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PostPosted: Wed Jan 16, 2013 6:33 pm 
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I have a 2005 Scott CR1 on which the bottom bracket aluminum insert (on the crank side) has came apart. It appears that the aluminum insert was glued to the carbon fiber bottom bracket shelf.

I think this can be easily repaired with epoxy. That being said, I wanted to know what type of epoxy I should use to glue aluminum to carbon fiber ?

Here's the part that came apart (insert pointed by the arrow):
Image

Cheers !


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Posted: Wed Jan 16, 2013 6:33 pm 


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PostPosted: Tue Feb 26, 2013 8:24 pm 
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Can someone confirm if this epoxy glue will do the job ? (PermaPoxy)

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PostPosted: Tue Feb 26, 2013 11:28 pm 
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There is a lot of force going into the shell. To do it properly the aluminium shell will need to be removed and reinstalled with something like 3M dp 470, but it will be a major job to get the shell out as i believe it is a two piece shell inserted from each side and glued together at the joint. Anything else you do will be a band aid solution.
Bill


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PostPosted: Wed Feb 27, 2013 1:29 pm 
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Thanks Progretto.

I was able to completely pull the insert on the drive side (the one that came apart).
For the 3M glue, are you referring to this one : http://www.shop3m.com/3m-scotch-weld-ep ... 36qpz.html. Didn't find anything about the DP470.


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PostPosted: Wed Feb 27, 2013 4:40 pm 
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This happened to my friends CR!, I believe his was a 2005 as well. He tried the epoxy method but didnt quite trust the adhesive. He ended up contacting scott and they sent him a brand new CR1. Have you tried simply looking to get a replacement?


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PostPosted: Wed Feb 27, 2013 5:57 pm 
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The frame is not covered by the warranty anymore.
I'll probably try and see how it holds.


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PostPosted: Thu Feb 28, 2013 6:35 pm 
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I've been working with carbon fiber for many years now...as you may know from the carbon items I produce for bicycles...Veloflyte.
Getting a strong bond to metal relies heavily upon the surface preparation of the metal. In your case however since the metal edge to be bonded to is hidden, the best thing you can do is choose an epoxy with the best bonding properties. The epoxy you have pictured is very low quality. I would not recommend using that type and brand. I do recommend you use Devcons Plastic Steel epoxy. It comes in a similarly sized container and will bond to metal much better than the epoxy you have in the picture.
The picture of your frame does not show the problem at all. I'm not sure how wide the "gap" is.


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Posted: Thu Feb 28, 2013 6:35 pm 


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PostPosted: Thu Feb 28, 2013 11:28 pm 
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Sorry, mean't dp 420.


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