South Pointing Chariot

thingiverse

South Pointing Chariot. A Chinese chariot featuring a figure mounted atop, forever pointing toward the south, regardless of the direction the chariot is heading. A series of gears powers a differential driven by the two wheels, creating the movement of the figure relative to the chariot. Not entirely accurate due to the requirement for extreme dimensional precision in the gears and wheels, but effective at impressing onlookers during grand public displays. Developed first around 2600 BC, with the first historically confirmed version created by Ma Jun around 200 AD. Its secret was lost and rediscovered multiple times throughout history, but in 1947 George Lanchester designed a model utilizing a differential to drive the pointing figure. This design serves as the foundation for the current model. The design incorporates a 1:1 ratio between the wheels and differential, along with a wheelbase equal to the wheel diameter. All calculations involved in the design can be accessed at an external link. For more information, visit http://www.3dprinterclocks.com and view the video located 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: The gears require free running on the shaft, necessitating drilling to Ø4.1mm. The shafts should fit snugly within the frames.