Mating illustration using two datum points

The following illustration explains a situation where you will use two Datum Point with Coincidence Constraint for mating the components. Generally you will need this mating capability, when mating spherical-cylindrical geometries.

Take the example of mating a link and a ball as shown below. The spherical ball has to sit exactly at the center of the cylindrical end of the link. Note that the geometry does not make for a simple planar mating condition. You will need the centers of the sphere and the cylinder for references. These centers can be generated using a combination of Datum Line and Datum Point. Mating is achieved selecting the two datum points as entities to be mated, using the Coincidence Constraint type. Note This type of coincident constraint can be used with vertices also depending on the geometry of the mating components.