Cardan Universal 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 Cardan Universal Joint. Brief DescriptionA universal joint is used to transmit rotational motion from one shaft to another when the shafts are not aligned in a straight line. This educational model shows the most simple universal joint, Cardan joint, in which two intersecting shafts are connected by a cross-shaped component, often called a spider. With this structure, the rotation of one shaft is smoothly transmitted to the other at any crossing angle, as long as the angle is not too large. However, as can be seen in the animation, in a Cardan universal joint, the output shaft does not rotate at a constant speed even if the input shaft does. Its rotational speed varies periodically depending on the input angle, a