Author Archives: Mik Efford

Wrapping & Heating

I’m continuing to wrap the bottom bracket joint today. I’ve now done a total of 9 layers, which I’m pretty sure will be enough for a sturdy and stiff BB. After wrapping up each series of layers in cling wrap … Continue reading

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Wrapping the bottom bracket

The headtube’s pretty much done so I’m now starting work on laying up the bottom bracket area. It’s a much more complex shape to work with, which made the template cutting all the more fun. I’ve figured out a better … Continue reading

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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

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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

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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!

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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

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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

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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

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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

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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

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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

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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

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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

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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

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Heat treating bamboo

Over the course of the last few months I’ve heard a lot about the process for heat treating bamboo. People put it in ovens, attack it with butane torches, smoke it over fires or dry it out in kilns. Why … Continue reading

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