British developer Robert Murray-Smith has dedicated a new project to one of the oldest mechanical concepts in the history of technology: the differential gear. The STL file, which is available free of charge on the Thingiverse platform, is based on a historical design inspired by sketches by Leonardo da Vinci. The aim was to produce a simple, functional differential entirely using 3D printing.
A differential fulfills two basic functions. It can distribute power from one drive to two outputs or combine power from two sources to one output. In vehicles, it allows the wheels to turn at different speeds when cornering. Murray-Smith takes up this idea and designs a gearbox that consists of simple components that can be realized using 3D printing. Instead of modern bevel gears, he uses so-called lantern and pinion gears – a form that was already used in historical water mills.
The model consists of several axles, cogwheels and spacers, which are arranged at the correct distance from each other. The assembly is done step by step by gluing. All components were designed in Tinkercad and can be assembled without special machines or reworking. Although the project is primarily intended as a demonstrator, it provides a sound basis for further developments, for example in the field of mechanical drive solutions for light applications or educational purposes.
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