Abstract: There is provided a linear guide apparatus which, owing to the use of a gap-free braking device in a rolling guide, has a sufficiently high damping capacity. The linear guide apparatus for guiding a linear motion of a movable body along a guide rail on a fixed structure in a machine tool, includes: a rolling guide section including a rolling element for rolling on a rolling element-rolling surface of the guide rail; and a brake section for enhancing the damping capacity of the rolling guide section, the brake section including a pair of brake shoes, having a flexible structure, for sliding on the rolling element-rolling surface of the guide rail.

Abstract: An attachment simplified in structure having resistance to mechanical error, vibration, or heat displacement, provided with a tool mount for rotatably holding a tool, an electric motor for rotating the tool mount, a generator to which rotary force is transmitted from a spindle built in the spindle head for generating electric power to drive the electric motor, and a casing for holding the electric motor and the generator, which is releasably clamped to the spindle head.

Abstract: A portion (14a, 14b) of a chip remover (14) is defined to be vibratory to give an NC machine tool (MT 1) a vibration transferable onto a surface (FS) of a work (13) under a finishing by the NC machine tool (MT1), a decision is made whether the NC machine tool (MT1) enters the finishing, and vibration of the vibratory portion (14a, 14b) is controlled, as the decision is true. A chip removal method and an NC machine tool equipped with a spiral chip remover (113) as a chip remover have various chip removal rules for determining permission/prohibition of the operation of the spiral chip remover (113). This spiral chip remover (113) operates based on commands described in a machining program. When a command in the machining program is executed, the permission/prohibition of the operation of the spiral chip remover (113) is controlled according to the chip removal rules.

Abstract: There is provided a linear guide apparatus which, owing to the use of a gap-free braking device in a rolling guide, has a sufficiently high damping capacity.

Abstract: There is provided a linear guiding apparatus for a machine tool, the system having both of rapid characteristics of a rolling guide which does not deteriorate the precision of movement, and damping characteristics of a sliding guide which is hardly influenced by the load of a movable body. The feed guiding system includes: rolling guides 14a, 14b, 15a and 15b for guiding a horizontal movement while receiving the load of a movable body 12 on a bed 11; a sliding guide including sliding guide ways 16a and 16b, which extend in parallel to the rolling guides and in vertical directions, and slider portions 18a and 18b which slide on the sliding guide ways; and frictional force setting parts for changing the frictional force between the slider portions and the sliding guide ways, to set the magnitude of the frictional force.

Abstract: There is provided a linear guiding apparatus for a machine tool, the system having both of rapid characteristics of a rolling guide which does not deteriorate the precision of movement, and damping characteristics of a sliding guide which is hardly influenced by the load of a movable body. The feed guiding system includes: rolling guides 14a, 14b, 15a and 15b for guiding a horizontal movement while receiving the load of a movable body 12 on a bed 11; a sliding guide including sliding guide ways 16a and 16b, which extend in parallel to the rolling guides and in vertical directions, and slider portions 18a and 18b which slide on the sliding guide ways; and frictional force setting parts for changing the frictional force between the slider portions and the sliding guide ways, to set the magnitude of the frictional force.

Abstract: An attachment simplified in structure having resistance to mechanical error, vibration, or heat displacement, provided with a tool mount for rotatably holding a tool, an electric motor for rotating the tool mount, a generator to which rotary force is transmitted from a spindle built in the spindle head for generating electric power to drive the electric motor, and a casing for holding the electric motor and the generator, which is releasably clamped to the spindle head.

Abstract: A portion (14a, 14b) of a chip remover (14) is defined to be vibratory to give an NC machine tool (MT1) a vibration transferable onto a surface (FS) of a work (13) under a finishing by the NC machine tool (MT1), a decision is made whether the NC machine tool (MT1) enters the finishing, and vibration of the vibratory portion (14a, 14b) is controlled, as the decision is true.

Abstract: Two angular contact ball bearings (5,7) are arranged in a backside combination manner for supporting a machine tool spindle (3), a spindle head body (1) serves as a bearing case for holding the angular bearings, an inner collar (9) is disposed between inner races (5i, 7i) of the angular bearings, an outer collar (13) is disposed between outer races (5o, 7o) of the angular bearings, the outer collar is set to be longer in an axial direction than the inner collar to provide preloads to the angular bearings, the outer collar is made of a material having a smaller thermal expansion coefficient than the bearing case, the machine tool spindle and the inner collar.

