Bicycle Mechanics - Epoxied joints in place of silver solder?
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I have built up a set of golf clubs and have lots of resin and hardener left. If the stuff will keep golf clubs together could I use it to make a lugged frame?
05-22-03, 10:26 AM
I beleive the surface contact area on your golf clubs is greater than that available for a lugged bike unless you go with custom lugs.
05-22-03, 10:54 AM
Alan in the '60s and '70, Specialized and Trek in the '80s and '90s have glued up frames, usually with metal tubes (Al-Alan) and recently carbonfiber tubes and Al lugs. Longevity is a problem. The current enthusiasm for CF rear triangles mated to Ti main triangles in high end road frames is a current example. CF bikes are of course 'glued' together but in a mold. Your road fork is almost certainly CF glued to either steel, CF or Al steerer and fork tips for any bike above ~$1k. Doing this well at home is not straight forward. The epoxies used are not sold at Home Depot. Steve
05-22-03, 07:50 PM
sch is on the right track. CF isn't so much "glued" together as it is "molded" in an autoclave or vacuum oven. The "glues" are not simple two-part expoxies from the hardware store, but PEEK and other types of adhesives developed for the aerospace industry. There is almost nothing in the way of materials that are developed for the bicycling industry. It is too small (too few dollars) to allow for such basic R&D investments. We get "trickle-down" technology. Which is generally very good. Everything high-tech we get is just that. Developed for other uses that can carry the costs of the R&D/engineering and then adapted for use by our sport once there is a critical mass to bring the price down to what we are willing to pay for our bicycles and components. So I wouldn't want to glue together a bicycle for my own use. Definitely leave it to the pro's who have the correct equipment and dollars to do it right.
I think one big issue would be getting enoug bearing surface on the lugs. the epoxy I was considering, the golf club epoxy, is very strong in shear. I have another epoxy, which I was using to try to build a wood and fabric airplane (before I realized that I was too heavy for the design). Maybe I can start anothr thread on possibilities of wooden bicycle frames. If we were to discover wood as a material today it certainly would be considered the new miracle material.
05-23-03, 10:34 AM
Wood was used to build the earliest bike frames. I guess it would have to be rediscovered. ;)
05-23-03, 10:40 AM
You can still get rosewood rims. Ive seen one on a new Pederson from Denmark, and they look fabulous. Maybe these fancy composite rims could be made with a wood grain finish, like those laminate floor tiles.
05-23-03, 12:57 PM
I see no problems with my 30 year old Vitus lugged al. frameset, which is 'glued' together. I say give it a try. Be an interesting project and if nothing else it will make for a cool piece of wall art ;)
05-23-03, 01:56 PM
I have a set of 9-speed Dura/Ace wheels built up with wood laminate rims right here. They are hard on brake pads.
05-24-03, 08:15 AM
Considering all that is involved in building your own bike frame, I'd think that the brazeing itself would be one of the easiest parts. I sure wouldn't want to go through all of that work using an unproven technology.
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