The optimum oscillation behavior of the ultrasonic sonotrodes is determined by means of FEM (Finite Element Method) calculation. Highest precision requirements in terms of CAD/CAM calculation algorithms guarantee precise 3D contours for sonotrode manufacturing. Measuring and documentation of the amplitude distribution is performed at the vibrating sonotrode using state-of-the-art laser measurement technology. Special surface finishings result in even longer service life spans of the ultrasonic sonotrodes.