Double Cardan joint - Educational model

My Educational Mechanical Examples SeriesThis 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 modelThis is an educational model of the Double Cardan Universal Joint.Brief DescriptionA double-Cardan joint is a type of universal joint used to transmit rotational motion between two shafts that are not aligned in a straight line. It consists of two Cardan joints connected in series, each using a cross-shaped component, commonly called a spider, to couple two intersecting shafts. A Cardan joint allows rotational motion to be transmitted smoothly at a wide range of crossing angles, as long as the angle is not too large. However, in a single Cardan universal joint, the output shaft does not rotate at a constant speed even if the input shaft does. Its angular velocity oscillates periodically depending on th