The ball spinning process is characterized by a complex stress state. Since this stress state is overlaid with the local stress state of the ball-plane contact to a significant damage at the workpiece. This ball-plane contact was firstly described by Heinrich Rudolf Hertz (1857–1894). The particular feature of the ball-plane contact is, that the highest surface pressure occurring at the top of the plane, injects shear stresses underneath the surface. The position of the highest shear stresses is also the location of the highest equivalent stresses and therefore the place where the first deformations occur.