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Drew Diller
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fgayford, making progress on the bladder end of things...
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prsw
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ok, thanks. This method seems interesting but I think I will start with tubular bag folded back on itself, or latex bicycle inner tub.
http://motoform.blogspot.se
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Drew Diller
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prsw (14/03/2013)
Cool bikes.
What type of material have you used for your bladders?I didn't intend to, and I still have to work out a show stopper problem when going higher than 30 psi, but to answer your question: Smooth-On's reusable vac bag silicone. I originally bought a test batch to do just that, vacuum bagging. It can stretch more than 200% in practice and remain in one piece. I used word "playing" seriously, as I don't have it working to what I'd call effectively yet. At any rate, I can see the potential. I originally got interested in the stuff after experiencing some bridging in my most recent frame, of which I do not have any decent pictures out of embarrassment. I overheated a bamboo pole through too might infrared light. I also put the bottom bracket shell in backwards... ugh. I hunt it up in my garage as a monument to what happens when I get impatient.
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prsw
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Cool bikes. What type of material have you used for your bladders? Drew Diller (14/03/2013)
[quote] fgayford (14/03/2013)
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Drew Diller
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Right on, I'll do that! Uh - is it just me or is the quoted reply process kinda weird on this forum? I have noticed by several individuals where their reply is in a quote, and I did so myself at least once so far.
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fgayford
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Drew Diller (14/03/2013)
fgayford (14/03/2013)
I will throw an idea out there for what it is worth. What if you were to make your attachment points in carbon fiber in a closed mold so the outside would be perfect. Slide your bambo into the sockets with adhesive for joining. You would have to pre machine the bambo some what to fit. So bambo dia would have to be carefully selected to fit with the least amount of trimming.
Fred I agree 100%. I bought a wood turning lathe for that purpose, 40" cutting length. I'm trying to work out the specifics of the inflation / machining parts of the problem. My problem is making the molds very precise. I have a 3D printer, but I don't trust its precision yet, so I'm thinking about sealing up some MDF molds cut by a ShopBot milling machine. The other issue with inflation bladder inside a closed mold is the idea of getting the steer tube bearing insert surfaces to be completely coaxial. So, while the outside should look perfect to be commercially palatable, I also need to figure out how to make a *portion* of the inside completely smooth, round, and coaxial as well. I've been playing with making my own bladders, and I definitely see the appeal. There are a whole bunch of carbon bike factory tours on youtube. You don't have to re invent the wheel. I posted a very good one in the Youtube topic page started by Scott. (its in this forum)
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Drew Diller
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fgayford (14/03/2013)
I will throw an idea out there for what it is worth. What if you were to make your attachment points in carbon fiber in a closed mold so the outside would be perfect. Slide your bambo into the sockets with adhesive for joining. You would have to pre machine the bambo some what to fit. So bambo dia would have to be carefully selected to fit with the least amount of trimming.
Fred I agree 100%. I bought a wood turning lathe for that purpose, 40" cutting length. I'm trying to work out the specifics of the inflation / machining parts of the problem. My problem is making the molds very precise. I have a 3D printer, but I don't trust its precision yet, so I'm thinking about sealing up some MDF molds cut by a ShopBot milling machine. The other issue with inflation bladder inside a closed mold is the idea of getting the steer tube bearing insert surfaces to be completely coaxial. So, while the outside should look perfect to be commercially palatable, I also need to figure out how to make a *portion* of the inside completely smooth, round, and coaxial as well. I've been playing with making my own bladders, and I definitely see the appeal.
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fgayford
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Hi Drew
Fred Flintstone would really like your first bike. Your second one looks pretty good.
I will throw an idea out there for what it is worth. What if you were to make your attachment points in carbon fiber in a closed mold so the outside would be perfect. Slide your bambo into the sockets with adhesive for joining. You would have to pre machine the bambo some what to fit. So bambo dia would have to be carefully selected to fit with the least amount of trimming.
Fred
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Drew Diller
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Thank you. It is a pretty bizarre plant, isn't it! What species of bamboo did you use for your project? I am a fan of Dendrocalamus and Guadua varieties.
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Matthieu Libeert
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Very cool! messed around with bamboo a few months ago, making some kind of a bike too.
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