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#1
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cable stop strength
Hi all,
I just repaired the rear derailleur cable stop that broke off from my carbon fiber chainstay, but I don't know if it will hold in the long run. Is there a standard way to test this? How do frame builders do it? Thanks, Francesco |
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#2
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cable stop strength
Francesco Devittori wrote: Hi all, I just repaired the rear derailleur cable stop that broke off from my carbon fiber chainstay, but I don't know if it will hold in the long run. Is there a standard way to test this? How do frame builders do it? Thanks, Francesco How was it originally attached? How did it become detached? Was there any damage to the chainstay? How did you re-attach it? To better serve you, D'ohBoy |
#3
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cable stop strength
D'ohBoy wrote: Francesco Devittori wrote: Hi all, I just repaired the rear derailleur cable stop that broke off from my carbon fiber chainstay, but I don't know if it will hold in the long run. Is there a standard way to test this? How do frame builders do it? Thanks, Francesco How was it originally attached? How did it become detached? Was there any damage to the chainstay? How did you re-attach it? To better serve you, D'ohBoy The cable stop is a square alu thing. It was fixed with a little screw and very little glue (the bike is a first-generation C40). I was able to drill out the broken screw, then attach the stop with a similar screw and a good amount of bi-component epoxy glue (called Araldit, I don't know if it's a known brand -it is here). I guess the glue is what keeps things together, I don't think the screw alone is strong enough to keep the cable stop in place under force. A good thing is that the contact surface is relatively large and the shape of the cable stop is a bit rounded and matches the chainstay. Before gluing I roughed both surfaces with sandpaper and cleaned them well. It's now sitting for 24 hours, but already after a couple of hours I was not able to move the cable stop with all the force of my hand. What I'm most concerned is the long term durability (also cold conditions/etc). I don't want that it detaches in the middle of a race... |
#4
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cable stop strength
Francesco Devittori wrote:
D'ohBoy wrote: Francesco Devittori wrote: Hi all, I just repaired the rear derailleur cable stop that broke off from my carbon fiber chainstay, but I don't know if it will hold in the long run. Is there a standard way to test this? How do frame builders do it? Thanks, Francesco How was it originally attached? How did it become detached? Was there any damage to the chainstay? How did you re-attach it? To better serve you, D'ohBoy The cable stop is a square alu thing. It was fixed with a little screw and very little glue (the bike is a first-generation C40). I was able to drill out the broken screw, then attach the stop with a similar screw and a good amount of bi-component epoxy glue (called Araldit, I don't know if it's a known brand -it is here). I guess the glue is what keeps things together, I don't think the screw alone is strong enough to keep the cable stop in place under force. A good thing is that the contact surface is relatively large and the shape of the cable stop is a bit rounded and matches the chainstay. Before gluing I roughed both surfaces with sandpaper and cleaned them well. It's now sitting for 24 hours, but already after a couple of hours I was not able to move the cable stop with all the force of my hand. What I'm most concerned is the long term durability (also cold conditions/etc). I don't want that it detaches in the middle of a race... should be stronger than the original. unless you have derailleur problems that cause significantly excess tension, it should be fine. |
#5
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cable stop strength
jim beam wrote:
Francesco Devittori wrote: [...] I was able to drill out the broken screw, then attach the stop with a similar screw and a good amount of bi-component epoxy glue (called Araldit, I don't know if it's a known brand -it is here). [...] should be stronger than the original. unless you have derailleur problems that cause significantly excess tension, it should be fine. Thanks! This gives me some peace of mind. I can now sleep better :-) Francesco |
#6
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cable stop strength
On 10 Dec 2006 08:28:41 -0800, "Francesco Devittori"
may have said: D'ohBoy wrote: Francesco Devittori wrote: Hi all, I just repaired the rear derailleur cable stop that broke off from my carbon fiber chainstay, but I don't know if it will hold in the long run. Is there a standard way to test this? How do frame builders do it? Thanks, Francesco How was it originally attached? How did it become detached? Was there any damage to the chainstay? How did you re-attach it? To better serve you, D'ohBoy The cable stop is a square alu thing. It was fixed with a little screw and very little glue (the bike is a first-generation C40). I was able to drill out the broken screw, then attach the stop with a similar screw and a good amount of bi-component epoxy glue (called Araldit, I don't know if it's a known brand -it is here). I guess the glue is what keeps things together, I don't think the screw alone is strong enough to keep the cable stop in place under force. A good thing is that the contact surface is relatively large and the shape of the cable stop is a bit rounded and matches the chainstay. Before gluing I roughed both surfaces with sandpaper and cleaned them well. It's now sitting for 24 hours, but already after a couple of hours I was not able to move the cable stop with all the force of my hand. What I'm most concerned is the long term durability (also cold conditions/etc). I don't want that it detaches in the middle of a race... I'd say it should be good for a couple of years at least, as long as the aluminum's surface was not contaminated with anything that would eventually degrade the bond. There's a good chance that it'll last a long as the chainstay. -- My email address is antispammed; pull WEEDS if replying via e-mail. Typoes are not a bug, they're a feature. Words processed in a facility that contains nuts. |
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