Construction of the Cubic of Stationary Curvature for a Four-bar Linkage | Mechanical Design 101

This video shows the construction of the cubic of stationary curvature. The intersection of the cubic of stationary curvature with the inflection circle, iw Ball's point which is a coupler point that traces a locally straight line trajectory. This video also shows how to vary the coupler point and the dimensions of the reference polygon for the four-bar linkage to vary the shape of the coupler curve.