A spindle unit for a machine tool for fine-machining workpieces having groove-shaped profiles, has a rotatably mounted spindle shaft (2). The spindle shaft is subdivided in the axial direction (AR), one behind the other, into a fastening portion (A) for fastening a tool (4) or a workpiece to be machined, a first bearing portion (B), a force transmission portion (C), and a second bearing portion (D). A drive unit (5) serves to drive the spindle shaft by way of force transmission onto the force transmission portion. A first and a second bearing point (13, 14) are designed to bear the spindle shaft in the first bearing portion, and a third bearing point (15) serves to mount the spindle shaft on the second bearing portion. The first and the second bearing points each have one or more hydrostatic bearings. The third bearing point has one or more hydrostatic and/or hydrodynamic bearings.

A machine tool includes a rotation table unit including a rotation table configured to rotate with respect to a first axis. The rotation table unit is configured to move along a second axis that is orthogonal to the first axis. The machine tool includes a spindle unit including a spindle configured to rotate with respect to a third axis that is orthogonal to the first axis and the second axis. The spindle unit is configured to move along the third axis. The machine tool includes a bed that supports the rotation table unit and the spindle unit. A front part of an upper surface of the bed includes a recess in which the rotation table unit is arranged. The spindle unit is located at a rear part of the upper surface of the bed.

A cam device includes: a cam unit, a reduction unit and a housing. The cam unit includes a rotating body and a cam. The rotating body includes a cam follower. The cam includes a cam surface that engages with the cam follower, and the cam is configured to rotate the rotating body by rotation of the cam. The reduction unit is provided between a motor and the cam, and includes a motor gear and a cam gear. The motor gear is mounted on a motor side of the reduction unit. The cam gear is mounted on a cam side of the reduction unit. The housing includes a first housing part and a second housing part as a unit. The first housing part accommodates the cam unit, and the second housing part accommodates the reduction unit.

A cam device includes: a cam unit, a reduction unit and a housing. The cam unit includes a rotating body and a cam. The rotating body includes a cam follower. The cam includes a cam surface that engages with the cam follower, and the cam is configured to rotate the rotating body by rotation of the cam. The reduction unit is provided between a motor and the cam, and includes a motor gear and a cam gear. The motor gear is mounted on a motor side of the reduction unit. The cam gear is mounted on a cam side of the reduction unit. The housing includes a first housing part and a second housing part as a unit. The first housing part accommodates the cam unit, and the second housing part accommodates the reduction unit.

A support device (1) for supporting motor vehicles, with two plate-like bodies, wherein one of these plate-like bodies is a base plate (2) and the other of these plate-like bodies is a support plate (4) capable of being laid on this base plate (2), wherein the base plate (2) has a first even surface (2a) which is opposite a second even surface (4a) of the support plate (4) and wherein the support plate (4) has a support face (4b) for supporting the motor vehicle. According to the invention the support device (1) has a separation device (6, 62, 32, 34) which at least for a time generates a force which acts between the base plate (2) and the support plate (4) and which holds the support plate (4) in a hovering state above the base plate (2), in which hovering state, in particular, the first even surface (2a) and the second even surface (4a) do not touch each other.

A support device (1) for supporting motor vehicles, with two plate-like bodies, wherein one of these plate-like bodies is a base plate (2) and the other of these plate-like bodies is a support plate (4) capable of being laid on this base plate (2), wherein the base plate (2) has a first even surface (2a) which is opposite a second even surface (4a) of the support plate (4) and wherein the support plate (4) has a support face (4b) for supporting the motor vehicle. According to the invention the support device (1) has a separation device (6, 62, 32, 34) which at least for a time generates a force which acts between the base plate (2) and the support plate (4) and which holds the support plate (4) in a hovering state above the base plate (2), in which hovering state, in particular, the first even surface (2a) and the second even surface (4a) do not touch each other.

An air bearing slide (20) arranged on a rotational table (11) includes a movable table (40) that has a workpiece placement surface (42a) and that floats due to pressure of compression air to be movable horizontally in any direction. A workpiece auto-centering apparatus includes: a plurality of stopper apparatuses (30) that include an abutment portion (31a) against which a workpiece W can abut to center the workpiece W, and a pressing apparatus that presses the workpiece (W) such that the workpiece (W) abuts against the abutment portion (31a) of the stopper apparatuses (30). Thus, the workpiece auto-centering apparatus and auto-centering method have a simple configuration and can perform a workpiece centering operation in short cycle time.

An air bearing slide (20) arranged on a rotational table (11) includes a movable table (40) that has a workpiece placement surface (42a) and that floats due to pressure of compression air to be movable horizontally in any direction. A workpiece auto-centering apparatus includes: a plurality of stopper apparatuses (30) that include an abutment portion (31a) against which a workpiece W can abut to center the workpiece W, and a pressing apparatus that presses the workpiece (W) such that the workpiece (W) abuts against the abutment portion (31a) of the stopper apparatuses (30). Thus, the workpiece auto-centering apparatus and auto-centering method have a simple configuration and can perform a workpiece centering operation in short cycle time.

A feeding module includes a slider and a guider. The slider includes two sliding portions, a first connecting portion and four sliding blocks with hydrostatic bearing. Each sliding portion has a first through hole. The first connecting portion is connected to the sliding portions. Two of the sliding blocks are disposed in the first through hole in one of the sliding portions, another two of the sliding blocks are disposed in the first through hole in another one of the sliding portions. Each sliding blocks has a second through hole. The guider includes two cylindrical portions corresponding to the two sliding portions. One of the cylindrical portions penetrates through the second through holes in two of the sliding blocks. Another one of the cylindrical portions penetrates through the second through holes in another two of the sliding blocks.

A workpiece positioning arrangement comprises a positioning device for positioning a workpiece as well as a decoupling device for the decoupled storage of the positioning device, wherein the decoupling device comprises a carrier element, on which the positioning device is arranged, and a base element, on which the carrier element is supported. For decoupling the dynamic reaction forces of the positioning device on the base element, the carrier element is supported on the base element so as to move freely at least in a certain range, preferably essentially free of counterforces, in a sliding manner.