South Pointing Chariot

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Human: Summary South Pointing Chariot. A Chinese chariot with a rider mounted on top always points towards the south, regardless of its direction. A series of gears driving a differential powered by two wheels creates the movement of the figure relative to the chariot. Actually not very accurate due to the need for extreme dimensional precision of the gears and wheels but great for impressing people at grand public events. It was believed to have been developed first around 2600 BC, with the first historically confirmed version created by Ma Jun around 200 AD. Its secret was lost and reinvented many times throughout history, but in 1947 George Lanchester designed a model that used a differential to drive the pointing figure. This design is based on his model. The design uses a 1:1 ratio between the wheels and the differential and a wheelbase equal to the wheel diameter. All calculations for the design can be found elsewhere. For more details, visit http://www.3dprinterclocks.com or view the video at https://www.youtube.com/watch?v=YzUKr621gr4&feature=youtu.be Print Settings Printer: Zoltrax M200 Rafts: No Supports: Yes Resolution: 0.14mm Infill: Medium Post-Printing All gears must be free-running on their shafts, so drill out to Ø4.1mm. The shafts need to fit tightly in the frames