A new type of impact damper with long overhangs in the internal turning of hardened materials.

The performance of this impact damper with three different sizes of spheres was compared to the performance of a solid steel bar, in terms of workpiece surface roughness, tool vibration and tool life. The main conclusion of this work is that the use of the kind of impact damper tested in this work makes possible the increase of the tool overhang (tool length outside the machine turret) without damaging surface roughness and tool life and, consequently, it also makes the turning of longer holes possible than when a solid bar is used8225526017th CIRP Conference on Modelling of Machining Operations, CIRP CMMO2019-0