Surprising failure in wheel experiment

Something has been bothering me. I spent a lot of effort to get the hole in the drivers concentric with the tyre, but then who knows what happens when the axle passes through that hole? Indeed, I’m fairly certain the axles are neither concentric nor perpendicular to the tyre. So, as I have to make two more drivers anyway, I thought I would see if … Continue reading Surprising failure in wheel experiment

Engine truck: two steps forward, one step back

Obviously, things were going too well. Parts were literally flying off the frets and attaching themselves to the frame. I was hopeful of actually hitting my deadline. The optimism continued as I folded up the the engine truck. Even tacking the bottom chord onto the side frames worked reasonably easily, despite being a flawed design in the first place. Sure, I etched one of the … Continue reading Engine truck: two steps forward, one step back