A stop for a rotating drilling, milling or countersinking tool comprising a stop sleeve coupled to a radial rolling bearing in such a way that it freely rotates about the tool, an outer bearing bush of the radial rolling bearing being attached to the stop sleeve and an inner bearing bush of the radial rolling bearing being attached to a shaft sleeve that can be attached to a tool shaft of the tool. An axial rolling bearing is also provided, a housing washer of the axial rolling bearing being supported on the stop sleeve and a shaft washer of the axial rolling bearing being supported on the shaft sleeve. In a secondary aspect, the invention relates to a drilling, milling or countersinking tool provided with such a stop.

A rail system (1) has a rail (20), a support device (10) for the rail (20), and a clamping device (40) for fixedly clamping the rail (20) in the support device (10). The clamping device (40) fixedly clamps the rail (20) in the support device (10) only in an operating situation. In the operating situation, a holding device (30) is arranged between the clamping device (40) and the rail (20) and releasably clamps the rail (20) in an installation situation in a predetermined position in the support device (10).

A hydrostatic pressure guide mechanism includes: a guide member having a smooth guide surface; a movement member having a slide surface facing the guide surface and an annular placement groove formed on the slide surface; an annular seal member (hermetically closing member) that is disposed in the placement groove and capable of hermetically contacting with the guide surface; an oil supply structure configured to supply an oil into a static pressure pocket on the slide surface surrounded by the seal member; and an oil recovery structure configured to recover the oil from the static pressure pocket, in which the oil recovery structure has a recovery hole that is formed in the static pressure pocket and is opened on the slide surface.

A spindle assembly configured to be assembled in a machining device. A front cover of the spindle assembly includes passages to allow high pressure fluid to flow towards the blades of the turbine and rotate the turbine; openings located at the front end of the front cover may allow low pressure fluid to flow out of the spindle assembly; passages extending from behind the turbine to the front end of the front cover may allow collection of low pressure fluids that flow towards the rear end of the spindle after hitting the blades of the turbine and to direct these fluids towards the front end of the front cover and out of the spindle assembly. The housing of the spindle assembly may include a rear section configured to be assembled onto the machining device.

Provided is a motion guide device including a track rail in which a rolling body rolling groove is formed and a movable block which is mounted on the track rail via a plurality of rolling bodies. The movable block includes a movable block body which has a loaded rotting body rolling groove forming a loaded rolling body rolling passage in cooperation with the rolling body rolling groove and has a non-loaded rolling body rolling passage, return members in which inner peripheral-side direction change grooves connecting the loaded rolling body rolling passage and the non-loaded rolling body rolling passage are formed, and end plates. The end plate has a rolling body scooping aim protruding in a direction of a connection surface with the movable block body and a rolling body scooping groove continuous with the outer peripheral-side direction change groove is formed in the rolling body scooping arm.

A machine tool includes: a movably configured saddle; and a bed having a sliding surface supplied with a lubricant and allowing the saddle to slide thereon, and receiving the weight of the saddle. The sliding surface has a recess continuously extending in a direction in which the saddle moves. By this configuration, a machine tool which easily holds a lubricant on a sliding surface and a method for producing a structure for the machine tool having the sliding surface are provided.

A high-speed low runout spindle assembly is provided. The spindle assembly includes a friction drive wheel configured to be coupled to an output shaft of a motor. The friction drive wheel is configured and disposed to directly contact a shank of a bit. A set of bearings is configured to contact the shank of the bit. A bit clamp assembly includes a clamp bearing having a central through-hole dimensioned to accept a lower portion of the shank of the bit. The bit clamp assembly is configured to hold the bit in contact with the set of bearings.

The invention relates to a drive mechanism (1) for rotatably coupling a first system part or machine part, preferably an assembly (A), to a base, pedestal or frame or to another system part or machine part, for example for rotary positioning during the processing of large workpieces or during the moving of loads, which drive mechanism comprises two ring-shaped connecting elements (3, 4) each having at least one planar connecting surface (5, 6) and fastening means (7, 8) that are arranged distributed in a crown shape therein and effect connection to different system parts or machine parts or the like, said two connecting elements (3, 4) being arranged concentrically with each other and radially one inside the other with a gap-shaped interspace (9) in which are disposed one or more rows of rolling elements (14, 15, 16), each row whereof rolls between two respective raceways (17, 18) on the two connecting elements (3, 4), thus enabling same to rotate relative to each other, at least one connecting surface (5, 6) and at least one raceway (17, 18) being formed by machining or shaping a common base body. The invention is characterized in that at least one fully circumferentially extending row of magnets (40) is arranged inside the gap (9) on one connecting element (3, 4) and at least one fully circumferentially extending row of coils (38) is arranged directly opposite said magnets on the other connecting element (4, 3). According to the invention, at least one fully circumferentially extending row of magnets is arranged inside the gap on one connecting element and at least one fully circumferentially extending row of coils is arranged directly opposite said magnets on the other connecting element.

A wedge drive is provided having a first and a second wedge drive part and an adjustable guide apparatus, formed at least in part by the first and second wedge drive parts, which are movable, by means of a stroke directed in a stroke direction (Z), toward each other in a sliding direction (X, X′, X″) determined by the guide apparatus and at an angle to the stroke direction (Z), guided by the guide apparatus, wherein a guide part of the guide apparatus is movable along a forced guidance surface by adjusting the position of an adjustment surface and a guide play can be set as a result, wherein a normal vector (N) of the forced guidance surface is at an angle to a plane of movement spanned by the stroke direction (Z) and the sliding direction (X, X′, X″).

A hydrostatic bearing apparatus includes a bearing metal having a hydrostatic portion that allows a grinding wheel shaft to be rotatably supported. The hydrostatic portion has a bearing clearance, a bearing surface portion, a plurality of pockets, and partition plates. Clearances are each formed between the corresponding partition plate and an edge of the corresponding pocket in a rotating direction of the grinding wheel shaft. The clearances are formed in the pocket at upstream and downstream ends in the rotating direction. The bearing clearance has a first bearing clearance and a second bearing clearance. The second bearing clearance is larger than the first bearing clearance.