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Carbon Fiber weave question.(6 posts)

Carbon Fiber weave question.jaybird
Jan 24, 2004 7:35 PM
Does anyone have any info from an engineering / design standpoint on the difference between the two types of carbon fiber weaves out there. There is the long wound weave that appears to be made of continuous fibers and then there is the short weave which looks basically like a patchwork of smaller peices of fiber just randomly glued together.

My question is centered around the Record cranks and that wouldn't the short weave be less stiff and be harder to control a constant stifness throughout the product? I could see that it would be cheaper to produce but it just doesn't make sense...

I guess I'm just wondering what are the pros/cons from a technical point of view of the long v. short weaves...
re: Carbon Fiber weave question.divve
Jan 25, 2004 12:35 AM
If you're talking about the current Record carbon cranks, they're simply injection molded with multi-directional carbon fiber. I think it's actually a some sort of carbon fiber reinforced thermoplastic. One of the advantages is they don't have to worry about the layup direction anymore and can concentrate on the optimal shape for their crank design.
re: Carbon Fiber weave question.motta
Jan 25, 2004 8:18 AM
The "weave" you see on carbon frames and parts is nothing more than a cosmetic layer. If you want to see what it really looks like underneath that cosmetic layer look at a carbon fiber steer tube or the end of a carbon fiber seatpost.
You're thinking too hardKerry Irons
Jan 25, 2004 4:34 PM
So you want to second guess the crank manufacturers, specifically Campy? As with most materials, it's more about execution than fundamental properties. Does it seem likely to you that Campy would have chosen a poor method or material to build their cranks? Does it seem likely that others have far superior methods/materials? In practice, there is precious little advantage of CF cranks over cold forged aluminum, but if they make you nervous, don't buy them.
You're thinking too hardSpoiler
Jan 25, 2004 8:45 PM
True. And in some cases like handlebars and cranks, you're paying more money for a LESS stiff component. It's much cheaper to stick on some carbon fiber-pattern contact paper for the look.
That wasnt what I was questioning...jaybird
Jan 26, 2004 10:53 AM
All I wanted was some technical info on how the cranks are made and why they are made a certain way. FWIW I have a Look KG381 with a full Record kit on it so I am not worried about its durability.