A tool spindle having a spindle shaft rotationally-drivable about a spindle axis, a clamping system for the automatic chucking and unchucking of a tool, wherein the clamping system comprises a movement device enabling at least one movable and/or deformable clamping body of the clamping system to be transferred from a first position into a second position by execution of a movement of a part of the movement device in relation to the spindle shaft, wherein the tool is chucked on the tool spindle in the first position and the tool can be removed from the tool spindle in the second position, wherein it comprises a balancing system, which is integrated into the tool spindle so that it rotates jointly with the rotationally-drivable spindle shaft, which is arranged coaxially in relation to the spindle axis, and which is mounted so it is axially movable.

A polishing apparatus is provided with a machining head that is supported to freely move in two horizontal directions; driving devices that enables the machining head to move; a polishing jig that is supported by the machining head to freely move in a vertical direction; a polishing member that is mounted on a lower end portion of the polishing jig; an air cylinder polishing jig moving device that moves the polishing jig and is capable of pressing the polishing member against a tube support plate; and a drive motor that is capable of rotating the polishing jig, thus, simplification of the structure is made possible.

A polishing apparatus is provided with a machining head that is supported to freely move in two horizontal directions; driving devices that enables the machining head to move; a polishing jig that is supported by the machining head to freely move in a vertical direction; a polishing member that is mounted on a lower end portion of the polishing jig; an air cylinder polishing jig moving device that moves the polishing jig and is capable of pressing the polishing member against a tube support plate; and a drive motor that is capable of rotating the polishing jig, thus, simplification of the structure is made possible.

Handheld cutoff grinder including a cutting disk (11), a motor housing having a drive unit and a cantilever (16) with a support arm (17) and an arm cover (18). A stop element (41) is provided in the arm cover (18) for the spindle (12), the stop element limiting the movement of the spindle (12) in a plane (48) perpendicular to the axis of rotation (13) during operation.

Handheld cutoff grinder including a cutting disk (11), a motor housing having a drive unit and a cantilever (16) with a support arm (17) and an arm cover (18). A stop element (41) is provided in the arm cover (18) for the spindle (12), the stop element limiting the movement of the spindle (12) in a plane (48) perpendicular to the axis of rotation (13) during operation.

A machine tool, namely a handheld machine tool or a semi-stationary machine tool, having a drivetrain, which includes a tool shaft rotatably mounted on a drive support by means of a bearing assembly and a tool holder arranged on the tool shaft for an in particular disk-like working tool, wherein the tool shaft is rotationally drivable by a drive motor of the machine tool around a rotational axis, and wherein a balancing device is arranged on the tool shaft, which includes a guide body having at least one orbital path extending around the rotational axis and at least one balancing body movably mounted in the orbital path. It is provided in the machine tool that the drive support is movably mounted on a holder of the machine tool, wherein a relative position of the drive support in relation to the holder is adjustable by the balancing device.

A spindle unit mounted to a processing unit has a collar section extending from an outside surface of the spindle unit in a horizontal direction. The processing unit includes a bottom plate having a through-hole through which a lower portion of the spindle unit penetrates, a holder including a side plate that surrounds the spindle unit with the collar section supported by the bottom plate and that is connected to the bottom plate, and an inclination adjusting mechanism that acts on the collar section to adjust the inclination of the spindle unit. The inclination adjusting mechanism includes a spring interposed between a lower surface of the collar section and an upper surface of the bottom plate and an adjusting section that acts to compress the spring and adjusts the inclination of the spindle unit by a compression amount of the spring.

A spindle unit mounted to a processing unit has a collar section extending from an outside surface of the spindle unit in a horizontal direction. The processing unit includes a bottom plate having a through-hole through which a lower portion of the spindle unit penetrates, a holder including a side plate that surrounds the spindle unit with the collar section supported by the bottom plate and that is connected to the bottom plate, and an inclination adjusting mechanism that acts on the collar section to adjust the inclination of the spindle unit. The inclination adjusting mechanism includes a spring interposed between a lower surface of the collar section and an upper surface of the bottom plate and an adjusting section that acts to compress the spring and adjusts the inclination of the spindle unit by a compression amount of the spring.

A high efficiency grinding machine for grinding the pin on a crankshaft has a machining space with a grinding wheel mounted on the lower end of an arm to form a pendulum assembly. A headstock supports the crankshaft in the machining space. A pivot drive rocks the pendulum assembly back and forth equal distances about the equilibrium position causing the grinding wheel to follow the non-circular path of a pin as the crankshaft as it is rotated about its elongated axis.

A high efficiency grinding machine for grinding the pin on a crankshaft has a machining space with a grinding wheel mounted on the lower end of an arm to form a pendulum assembly. A headstock supports the crankshaft in the machining space. A pivot drive rocks the pendulum assembly back and forth equal distances about the equilibrium position causing the grinding wheel to follow the non-circular path of a pin as the crankshaft as it is rotated about its elongated axis.