A sub-assembly, rock drilling rig and method of absorbing vibrations in rotary and DTH drilling. The sub-assembly (8) is for transmitting torque and axial forces between a rotating head (5) and a drilling tool (7). There is an axial floating arrangement (15) for providing an allowed limited axial relative movement...

An earth boring rotary bit and method of manufacturing the same. The rotary bit (9) is intended for rotary drilling and comprises a bit body (11) having three uniform legs (12) and three uniform rolling cone cutters (13) rotatably mounted to the legs. The three cone cutters have uniform angular offset (Ao) and linea...