Abstract: A method and device for simultaneous compensation of five existing components of deviation from the ideal linear motion of solid unit moving hydro (air) static slides and using five independent flow control valves whose valves connections to the recesses and commutations between recesses are made in such a way that every valve is responsible for compensation only for one component of deviation.

Abstract: The present invention relates to an improved spindle unit. The spindle unit includes a body, an external shaft placed into the body and rotating on bearings relative to the body, and an internal shaft placed into the external shaft and coupled thereto. The spindle unit further includes front and rear static journal bearings and a thrust bearing between the external and internal shafts. Flow control valves are provided which have their outlets connected to recesses communicating with the rear and front journal bearings. Operation of the valves in response to measured parameters controls the position of the internal shaft relative to the rotation axis of the external shaft. This is accomplished by controlling the flow of fluid to recesses associated with the front and rear journal bearings. By controlling the position of the internal shaft, one can insure that a workpiece attached to the internal shaft is automatically centered.

Abstract: The present invention relates to a spindle unit which is able two work both in a low speed powerful roughing regime and medium and high speed precision semi-finishing and finishing. The spindle unit includes a body, a shaft placed into the body, journal bearings between the body and the shaft, and at least one journal-thrust ball bearing assembly placed between the body and the shaft. A hydraulic or pneumatic cylinder is used to move the shaft in an axial direction. The spindle unit further has a pad placed on at least one side of the hydraulic or pneumatic cylinder. As a result of this construction, the spindle unit can work as a fully restricted spindle unit with and without additional ball bearing support.