Through-coolant vibration dampened machine tool having resilient dampening system

A through-coolant resonant frequency dampened machine tool having a resonant frequency tuning capability, comprising:

• an elongate machine tool body having a rear end portion adapted for support and machining movement by a machining system and having a forward end;
• a cutting head support collar being mounted to said forward end of said machine tool body and adapted for support of a cutting head to which a replaceable metal cutting insert is mounted;
• a dampening chamber being defined within said elongate machine tool body and having an elongate internal generally cylindrical wall surface, a rear end chamber surface and a forward end chamber surface;
• a resonant frequency dampening mass being located within said dampening chamber and having an elongate external surface being disposed in spaced relation with said elongate internal generally cylindrical wall surface;
• forward and rearward axially tunable dampening devices engaging respective forward and rear end portions of said resonant frequency dampening mass and having force transmitting engagement with said rear end of said dampening chamber and said forward end of said dampening chamber;
• forward and rearward diametrically tunable dampening devices having force transmitting engagement with said resonant frequency dampening mass and with said elongate internal wall surface of said dampening chamber, said diametrically tunable devices maintaining said resonant frequency dampening mass in spaced relation with said elongate internal wall surface and resisting linear movement of said resonant frequency dampening mass within said dampening chamber;
• a moveable tuning member within said tool body having a tuning surface disposed in engagement with said axially tunable device, said moveable tuning member defining first and second oppositely angulated surfaces;
• and
• a tuning actuator member being supported for linear movement within said elongate machine tool body and being selectively moved for actuation of tuning movement of said resonant frequency dampening mass within said elongate machine tool body to substantially eliminate the resonant frequency of said machine tool during machining activity.