Abstract: Spherical bearing assemblies comprise an outer ring, an adjustable receiver adjustably coupled to the outer ring and at least partially received within the outer ring, and a locking bearing adapter configured to operatively couple the adjustable receiver to a boring bar of a machine tool. The locking bearing adapter includes a tapered sleeve partially received within the adjustable receiver bore and tapered toward the outboard direction, an interior nut threadingly coupled to the tapered sleeve and configured to engage the adjustable receiver, and an exterior nut threadingly coupled to the tapered sleeve and positioned adjacent to the interior nut with the interior nut positioned between the exterior nut and the adjustable receiver. Line boring machines comprise a boring bar, a cutting tool, a spherical bearing mount assembly including a spherical bearing assembly, a rotational drive unit, and an axial feed unit.

Abstract: Machine tools and methods for machining turbine rotor assemblies are disclosed. Some machine tools include a drill arm that pushes off of a turbine stage that is adjacent to a turbine stage to be machined. Some machine tools include a clamping arm that secures the machine tool to a turbine stage to be machined and an adjacent turbine stage. Some methods include pushing-off of a turbine stage that is adjacent to a turbine stage to be machined. Some methods include securing a machine tool to a turbine stage that is adjacent to a turbine stage to be machined. Some methods include monitoring at least one of a current delivered to a first motor and a voltage applied to the first motor and controlling a second motor in response to the monitoring. Some methods include sequentially machining a turbine stage with cutting tools having increasing lengths and/or diameters.

Abstract: Machine tools and methods for machining turbine rotor assemblies are disclosed. Some machine tools include a drill arm that pushes off of a turbine stage that is adjacent to a turbine stage to be machined. Some machine tools include a clamping arm that secures the machine tool to a turbine stage to be machined and an adjacent turbine stage. Some methods include pushing-off of a turbine stage that is adjacent to a turbine stage to be machined. Some methods include securing a machine tool to a turbine stage that is adjacent to a turbine stage to be machined. Some methods include monitoring at least one of a current delivered to a first motor and a voltage applied to the first motor and controlling a second motor in response to the monitoring. Some methods include sequentially machining a turbine stage with cutting tools having increasing lengths and/or diameters.

Abstract: A lightweight, compact, machine tool for radially machining a surface is provided, where the machine tool includes a cutting head having a cutter movably coupled thereto, and the cutter is further coupled to a control member such that the control member can variably control radial movement of the cutter relative to the cutting head.