Carbon Fiber Tubes for Bicycle fraem building?
07-14-15 | 09:01 AM
#1
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Carbon Fiber Tubes for Bicycle fraem building?
I'm new to frame building and something caught my eye. Rockwell composites sells unidirectional carbon tubing.
I know that carbon bikes can be built with molds and layering sheets of carbon fiber with appropriate orientation into the mold. But then how are unidirectional tubes used in frame building or are they reserved just for lugged carbon frames?
I know that carbon bikes can be built with molds and layering sheets of carbon fiber with appropriate orientation into the mold. But then how are unidirectional tubes used in frame building or are they reserved just for lugged carbon frames?
07-14-15 | 01:47 PM
#2
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From: NW,Oregon Coast
Bikes: 8
I just remember coming across dragon plate.., also, sells a variety of carbon tubes .. and other materials https://dragonplate.com/
You may have to make your own Carbon Lugs ..
You may have to make your own Carbon Lugs ..
Last edited by fietsbob; 07-14-15 at 01:50 PM.
07-14-15 | 01:54 PM
#3
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From: Santa Rosa, California
Bikes: Waterford 953 RS-22, several Paramounts
Joe Bringheli is a dealer/distributor for both Columbus and Dedacciai products, including CFRP tubes for bicycle frames.
Columbus carbon
Dedacciai carbon
Columbus carbon
Dedacciai carbon
07-14-15 | 01:56 PM
#4
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I'm new to frame building and something caught my eye. Rockwell composites sells unidirectional carbon tubing.
I know that carbon bikes can be built with molds and layering sheets of carbon fiber with appropriate orientation into the mold. But then how are unidirectional tubes used in frame building or are they reserved just for lugged carbon frames?
I know that carbon bikes can be built with molds and layering sheets of carbon fiber with appropriate orientation into the mold. But then how are unidirectional tubes used in frame building or are they reserved just for lugged carbon frames?
07-14-15 | 01:58 PM
#5
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Do a search for tube to tube carbon frame building. Tubes are cut, mitered, tacked with appropriate glue, and then the joints are overlaid with more carbon; either wet layup or pre-preg to acheive the strength needed for the structure. Many custom carbon builders use this method, ( Crumpton, Calfee, Appleman, ....) it allows the freedom to design without the constraints and tooling costs for molds.
07-14-15 | 05:35 PM
#6
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From: Willy, VIC
Be careful with these unidirectional tubes: the cheapest ones are pulltruded and thus have all fibres along the axis of the tube, making them useless for framebuilding as the fibre orientation provides no resistance to torsional stresses.
Last edited by Mark Kelly; 07-14-15 at 10:02 PM.
07-14-15 | 06:29 PM
#7
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Early carbon bikes (Vitus I think) were built with carbon tubes glued into metal lugs. I never rode one of these but heard they had issues and sometimes separated tubes from lugs at the worst possible time.
I think that construction concept did not have a very long run and was quickly replaced with the current technology of layup construction. This is just my observation and is not based on any research. I think the other problem with these metal lugged frames may have been electrolysis which weakened the joints. Again, just some speculation on my part.
I think that construction concept did not have a very long run and was quickly replaced with the current technology of layup construction. This is just my observation and is not based on any research. I think the other problem with these metal lugged frames may have been electrolysis which weakened the joints. Again, just some speculation on my part.
07-15-15 | 01:25 PM
#8
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From: San Jose, CA
Early carbon bikes (Vitus I think) were built with carbon tubes glued into metal lugs. I never rode one of these but heard they had issues and sometimes separated tubes from lugs at the worst possible time.
I think that construction concept did not have a very long run and was quickly replaced with the current technology of layup construction. This is just my observation and is not based on any research. I think the other problem with these metal lugged frames may have been electrolysis which weakened the joints. Again, just some speculation on my part.
I think that construction concept did not have a very long run and was quickly replaced with the current technology of layup construction. This is just my observation and is not based on any research. I think the other problem with these metal lugged frames may have been electrolysis which weakened the joints. Again, just some speculation on my part.
07-15-15 | 01:30 PM
#9
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Do a search for tube to tube carbon frame building. Tubes are cut, mitered, tacked with appropriate glue, and then the joints are overlaid with more carbon; either wet layup or pre-preg to acheive the strength needed for the structure. Many custom carbon builders use this method, ( Crumpton, Calfee, Appleman, ....) it allows the freedom to design without the constraints and tooling costs for molds.
