An adjustable stroke mechanism has a housing with a central axis and a wall defining a cavity. At least one counterweight is movably disposed, at least partially, within the cavity. A mounting assembly is disposed, at least partially, within the cavity. The mounting assembly has a workpiece attachment mechanism. A stroke adjustor couples the at least one counterweight with the mounting assembly. The stroke adjustor enables the counterweight and mounting assembly to move with respect to one another such that a distance between the counterweight and the mounting assembly may be variably adjusted which, in turn, variably adjusts a stroke radius of the workpiece attachment mechanism with respect to the central axis of the housing.

The work machine includes: a gear housing; a spindle protruding in a first direction from the gear housing; a bearing held by the gear housing and including an inner race and an outer race, the bearing rotatably supporting the spindle; a tip tool attachment portion to which a tip tool is attachable, the tip tool attachment portion being provided at the spindle; a sealing member positioned further in the first direction than the bearing; and a restricting member for restricting the sealing member from moving in the first direction. At least a part of the sealing member is overlapped with the inner race in an axial direction of the spindle. The restricting member is held either by the spindle or by the gear housing.

The work machine includes: a gear housing; a spindle protruding in a first direction from the gear housing; a bearing held by the gear housing and including an inner race and an outer race, the bearing rotatably supporting the spindle; a tip tool attachment portion to which a tip tool is attachable, the tip tool attachment portion being provided at the spindle; a sealing member positioned further in the first direction than the bearing; and a restricting member for restricting the sealing member from moving in the first direction. At least a part of the sealing member is overlapped with the inner race in an axial direction of the spindle. The restricting member is held either by the spindle or by the gear housing.

A machine (10) for machining workpieces with optical quality has at least one workpiece spindle (12), which rotatably drives a workpiece (L) to be machines about a workpiece axis of rotation (C). A swivel head (14) located opposite the workpiece spindle, is pivotable about a pivot axis (B), and bears at least two tool spindles (16, 18), each of which rotatably driving at least one machining tool (T1, T2, T3) about a tool axis of rotation (D, D′). The workpiece spindle and the swivel head (14) are adjustable relative to one another along three mutually perpendicular linear axes (X, Y, Z). One axis (Y) extends parallel to the pivot axis (B). Another axis (Z) extends parallel to the axis (C) of workpiece rotation. At least one tool spindle is attached to the swivel head with its tool axis of rotation (D′) extending parallel to the pivot axis (B).

A machine (10) for machining workpieces with optical quality has at least one workpiece spindle (12), which rotatably drives a workpiece (L) to be machines about a workpiece axis of rotation (C). A swivel head (14) located opposite the workpiece spindle, is pivotable about a pivot axis (B), and bears at least two tool spindles (16, 18), each of which rotatably driving at least one machining tool (T1, T2, T3) about a tool axis of rotation (D, D′). The workpiece spindle and the swivel head (14) are adjustable relative to one another along three mutually perpendicular linear axes (X, Y, Z). One axis (Y) extends parallel to the pivot axis (B). Another axis (Z) extends parallel to the axis (C) of workpiece rotation. At least one tool spindle is attached to the swivel head with its tool axis of rotation (D′) extending parallel to the pivot axis (B).

An adjustable stroke mechanism has a housing with a central axis and a wall enclosing a cavity. At least one counterweight is movably disposed within the cavity. A mounting assembly is disposed within the cavity. The mounting assembly has a workpiece attachment mechanism. A stroke adjustor couples the at least one counterweight with the mounting assembly. The stroke adjustor enables the counterweight and mounting assembly to move with respect to one another such that a distance between the counterweight and the mounting assembly is variably adjusted which, in turn, variably adjusts a stroke radius of the workpiece attachment mechanism with respect to the central axis of the housing.

An adjustable stroke mechanism has a housing with a central axis and a wall enclosing a cavity. At least one counterweight is movably disposed within the cavity. A mounting assembly is disposed within the cavity. The mounting assembly has a workpiece attachment mechanism. A stroke adjustor couples the at least one counterweight with the mounting assembly. The stroke adjustor enables the counterweight and mounting assembly to move with respect to one another such that a distance between the counterweight and the mounting assembly is variably adjusted which, in turn, variably adjusts a stroke radius of the workpiece attachment mechanism with respect to the central axis of the housing.

A maintenance device for remotely maintaining the inside of a structure, for example, by deploying a maintenance tool to remotely clean, sandblast using various blast media, and/or paint an interior surface of a building structure.

A maintenance device for remotely maintaining the inside of a structure, for example, by deploying a maintenance tool to remotely clean, sandblast using various blast media, and/or paint an interior surface of a building structure.

According to various embodiments, there is provided a grinding module including a base; a cylinder mounted to the base with a longitudinal axis of the cylinder arranged at least substantially perpendicular to a surface of the base, wherein the cylinder is rotatable about the longitudinal axis of the cylinder, and wherein a cylindrical surface of the cylinder is adapted to receive a grinding belt; a linear actuator mounted to the base with a centreline of linear motion of the linear actuator arranged to intersect the longitudinal axis of the cylinder; and a holder connected to the linear actuator, the holder adapted to hold a workpiece with a surface of the workpiece facing the cylindrical surface of the cylinder, wherein the linear actuator is adapted to move the holder relative to the cylinder along the centreline of linear motion of the linear actuator, and wherein the cylindrical surface of the cylinder is adapted to define a curved profile so that the grinding belt is adapted to grind and shape the surface of the workpiece to conform to the curved profile.