Category Archives: Frame building

Bamboo Bike Frame Strength Test

Above is a video of my homemade frame testing apparatus. It’s far from scientific, but good enough to satisfy my curiosity as to whether or not the frame passes the AS/NZS 1927:1998 Frame & Fork Assembly test. The method described … Continue reading

Posted in bamboo, carbon fibre, Frame building, testing | 3 Comments

Finishing touches

Today I’ve put the first of the final touches to the frame – a carved bamboo head-tube Cognitive logo. It’s a bit simplified, but that’s ok as it will probably change down the track anyway. The only things left to … Continue reading

Posted in bamboo, Frame building, wrapping | Leave a comment

Carbon fibre wet layup – stage 2

Unwrapping the first layer this morning and it’s all gone well. The cling wrap’s left lots of wrinkles in the resin, which isn’t ideal, but for these base layers it’s ok as it’ll all get sanded back. Hopefully by the … Continue reading

Posted in bamboo, carbon fibre, Frame building, wrapping | 2 Comments

Carbonfiberizing

So tonight I’ve started down the road to the final wrap.  I didn’t document last night’s fibreglass layer, but it’s very similar to this process, just with white fabric instead of black. The layer of fibreglass is used between any … Continue reading

Posted in carbon fibre, Frame building | 1 Comment

Seat post in

I’ve cut, drilled and notched the seat-post sleeve and epoxied it into the seat-tube. Hopefully the carbon fibre will arrive tomorrow and I’ll start the mega-sisal-carbon-bamboo composite process!

Posted in Frame building | 1 Comment

Tune in, drop out

I’ve completed the wrapping of the drop-outs with sisal. I’ve also added stay support bars near the bottom bracket and seat-post to give the frame more stiffness. Here’s some pics: The clearance between the last cog and the chainstay wasn’t … Continue reading

Posted in Frame building, wrapping | Leave a comment

That’s a wrap

Started wrapping the sisal twine around the joints tonight. Here’s the process for the seat-tube. I’ve done it in two layers. The first using lengths that run lengthwise down each pole, following the curves of each filleted corner. The second … Continue reading

Posted in Frame building, wrapping | 1 Comment

Sanding back

Today I’m sanding back the tack epoxy to a smooth finish. I figured I probably shouldn’t have used as much epoxy for this stage as it’s not very strong, due to the micro-fibre filler that’s added to make it more … Continue reading

Posted in Frame building | Leave a comment

Tacky

So it’s taken approximately 3 months but I’ve finally tacked together my first frame! Here’s the process from start to finish: Surface preparation I roughen up the bamboo by using the edge of a Dremel sanding wheel. For the steel I sandpaper … Continue reading

Posted in Frame building | Leave a comment

Let’s set something straight.

Sharks with frickin’ lasers. That’s what I’m talking about. Ok, well minus the sharks. It’s more like jigs with frickin’ lasers. Close enough. Check out the hi-tech laser-level action below. The mitres are all done, so now it’s a matter … Continue reading

Posted in Frame building, jig building | Leave a comment

Mitre’s well show you

Here’s the results of today’s mitreing. Pretty happy with the results so far. Just have the top tube to go and then into the more finicky work of the rear triangle. The main thing I learned today is that getting both sides … Continue reading

Posted in bamboo, Frame building | Leave a comment

Choosing the bamboo for your frame

This might seem obvious, but choosing the exact bits of bamboo you’ll use for your bike frame is one of the most important things to do in the frame building process. You need to know a lot of stuff before … Continue reading

Posted in bamboo, Frame building | 1 Comment

Mitre 10

Ever wonder where Mitre 10 got its name from? Neither have I. But mitres are what I’m working on this week.  I’ve printed off my mitre templates from the ever awesome BikeCad and wrapped them around the poles I intend … Continue reading

Posted in bamboo, Frame building | 2 Comments

What to do with cracked bamboo?

If you’ve read my previous post you’ll see I’ve cracked a few bits of bamboo.  Not wanting to throw them away I’ve made use of them by splitting them into two and then cutting them down further to form two … Continue reading

Posted in Frame building | 2 Comments

Enter the jig…

Started work today on a flat wooden jig that will hold the frame in place while I tack the joints and generally put it together. I found an old cupboard door, which to my luck had 33mm holes drilled in … Continue reading

Posted in Frame building | Leave a comment