The experimental results show, that for a higher D1 the roughness increased. The intensifying roughness in axial direction of the sample D1 = 17.0 mm is referable to the growing axial bulge. Bulges appear axially and tangentially in front of the balls. The balls over run the bulge when it is too big and a metal ring occurs. This is also the reason, why this experiment was stopped earlier and the axial deformation is shorter.