Abstract: A spindle device has a housing, a hydrostatic fluid bearing in the housing, a spindle rotatably supported in the hydrostatic fluid bearing, a bracket securely mounted on the housing, a roller bearing on the outer circumference of the bracket concentric with the spindle, a pulley mounted on the roller bearing, and a connector connecting the pulley with the spindle for transmitting rotation of the pulley to the spindle.

Abstract: A lead face machining apparatus for machining a lead face on a cylindrical workpiece. The apparatus includes a spindle unit having the workpiece rotatably mounted on it, an end cam provided rotatably together with the spindle, a first slide table and a second slide table such that each of the spindle unit, first slide table and second slide table has a static pressure fluid bearing structure. The apparatus is further provided with means for supplying fluid to the static pressure fluid bearings in common, whereby the workpiece is least subjected to vibration produced through contact of the end cam by a lead machining unit for machining the workpiece.

Abstract: A positioning device includes an X-direction slide table and a Y-direction slide table which are slidable in directions perpendicular to each other. Stops are adjustable as to their relative positions with respect to the slide tables to define accurate stop positions of the slide tables. Cams and levers shift the slide tables. Biasing devices bias the slide tables against the stops. A linear drive shifts at least one of the slide tables over a predetermined distance against the respective biasing device.