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  • Manufacturing Ready

    Isn’t it always the smallest things that take the longest time? Having spent a couple of 12 hour days going over the CAD model, checking every part for interference, correctly sized holes, bend radii and correct fit to the adjoining parts; the assembly model looks pretty much the same as...

  • Steering for the finish

    I seem to have spent quite a long time looking at bearings this week, to generate an attachment method for the steering wheel and column that is simple to manufacture. The complexity of the choice comes from the combined loading where the steering column is held (axial, radial and moment...

  • Making Adjustments

    To be ready for initial prototype production, I’ve been finalising the last few parts of the chassis design; last week’s seat, this weeks adjustable bottom bracket assembly, and the detail of the steering assembly next week. It is all coming together well, but where problems do arise, it’s invariably where...

  • Are you sitting comfortably?

    …then I’ll start pedalling! So, a simple seat that will be comfortable for most people to use (I can see why there are designers who only do chairs!) with a maximum of one adjustment. To keep it simple sliding is out, as are any complex office chair style adjustments, so...

  • Add rel="lightbox" to Wordpress Images

    _Now a WordPress Plugin, see the most recent version releses: Category > add-rel-lightbox I really like the pop-up display style of lightbox and slimbox, and WordPress has a really nice integration for adding pictures, but the two don’t talk to each other automatically. Getting images insterted from the WordPress media...

  • Staying on track

    Here’s a quick look at the front axle connection to the chassis and the steering geometry. Front Axle CAD Detail The axle tube is a single piece of stock aluminium tube, 2 inch outer diameter (50.8mm), with 1.63mm thick walls in 6061-T6. All that is needed to change the tube...

  • Structural Epoxies - sticking it together

    Almost all metal cycle frames have welded joints, because welding is a strong and simple jointing technique for metal. (I have seen an aluminium framed trike constructing with no welding, but it’s definitely the exception) However welding is a skill, and not every home builder will have the experience necessary...

  • On Home-Build Velomobiles

    A discussion on ‘BROL about what is needed to expand the velomobile market raised some interesting avenues to explore, including the suggestion of a low-cost, home-built kit that doesn’t need any moulds made, hundreds of hours of finishing and smothing or fibreglass layup, bagging and curing. A couple of years...

  • New Year, Perihelion, Maker Faire UK

    Happy New year for 2011, which I hope (ironically) will be the year of the Human Powered Vehicle. I’m going to ignore all of the previous 200+ years of use and technical development, the millions of bicycle riders around the world, the incredible HPV world records and the 100-or-so years...

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