Re: [CR] Broken Fixed-Cup Removal at SBK

(Example: Framebuilders:Jack Taylor)

Date: Wed, 28 Oct 2009 13:32:19 +0100
From: "M-gineering" <info@m-gineering.nl>
To: CR List <Classicrendezvous@bikelist.org>
References: <d50.5c223c75.381934bc@cs.com>
In-Reply-To:
Subject: Re: [CR] Broken Fixed-Cup Removal at SBK


Carb7008@cs.com wrote:
> Here in Sacramento we have a volunteer bike-biz catering to folks. A
> gentleman came-in tonight with a loose crank,which upon removal of BB, the fixed
> cup had circumferentially broken in-two such that about 3/4" of the inner
> portion of cup remained threaded in the shell about 1/4" deep. Every effort to
> remove, including un-screwing, cutting with hacksaw, notching with file,
> prying with screwdriver, failed to remove hardened (why do you think they call
> them "fixed"?) race.
>
> I doubt a cold chisel, which we didn't have, would have cut-through. A
> Dremel tool may have worked if we could have gotten the cutting-wheel inside
> the BB shell. Needless to say, the gentleman walked his OT bike home. Any
> ideas short of torch or liquid nitrogen embrittlement?
>

Mig welder.

-- mvg

Marten Gerritsen

Kiel Windeweer
Netherlands