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Framebuilders Thinking about a custom frame? Lugged vs Fillet Brazed. Different Frame materials? Newvex or Pacenti Lugs? why get a custom Road, Mountain, or Track Frame? Got a question about framebuilding? Lets discuss framebuilding at it's finest.

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Old 07-14-11, 12:24 AM   #1
RaleighSport
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Bamboo question..

I've got some very nice large diameter bamboo, was already fairly well aged, I am however heat treating it to get some final shrinkage/darker coloring, rather then going with the torch I'm using the oven method, from everything I've read/seen I would have thought they'd only need one cooking, I have a brown but it's nowhere near as dark as anyone elses I've seen, I'm suspecting it's because I didn't scorch the outside and let it all caramalize at once instead of heating the outside to get the inside, opinions please on if it needs a second round in the oven?
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Old 07-14-11, 01:22 AM   #2
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I don't know, structurally - but it sounds very tasty!

KeS
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Old 07-14-11, 01:23 AM   #3
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Photos plz. If you have baked your tubes once and still want the tubes to get darker... try using a wood stain/finish on the tubes. I'm not a builder but i want to say that burning and baking is prob not a good thing. Stick with the oven method.
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Old 07-14-11, 01:34 AM   #4
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pics tomorrow, and I already plan to sand then stain/then coat with epoxy or something similar, going for a black but natural grain bamboo look.
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Old 07-18-11, 11:41 AM   #5
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the propane hand torch darkend my bamboo much more than the oven heat treatment did.
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Old 07-18-11, 12:19 PM   #6
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the propane hand torch darkend my bamboo much more than the oven heat treatment did.
I'm sure it did, I think I'm happy with the baking results though. I'm curious how you weight tested your bamboo after baking or if you did?, I'm using sawhorses and bodyweight/force myself...
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Old 07-18-11, 01:02 PM   #7
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I heat treated most of my smaller tubes in the oven. I had mostly pre-cut these to be Chainstays and Seatstays. The bigger tubes for the main triangle I cured with the hand torch. After the heat curing I put all the bamboo in my bamboo drying house for 4 months or so (my sons tree house). So as for a strength test comparison of torch to oven, it would be an apples to oranges test. They all seem WAY stronger than the green fresh cut stuff. I just built my table jig this weekend and glued my seat post steel insert into the top of my seat tube.
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Old 07-18-11, 01:07 PM   #8
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Ahh okay, very cool but I think I got lucky I found a bamboo wholesale supplier here, who was kind enough to let me into his dried bamboo shed, I'm basically heating for final shrinkage and that's about it! 4 months huh? I see everywhere people only say 3, but I'm thinking your probably on the right track. Oh and I'm doing approximate cuts ahead of time 1-2 inches larger then what I'll final need, I know it's a bit overkill but the dremmel can handle it.
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Old 07-20-11, 03:55 PM   #9
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much better to have them too long then you can decide which end to trim to have the best tube.
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Old 07-21-11, 01:14 AM   #10
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cbchess
you should really post pics of your progress! You would be the first one here to do so with a bamboo bicycle!
I'm sure im not the only one that is interested!!!
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Old 07-21-11, 11:33 AM   #11
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cbchess
you should really post pics of your progress! You would be the first one here to do so with a bamboo bicycle!
I'm sure im not the only one that is interested!!!
You would be incorrect sir http://www.bikeforums.net/showthread...+bicycle+build enjoy.
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Old 07-21-11, 12:20 PM   #12
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I need to take some pictures so I can post them.
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Old 07-21-11, 12:28 PM   #13
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yes you do, and I guess I do too.
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Old 07-21-11, 06:04 PM   #14
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SweetNess!!! Thanks
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Old 07-21-11, 06:21 PM   #15
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Raleighsport,

