>
> --- On Tue, 27/10/09, Charles Andrews wrote:
>
> So, in the ongoing saga of this Mondia Special frame I bought in a moment of madness..I did find a swiss bb fixed cup (thanks Richard!)
>
> But, now, after much elbow-grease (basically, re-tapping the worn threads with the cup), I simply cannot get the cup to go on the last two mm or so. I've been using the usual campagnolo cup-wrench, not the big shop-tool version. I know that wrench is pretty much useless for anything more that a snug cup, but I have managed to use it to get the cup in almost tight.
>
> What I really need is to find someone--or a shop--that still has swiss taps.. Any suggestions?? Anyone know of a shop or person who would have a swiss tap so I can do this job right? I really don't want to break out my VAR-copy cup tool and force the thing in, although I will if I can't find someone with the right tap.

>

> Thanks!

>

> Charles Andrews

> Los Angeles