Japanese builder akiyuki applies the concept of strain wave gearing to Great Ball Contraptions, a popular LEGO fan convention theme in which hundreds of balls are passed through complex machinery. From both an engineering and a visual standpoint, the module is mesmerizing to watch. See the module in action in the following 2 minute video.
A fascinating read detailing the design process and engineering challenges faced by the builder can be found on akiyuki’s blog.
Great Ball Contraptions are a mainstay of LEGO conventions, consisting of short sections of machinery which transport LEGO soccer balls from one side to another. Each builder’s machine can be connected to the next, to transport a dizzying number of balls around a display. Many builders focus on the all-important task of getting the fundamental mechanics working smoothly, but we’re seeing more and more builders take some time for the aesthetics as well. One such example is this enthralling contraption bychumuhou (楚沐猴), which has a fantastic steam-age industrial vibe. Check out the video to see it in action, too!