Improvement of the Dynamic Quality of Cantilever Boring Bars for Fine Boring

The paper presents ways to reduce the vibrations of special cantilever boring bars mounted on spindle heads finishing and machines. Special are designed for machining holes in non-standard conditions, example, when deep with l/d>3 (l–hole length, d-hole diameter) or a discontinuous surface. results experiments theoretical developments, as well schemes experimental stands, presented. investigated methods reducing fluctuations following: use dynamic damper intermittent cutting elements; suppression normal cutter workpiece surface due excitation directed tangentially not causing processing errors; increased damping zone changing design bar. tuning parameters damper, logarithmic decrement vibrations, conditions effective during interaction their two coupled forms given. shown tables graphs.