Chatter frequencies of micromilling processes: Influencing factors and online detection via piezoactuators

► Process damping increases both stability boundaries and chatter frequencies. ► Tool clamping conditions significantly affect chatter frequencies. ► Nonlinear relation between clamping torque and stiffness at tool holder-tool joint. ► Strong effect of shank length on the first natural frequency and chatter frequency. ► Online chatter detection by in-process excitation via piezoactuators.