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A centerless grinding machine comprising a grinding wheel on a rotational sleeve supported by a hydrostatic bearing means on a stationary spindle fixed to a grinding wheel table, a regulating wheel supported by a hydrostatic bearing on a spindle fixed to a regulating wheel table, and a blade for sup

A centerless grinding machine comprising a grinding wheel on a rotational sleeve supported by a hydrostatic bearing means on a stationary spindle fixed to a grinding wheel table, a regulating wheel supported by a hydrostatic bearing on a spindle fixed to a regulating wheel table, and a blade for supporting a workpiece. Both wheel tables supporting the corresponding wheel are guided along a hydrodynamic sliding guide way to which a uniform pre-load is applied by hydrostatic bearings, and a servo mechanism is provided to compensate for frictional forces generated on the feed guide way, whereby it is possible to accomplish fine positioning of the corresponding wheel table and to grind the outer periphery of the workpiece with high precision and efficiency.

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A centerless grinding machine comprising: a machine bed; a workpiece supporting blade mounted on said bed; a grinding wheel table and regulating wheel table each slidably mounted on said bed on opposite sides of said supporting blade; a grinding wheel spindle and regulating wheel spindle each having

A centerless grinding machine comprising: a machine bed; a workpiece supporting blade mounted on said bed; a grinding wheel table and regulating wheel table each slidably mounted on said bed on opposite sides of said supporting blade; a grinding wheel spindle and regulating wheel spindle each having opposite ends fixedly mounted on said grinding wheel table and regulating wheel table, respectively, at said ends; a grinding wheel support sleeve and regulating wheel support sleeve each rotatably mounted on a respective one of said spindles, each wheel support sleeve having opposite ends; a grinding wheel and a regulating wheel each mounted on a respective one of said wheel support sleeves; hydrostatic radial bearing means between each spindle and a respective one of said wheel support sleeves; hydrostatic thrust bearing means between each spindle and a respective one of said wheel support sleeves; driving means operatively engageable with one end of each of said wheel support sleeves for driving said wheel support sleeves rotatably; guideway hydrostatic bearing means between each wheel table and said bed providing hydrodynamic sliding guideway means for slidably supporting said wheel table on said bed; a means for applying a uniform pre-loading to at least one of said sliding guideway means through the respective guideway hydrostatic bearing means; and a feed mechanism for positioning said grinding wheel table comprising, a feed screw shaft rotatably mounted on said bed and operatively engaging said grinding wheel table so that rotation of said feed screw shaft moves said wheel table along the grinding wheel sliding guideway means relative to said bed, means for rotating said feed screw shaft, a hydrostatic thrust bearing on said feed screw shaft having axially opposite sides, pressure sensing means for sensing pressure on said axially opposite sides produced by frictional forces generated at said grinding wheel sliding guideway means, a compensating fluid cylinder and piston means operatively engaging between said bed and said grinding wheel table for moving said grinding wheel table by fluid pressure applied to said cylinder, and servo means operatively connected to said pressure sensing means and to said cylinder for operating said cylinder in response to said pressure sensing means for compensating for said frictional forces.