While I understand about the advisability of relieving these stress risers on the Nouvo/Super Record cranks, since they are anodized and the process of filing and sanding removes the protective and attractive anodization I would think that rather than leaving these areas exposed the cranks would then have to be re-anodized or carefully and thoroughly polished a la Mexico cranks. While polishing is attractive, is this as durable as anodizing? I wouldn't have thought so...
Edward Robert Brooks Managing Director Edward Roberts International Auctioneers of the Fine and Rare 1262 West Winwood Drive Lake Forest, Illinois 60045 Phone- 847.295.8696 Facsimile- 847.295.8697 Email- ebrooks@eriwine.com Website- http://www.eriwine.com
-----Original Message----- From: classicrendezvous-bounces@bikelist.org [mailto:classicrendezvous-bounces@bikelist.org] On Behalf Of gpvb1@comcast.net Sent: Wednesday, January 11, 2006 1:56 PM To: classicrendezvous@bikelist.org Subject: Re: [CR] Campy NR early crankset
Date: Wed, 11 Jan 2006 08:54:53 -0800 (PST) From: Rachael Ramos <ooki1998@yahoo.com> To: classicrendezvous@bikelist.org Subject: [CR] Campy NR early crankset
Hi all, I've read about the stress cracks that plague these cranksets and I think I read somewhere about a possible help. It said that you take a round file to the "sharp" edges between the crankarm and the "star" and round it over a bit. Does anyone know if this works? It almost seems counter-intuitive to eliminate metal from an area that suffers stress cracks.
thanks -George
Yes, it generally works, assuming that the crack is small (or not there yet), and you get all of it removed. What you are doing is trying to stop crack propagation (or avoid it pre-emptively in the case of one that isn't cracked yet). You are eliminating the sharp edges in those areas, and making them smooth, radiused transitions.....
This is just like aircraft fuselage repair where they make modifications (drill holes, etc.) to stop a crack from propagating (progressing). They don't often replace the (aluminum) part, unless necessary. You would freak if you knew how many thousands of cracks there were in the average DC9 fuselage!
But these are all secrets, so don't tell anyone. ;-)
Greg Parker
Dexter, Michigan
http://www.bicycleclassics.com