1. Introduction

Materials with unique properties provide irreplaceable applications in many sectors. Those properties often decrease the machinability of those materials. Moreover, parts made of those materials often require high-dimensional precision and superior quality of the surface. Processing of unique materials can be difficult, ineffective, or even impossible. Therefore, advanced machining methods were invented. One of them is the rotary ultrasonic machining. It is suitable for machining hard and brittle materials. It can process electrically and thermally conductive and nonconductive materials. One of the possible applications of rotary ultrasonic machining is for the creation of cutting-edge preparation on the cutting tools. This preparation increases tool life and process stability.