A method for measuring geometric errors of a numerical control turntable based on a four-station laser tracer system includes: establishing a self-calibration coordinate system and calibrating positions of tracking interferometers; respectively placing each of target lenses at three non-coplanar points that are above the numerical control turntable and keep certain distances from the numerical control turntable, controlling the numerical control turntable to rotate at a certain angular interval .sub.j, and based on positions of the tracking interferometers being known after calibration, solving coordinates of each of measurement points in the self-calibration coordinate system using a non-linear least square method; establishing a turntable coordinate system; perform a conversion between the turntable coordinate system and the self-calibration coordinate system; separating six geometric errors of the numerical control turntable using spatial position errors of the three points at a same position and using the linear least squares method.

A machine tool including a rotary table to which a workpiece to be subjected to machining is attached, a motor that rotates the rotary table, a brake that places the rotary table in a clamping state or an unclamping state, a valve that controls fluid supplied from a fluid supply source to the brake for placing the brake in the clamping state or the unclamping state, and a controller that controls the motor and the valve, where the controller determines whether or not rotation of the rotary table by the motor should be executed on the basis of a signal from a pressure switch of a regulator provided between the fluid supply source and the valve.

A changing device for rotary indexing tables has a stand component (12) used as a base component. Through the stand component (12) a shaft (18) passes defining the axis of rotation of tables (2) rotatable by an electric motor which having an interface (20) for coupling concerned tables (2). Tables 2 can be fixed in predeterminable rotational positions relative to a table unit (8) by a clamping device (60). At least two table units (8), differing from each other at least with respect to their clamping devices (60), together with their assigned table (2) as exchange components can be fixed in an interchangeable manner on the base component for their operation.

A fixing device for a multi-axis robot for fixing wood as a processing object during processing by the multi-axis robot, the device including a plurality of fixing units, each of the plurality of fixing units including a support member including a first frame having a longitudinal direction along a vertical direction, a second frame having a longitudinal direction along the vertical direction and positioned away from the first frame in a horizontal direction, and an installation member positioned between the first frame and the second frame in a top view and configured to be able to mount the processing object, and at least one pressing device attached to the second frame, the at least one pressing device being capable of pressing the processing object inserted between the first frame and the second frame against the first frame.

A machine tool including a rotary table to which a workpiece to be subjected to machining is attached, a motor that rotates the rotary table, a brake that places the rotary table in a clamping state or an unclamping state, a valve that controls fluid supplied from a fluid supply source to the brake for placing the brake in the clamping state or the unclamping state, and a controller that controls the motor and the valve, where the controller determines whether or not rotation of the rotary table by the motor should be executed on the basis of a signal from a pressure switch of a regulator provided between the fluid supply source and the valve.

An apparatus (B) controls rotation of an annular member (36) relative to top and bottom housings (12, 10). The bottom housing (10) includes a disk (110) extending radially and terminating in a cylindrical portion (112) having circumferentially spaced slits (212). A wedge (16) abuts with the cylindrical portion (112) and is moved radially between first and second positions by an axially moveable piston (14), with the wedge including an angle surface (340) which interfaces with an angled surface (520) of the piston (14) through a plurality of balls (18). The disk (110) and the cylindrical portion (112) are formed as a single component of material having sufficient material strength and yield to allow engagement and disengagement of the cylindrical portion (112) with the annular member (36). The wedge (16) is slideable between an axial surface (250) of the disk (110) and a guiding flange (450) of the top housing (12).

A machine tool is equipped with a rotary table, and a clamp mechanism which clamps the rotary table in a manner so that the rotary table does not rotate. A clamping operation by the clamp mechanism is started after a standby time has elapsed from completion of indexing of the rotary table. The machine tool further includes a positional deviation calculating unit adapted to calculate a positional deviation of the rotary table when the clamping operation by the clamp mechanism is completed, and a standby time changing unit adapted to shorten the standby time in the case that an absolute value of the positional deviation is less than a threshold value, and to lengthen the standby time in the case that the absolute value of the positional deviation is greater than the threshold value.

A rotary table for a machine tool comprising a stator unit, a rotor unit rotatable at least about a rotational axis, wherein the rotor unit comprises at least one receiving unit for the reception of a workpiece, a first bearing unit for the mounting of the rotor unit in the stator unit, and an electromagnetic motor drive for the motorized driving of the rotor unit. The rotor unit, at least in the region of the motor drive and/or of the first bearing unit, has at least one rotor-cooling apparatus, comprising a cooling medium and at least one cooling surface, for the cooling and/or absorption of waste heat from the motor drive and/or from the first bearing unit.

To provide a rotary table device that can prevent the occurrence of malfunction before it happens. A rotary table device equipped with both or one of a clamping mechanism and purge mechanism which operate by way of working fluid, the rotary table device including: a detection unit that detects a pressure or flow rate of the working fluid; a transition information storage unit that acquires and stores transition information related to transition of a pressure value or flow rate value of the working fluid detected by the detection unit; a judgment value storage unit that stores in advance a plurality of sets of judgment value information related to judgment values for judging a pressure value or flow rate value of the working fluid; and a notification unit that notifies of notification information according to the pressure value or flow rate value of the working fluid, based on the transition information stored in the transition information storage unit and the plurality of sets of judgment value information stored in the judgment value storage unit.

Disclosed is a rotary indexing table (10) having an output flange (12) which is suitable for receiving a workpiece, mounted on a housing (14) of said rotary indexing table (10) for rotation about an axis of rotation (A) and drivingly connected to at least one drive element (24) which engages a driving groove (22) in a cylindrical cam (20) which can be driven by a motor, the cylindrical cam (20) being disposed asymmetrically to the axis of rotation (A) of the output flange (12).