chris H Posted October 31, 2013 Report Share Posted October 31, 2013 I have some try all carbons with a jaf insert/extender. The forks have seen no more than six hours of riding when to my shock the insert has started to release it's self. It wasn't enough to just remove it, I had to stick in in a vice and realy force it to come out. As far as I'm aware it was expoyd in, would anyone recommend any other bonding agents that could potentially be even harder? I know there is liquid metal and have witnessed it set, amazing stuff. Any help or tips is much appreciated. Quote Link to comment Share on other sites More sharing options...
*gentlydoesit Posted October 31, 2013 Report Share Posted October 31, 2013 No help, but would really like some pics Quote Link to comment Share on other sites More sharing options...
forteh Posted October 31, 2013 Report Share Posted October 31, 2013 Hard one to state, epoxy by its nature isn't particularly flexible, the steerer tube of the forks on the other hand is. Anything epoxied in there is likely to break loose eventually because it isn't actually bonded into the carbon itself. You could re-epoxy it with some araldite or similar but the same thing is likely to happen again. What area of the extender had been bonded? Possible that is was only partially stuck which would cause it to fail much faster. Quote Link to comment Share on other sites More sharing options...
chris H Posted October 31, 2013 Author Report Share Posted October 31, 2013 Quote Link to comment Share on other sites More sharing options...
casualjoe Posted October 31, 2013 Report Share Posted October 31, 2013 Crestomer is the strongest stuff I know of, it can handle a bit of flex so would be worth a try. Quote Link to comment Share on other sites More sharing options...
Ash-Kennard Posted October 31, 2013 Report Share Posted October 31, 2013 Loctite Henkel also recommended an application fit adhesive for bonding Carbon fibre to aluminium, this adhesive is Loctite Hysol 9461, this adhesive is a two part epoxy resin mixed at a 1:1 ratio and provides excellent peel strength, excellent tensile shear strength, impact and fatigue resistance, has a medium working life and curing can be accelerated with heat. But bonds most to a greater strength when left to cure at room temperature, full cure time is 3 days at 22 degree C but should be left for 7 days if going to be exposed to the elements. Maximum thickness for this epoxy resin is 3mm, I was looking at bonding carbon tubes to aluminium last year and Henkel recommended this stuff http://www.henkel.co.uk/2838_UKE_HTML.htm?countryCode=uke&BU=industrial&parentredDotUID=productfinder&redDotUID=1000000J8K7 Quote Link to comment Share on other sites More sharing options...
Scott Gibbs Posted October 31, 2013 Report Share Posted October 31, 2013 Araldite should do the trick! We used it to bond E.O.D (bomb disposal suit) blast plates together where I used to work. Quote Link to comment Share on other sites More sharing options...
dave33 Posted November 1, 2013 Report Share Posted November 1, 2013 Your problem is the surface is to smooth for the glue to stick. Quote Link to comment Share on other sites More sharing options...
Thehiphopsolidier Posted November 1, 2013 Report Share Posted November 1, 2013 I have worked a lot with carbon fiber and I would never use your extender.It's way too short and the epoxy fails beacuse the fork flexes. The extender creates a breaking point.Dangerous solution it is. Quote Link to comment Share on other sites More sharing options...
chris H Posted November 1, 2013 Author Report Share Posted November 1, 2013 Yeh, it's dreadful, very poorly designed. The actual extension it's self is crap. I would like to to try and make full steel insert that runs right to the bottom of the steerer tube. Anybody want to point me in the right direction? Any tips? Quote Link to comment Share on other sites More sharing options...
*gentlydoesit Posted November 1, 2013 Report Share Posted November 1, 2013 (edited) After seeing the pics.. ash, dave and hiphop have all got a very good point. Is there any ally around where the bottom bearing sits? Maybe get a longer extention made to go all the way down, with a spotlessly clean knurled or fluted bit to use henkel on? *too slow Edited November 1, 2013 by f**megently Quote Link to comment Share on other sites More sharing options...
ben_travis Posted November 1, 2013 Report Share Posted November 1, 2013 (edited) http://www.chainreactioncycles.com/gusset-universal-headlock/rp-prod17766 edit: i don't know if the steerer bore goes through carbon forks like standard alu or steel forks so might not be of use... Edited November 1, 2013 by ben_travis Quote Link to comment Share on other sites More sharing options...
*gentlydoesit Posted November 1, 2013 Report Share Posted November 1, 2013 (edited) Yeh, it's dreadful, very poorly designed. The actual extension it's self is crap. I would like to to try and make full steel insert that runs right to the bottom of the steerer tube. Anybody want to point me in the right direction? Any tips?if you've got a vernier, whack up some dimentions, ill get you a price. Unless some kind soul on here can do it for free Edited November 1, 2013 by f**megently Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted November 1, 2013 Report Share Posted November 1, 2013 Dangerous solution it is. Yoda? 1 Quote Link to comment Share on other sites More sharing options...
Scott Gibbs Posted November 1, 2013 Report Share Posted November 1, 2013 Yoda? Sorry that really made me chuckle! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.