IMO--Useing a torch is only good on green bamboo. If it's too dry to start or if you singe a spot you will hear a light crackle sound and the tube will have a weak spot. By combing the bamboo with the torch longitudenally, you break the cell walls with pressurized steam which allows the whole piece to dry faster than if you just put it away. The oven does not do this, but it will carmelize the sugars making a more flexabile, harder to split culm. If it's pretty dry to begin with I would be afraid of splitting it by heating it, especially if it's never been heated. The darker color of torched bamboo is partially the carbon on the surface and the depth/darkness is related to how long heat is applied. Mine start green and I torch to a dark chocolate chocolate/coffee brown, when I'm ready to bond (after mitering) I sand the whole thing down with a DA at 220 grit until the "outer brown layer" is gone. I wipe with a tack rag, then I bond; that way there is less hand sanding later and the surface is more absorbent of epoxy. If left in the dark brown state the epoxy will peel right off (which is due to the natural surface wax the plant produces). Here's a few finished shots. 1. my second cruiser 2. composite Direct Mount spacing 3. Mtb frame 4. Road frame seatstay yoke/bridge.



Andy
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File Type: jpg M1 Tight Spaces.jpg (96.7 KB, 92 views)
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File Type: jpg R1 Seatstay Yoke and Bridge small.jpg (102.2 KB, 79 views)
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Old 07-21-11, 08:41 PM   #16
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Andy that bike is gorgeous man gorgeous and so are the other shots! And thank you, you pretty much confirmed everything I was pretty sure of from experimenting. I have some gorgeous baked bamboo now, but I don't plan to use that on my bike (the baking increased the rigidity but, because of the dryness also made it more brittle BIG FLAW) I'm going to go back to the same place though, and select some more predried bamboo and this time just cut/sand/miter. Well not that simple, but stainingoutside then sealing then epoxy and inner foam is kinda my plan.
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Old 07-25-11, 07:31 AM   #17
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Make sure you rough up the ends with a coarse file or hand saw to give the bamboo some extra tooth for bonding. I forgot to mention you need to pierce the culm inside the tubes before hand torch curing, or baking or the gas will expand and pop your bamboo.

Last edited by cbchess; 09-21-11 at 12:12 PM.
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Old 07-25-11, 07:56 AM   #18
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a few pictures

I tacked together my rear triangle this weekend. you can see you full sized layout and the jig I built right on top of it.


rear frame in jig w flash by cbchess, on Flickr

Here is a close up of the seat tube and seat stay joint

seatstay seat tube joint by cbchess, on Flickr


here you can see the steel seat tube insert. I cut the slot myself.

seat tube by cbchess, on Flickr

Last edited by cbchess; 07-25-11 at 08:37 AM. Reason: more pictures!
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Old 07-25-11, 08:06 AM   #19
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a few more pictures

here are a few more:
close up of the dropouts - just tacked in place. These will get full carbon wraps out to the blue tape.

rear dropout close up by cbchess, on Flickr

Chainstays tacked in place - I mixed sawdust into my epoxy to create a super sturdy filler and joint. This need a bit of shaping before the carbon fiber wrap.


chainstays close up by cbchess, on Flickr

BB joint close up. My donor frames were a Surly cross check and a bianchi. Both steel.

bb close up by cbchess, on Flickr



Here is a frame builders question.
My chainstays are centered but my seat stays are not, due to a deeper miter cut on the overlap joint on the drive side. will this mess any thing up? it is about 1/4 to 1/2" closer on the driveside.

Last edited by cbchess; 07-25-11 at 08:31 AM. Reason: spelling
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Old 07-25-11, 08:09 AM   #20
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last pictures

full jig view:

full jig view 2 by cbchess, on Flickr

head tube waiting for top tube and down tube.

full jig view by cbchess, on Flickr

Last edited by cbchess; 07-25-11 at 08:30 AM.
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Old 07-25-11, 08:21 AM   #21
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good
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Old 07-25-11, 08:56 AM   #22
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My wife named my new bike the Ginsu Glider.
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Old 07-25-11, 11:48 AM   #23
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Love it! and I really don't know about your question...
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Old 07-30-11, 08:05 PM   #24
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http://www.powerfibers.com/PowerFibers_Issue_44.pdf
^^^
One of my other loves are bamboo fly rods. Found a good article in a bamboo fly rod makers trade rag on building a bamboo bike frame.
I go with a different approach with the bottom bracket but it's a good example of a construction process.
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Old 08-01-11, 12:04 PM   #25
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great link! the 18 piece bamboo fly rod was impressive.
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