A table group for a machine tool is provided. The table group has a support assembly, a table, a ring gear provided with a lower face and an upper face, integral with the table, a plurality of main hydrostatic skids, a detection device for detecting a lifting action generated by the main hydrostatic skids, a plurality of dogs and an electronic management device operatively connected to the main hydrostatic skids, the dogs and the detection device, configured to control the dogs to generate a contrasting action. The lifting action is equal to a predetermined constant nominal load greater than the weight of a semi-finished product and either smaller than or equal to a maximum load which can be borne by the main hydrostatic skids.

A heavy object supporting device includes: a mounting table which is arranged to face a base, and on which a supported object is mounted; an annular sealing member which is arranged between the mounting table and the base and can be elastically compressed in the direction in which the mounting table and the base face each other; and a separation preventing structure which prevents separation between the mounting table and the base. A space, which is defined by the mounting table, the base, and the sealing member, is formed as a fluid-filled space that is sealed in a state filled with fluid. The separation preventing structure is configured to allow the mounting table to be moved relative to the base in the facing direction and the direction orthogonal to the facing direction while maintaining the sealed state of the fluid-filled space.

A compressed fluid supply system comprises: a pressure adjustment unit for adjusting the pressure of a compressed fluid supplied from a fluid supply source to support members supporting a movable member so that the movable member can be driven through the use of the compressed fluid; a drive force acquisition unit for acquiring a drive force of a motor for driving the movable member; and a pressure control unit for adjusting the pressure of the compressed fluid supplied to the support members by controlling the pressure adjustment unit on the basis of the drive force of the motor.

A guide device includes a support that includes a guide surface, and a movable body that includes an oil pocket to which lubricant is supplied and a sliding surface facing the guide surface. The sliding surface includes a first region that is arranged around the oil pocket and formed of a first material, and a second region that is arranged at least partially around the first region and formed of a second material.

A heavy object supporting device includes: a mounting table which is arranged to face a base, and on which a supported object is mounted; an annular sealing member which is arranged between the mounting table and the base and can be elastically compressed in the direction in which the mounting table and the base face each other; and a separation preventing structure which prevents separation between the mounting table and the base. A space, which is defined by the mounting table, the base, and the sealing member, is formed as a fluid-filled space that is sealed in a state filled with fluid. The separation preventing structure is configured to allow the mounting table to be moved relative to the base in the facing direction and the direction orthogonal to the facing direction while maintaining the sealed state of the fluid-filled space.

A control system of a machine tool includes a hydraulic pressure adjuster. The hydraulic pressure adjuster includes a sequence program controller that includes components for adding a function of adjusting a hydrostatic pressure of a static pressure oil supplied to a hydrostatic pressure guide mechanism, which are a pressure setting unit, a constant acceleration motion controller, a workpiece-weight calculator and a supply state adjuster.

An air balance mechanism includes a plate part, fixed shafts, and movable cylinders. A flange is provided at one end of each of the fixed shafts. The movable cylinders are movable relative to the fixed shafts. A space is formed below a lower surface of the flange. Further, the air balance mechanism includes fixing bolts and adjusting bolts. The fixing bolts fix the flange and a plate part at positions different from the space. The adjusting bolts are inserted into the plate part through the space for allowing the postures of the fixed shafts to be adjustable.

A device for supporting and/or guiding a first structure that includes machines, instruments and/or structures in general, particularly for supporting and/or guiding a telescope, relative to a second structure, includes a sliding system with a slide block adapted to slide relative to the second or the first structure; for a fluid, a chamber that is separate from and independent of the sliding system and that includes a first portion fixed to the sliding system and a second portion adapted to be associated with the first or the second structure; a fluid circuit that is also separate from and independent of the sliding system and that communicates with the chamber to control the passage of the fluid into and from the chamber; and an elastic member housed in the chamber to absorb the oscillations between the first and the second portion.

A device for supporting and/or guiding a first structure that includes machines, instruments and/or structures in general, particularly for supporting and/or guiding a telescope, relative to a second structure, includes a sliding system with a slide block adapted to slide relative to the second or the first structure; for a fluid, a chamber that is separate from and independent of the sliding system and that includes a first portion fixed to the sliding system and a second portion adapted to be associated with the first or the second structure; a fluid circuit that is also separate from and independent of the sliding system and that communicates with the chamber to control the passage of the fluid into and from the chamber; and an elastic member housed in the chamber to absorb the oscillations between the first and the second portion.

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.