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obscurant

Member since Oct 2015 • Last active Nov 2020
  • 1 conversations
  • 15 comments

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  • in Current Projects
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    Many thanks, @Jonny69, and the others for bringing this to your notice. The original fork was a hybrid design of the kind you describe, except in aluminium, and I did wonder about replicating it in titanium. But then I would feel compelled to 3d print the titanium part, which is another level of complexity hell...

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  • in Current Projects
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    The old bike never surfaced: I suspect it was broken down for parts and the frame discarded. Mike did not have the original technical drawing, but it was simple enough to recreate from a sketch of his, and my photos of the old bike.

    I think it needs a carbon monoblade at the front, but cannot find anyone to make one, and I have no bandwidth to learn how to do that myself.

  • in Current Projects
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    Some photos at Bikefix here: https://www.instagram.com/p/B_SOcpdl8bX/­ who kindly laced up the wheels. The rear wheel is not so much misaligned as aligned to an entirely different axis. Burrows realised it does not matter because the turning circle of a bike is so large in comparison with the offset.

    Welding was done by an outfit in China, and I did the rest. It needs more design work, especially the front fork, but once it is finished it may possibly be of interest to others.

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    It is indeed my bike, but not the one I lost. I remade it in titanium, with a new design for the fork that leaves a great deal of room for improvement. Rigidity is fine: these are large diameter tubes.

  • in Current Projects
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    Many thanks.

    Perspective makes the rear weirder than it is. The shell of the hub and the axle are a single piece of machined metal mated through a hex profile to a driving wheel with a standard freewheel on it. The axle spins on two bearings enclosed in an asymmetric cylinder clamped within the frame. That is all there is to it.

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    It was taken from inside a private courtyard, just outside my window, in a mews behind High Street Kensington. I never leave it outside, but was distracted and it ended up there overnight. It now looks like the attached, except that the handlebars are clad in red leather.

    I was going to dimension the frame yesterday morning, so I can reproduce it just in this eventuality, but did not get round to it. Perhaps I can persuade Mike Burrows to share his frame drawing even if I doubt he will be interested in making another himself.

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    Happy to reward anyone who does. It took a great deal of thought and effort to make.

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    Now stolen: news of any sightings gratefully received.

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    Here it is:

    https://instagram.com/p/9Q_LgVjZrC

    The wheel is laced onto a shell that connects to a solid axle via a hex profile, as does a driving wheel on the other side. The bearings are inside the insert within the frame. There are nylacast spacers inbetween.

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