The combination of conventional milling and ultrasonic processing, more precisely ultrasonic vibrations, belongs to the newer types of hybrid processing. The realization of vibration sources as well as parameters that are variable in the realization of this process capture the attention of readers. In this paper, in addition to the application and possibility of installing different types of ultrasonically supported milling, the emphasis is given in the field of the surface quality. Namely, the

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... application of ultrasonic vibrations in the processing of steel for improvement, which are characterized by higher hardness and toughness, and as such are a challenge for finding the most favorable processing. The quality of the processed surface as a function of the mean arithmetic roughness and the mean height of the unevenness measured in 10 points obtained in the classical conventional milling and the new hybrid process are presented.