Birfield Joint - Educational Model

My Educational Mechanical Examples Series This model is one of my educational mechanical mechanism examples on 80mm x 80mm base plates. You can find all models of the series in this collection => [Mechanical Mechanism Examples] The present model This is an educational model of a Birfield joint, which is a kind of constant-velocity (CV) universal joint and is most popularly used to transfer the engine's power to the wheels in cars. Note that six plastic 6mm BB bullets for toy guns are required in addition to the 3D printed parts. Brief Description Universal joints can be used to transmit rotational motion between two axes that are not straightly aligned to each other. However, the most simple implementation of a university joint, single Cardan joint is not a constant velocity joint. Even when the input is rotated with a constant rotational velocity, the velocity of the output fluctuates depending on the angular position of the axis. Compared to it, double Cardan joint (<a target="_blank