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  • Chainline Progress

    A hardware failure on my file-server this week has left me couple of days behind on CAD work this week, so where I expected to have a near-complete drivetrain assembly and instead, I only have the unfinished parts of one. However, I’m putting up images of the progress as it...

  • Best Size for a Capacitor Bank of an Electric Vehicle?

    A bit of a look into the future for the first post of this year. I don’t have any immediate plans to do anything electric vehicle, but the Atomic Duck could make a good lightweight EV platform, so I’ve been thinking about how the bits might fit in; specifically: What...

  • Winter Closedown

    After the inter-bank-holiday break, it’ll be all back to normal next week. Time to measure some bike parts so I can finish the new chainline structural design. In the mean time, why not take another look at the Front Axle Assembly A002_R002 and the more recent Laser-cut Lattice Living Hinges...

  • Lattice Hinge Test Results

    Since last week’s post about modelling Lattice Hinges, I’ve received the test pieces I ordered and also some very kindly cut by .:oomlout:. (the MDF set gave me some good insight into the hinge performance). I’ve had time to bend some, break some (and figure out why) and take some...

  • Laser-cut Lattice Living Hinges

    AKA: Snijlab-style living hinges, Sninges, Laser cut hinges, or my prefered title: Lattice Hinges Flexi-Acrylic Test by Solarbotics, on Flickr After this style of hinge popped up again, this time on Makezine, I was having a look at the linked project guide and at how they worked and I realised...

  • Wikis, Fora and Q&As

    Wiki — Sharing Information From my earliest designs for this site, I’ve wanted to include a wiki to hold technical information, drawings and documentation about Def-Proc projects as part of my commitment to allowing open access to the detail that makes up the engineering behind those projects. This also means...

  • Upgrading Opencart

    Opencart is a really nice online store, so while I’m surprised opencart doesn’t have a more streamlined upgrade process than this, I’ve probably just been spoiled by updating in WordPress! The “copy files over” and then “run the upgrade script” is not that much harder than “login to admin” then...

  • Chain Line and Adjustment

    The simplest way to connect the crank sprocket to the sprocket on the rear wheel is with a chain straight from one to the other. While this works on a bicycle because there is nothing between the two sprockets, as you can see below, a direct connection would pass through...

  • add-rel-lightbox version 0.3

    **New for version 0.3: Adjusted the filter hook priority so it uses the core [gallery] shortcode function. Also works with the_extract() e.g. on front page and category listings. All images and gallery form one linked gallery per post/page. Search for “add-rel-lightbox” from your WordPress installation or download the source from:...

  • Front Axle Assembly A002_R002

    I’ve previously written about how composite beam layups can make forming easier and how using lighter materials in the core layers reduces mass. So, with those in mind, here is what the complete, newly revised, front axle and steering assembly looks like for Atomic Duck: Front Axle Assembly — A002_R002...

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