Abstract: A tool holder clamp device for spindle, which is for clamping in a screw-fastening manner a shank portion of a tool holder to be incorporated to a spindle (1) in a removably fittable manner relative to a taper hole (9) formed at a distal end portion of the spindle (1), includes a clamp bolt member (23) rotatably and axially movably provided in a central through-hole (19) of the spindle (1) communicating with the taper hole (9), the clamp bolt member (23) having a threaded part (25) to be screwed in a threaded hole axially formed in the shank portion of the tool holder, the clamp bolt member (23) being adapted to fix the tool holder by fastening the shank portion by means of the threaded part (25), and a drive shaft body (29) rotatably and axially movably provided in the central through-hole (19) of the spindle (1), the drive shaft body (29) being adapted by axial movement thereof to engage with the clamp bolt member (23) for drive connection therewith to drive the clamp bolt member (23).

Abstract: Two angular contact ball bearings (5, 7) are arranged in a backside combination manner for supporting a machine tool spindle (3), a spindle head body (1) serves as a bearing case for holding the angular bearings, an inner collar (9) is disposed between inner races (5i, 7i) of the angular bearings, an outer collar (13) is disposed between outer races (5o, 7o) of the angular bearings, the outer collar is set to be longer in an axial direction than the inner collar to provide preloads to the angular bearings, the outer collar is made of a material having a smaller thermal expansion coefficient than the bearing case, the machine tool spindle and the inner collar.

Abstract: An electric path (E) is formed by connecting a spindle (11), a tool (12), a table (4), a base (2), a column (5) and a housing (13) including a capacitor (C0) having the spindle (11) and the housing (13) as electrodes, and electric current is sent to the electric path (E) by a current generator (51). An electro-capacitance change is detected by measuring a current value in the electric path (E) by an electro-capacitance detector (52) to detect a state of a bearing gap between the spindle (11) and the housing (13). No multiple sensors are necessary and the spindle state detector (50) can be simplified.

Abstract: Letting a differential value of a command value of a position command to a position control loop be an input variable, a feed forward compensation value is calculated depending on the input variable and a combination of a proper vibration frequency and an attenuation constant of a vibration in a moving direction of a moving mechanism to be set in a parameter setting manner, and a feed forward compensation is effected for the command value of the position command to the position control loop by the feed forward compensation value.

Abstract: A spindle 51 capable of controlling quantitatively the rotational angle around the center axial line itself is mounted with a turning tool 50; the spindle 51 and a workpiece are allowed to be relatively dislocated by an axial control along at least a plane perpendicular to the rotation axial line of the spindle 51 in such a manner that the relative movement locus L of the spindle center Cs to the workpiece conforms to a geometry to be machined and a required front rake angle .beta. is set, thereby allowing a mutual interpolation motion between the spindle and the workpiece to be performed; and the rotational angle of the spindle 51 is synchronously controlled with a required interrelation to the above-mentioned axial control, whereby the direction of the cutting edge of the turning tool 50 to the machined face of the workpiece is kept at a required direction at the full rotational angle position of the spindle 50 with the required front rake angle .beta.

Abstract: An equipment of a machine tool for exchanging one tool attached to a main spindle into the other tool in a tool pot by memorizing a relative location between a terminated position of the cross rail and an elevator position of the tool pot of the tool-pot magazine mounted at one side of a gate-type column of the machine tool and being provided with corresponding detachable tool therein, calculating necessary movement distance of the tool pot with reference to the relative location, operating the tool-pot magazine by the calculated movement distance by a servo motor, and exchanging one tool attached to a main spindle into the other tool.

Abstract: In apparatus for controlling a rapid feed speed of a movable body, for example a table of a machine tool, by using a ball screw, there are provided a converting device for converting the rotation of the ball screw into a force for reciprocating the table, a position detector which judges whether a nut of the ball screw is at an end of the movement of the nut or at a central portion of the movement for issuing a detection signal and a speed reducing device which reduces the number of revolutions of the ball screw when the detection signal is issued.

Abstract: A machine tool with automatic changeable tables that has an immobile bed unit. Mounted on the bed unit are linear guides. Multiple table units move along the linear guides for mounting and dismounting workpieces. The table units are placed on the linear guides and into position by a transferring drive unit. The present invention allows workpieces to be mounted and dismounted at a remote area while machining is in process.

Abstract: In apparatus for driving a spindle of a machine tool, the spindle being rotatably supported in a spindle housing and received in a took mounting opening adapted to be inserted with a pull stud at a front end thereof, including a took clamping drawbar provided with a collet for clamping the pull stud at a front end of the drawbar, and a device for axially moving the drawbar, there is provided a device interposed between the inner surface of the spindle and the outer periphery of the drawbar for transmitting a torque from the drawbar to the spindle. The drawbar is connected to a source of drive of the spindle.

Abstract: A mechanism for detachably mounting any selected one of several attachments to a hollow spindlehead ram within which a spindle is rotatably supported by a hollow shaft, the latter being capable of both rotary and axial displacement relative to the ram. Both the hollow shaft and the selected attachment are coupled with the ram via Curvic coupling teeth. Further, in order to retain the attachment in positive engagement with the ram via the Curvic coupling teeth, a series of external locking teeth are formed on the hollow shaft at constant circumferential spacings for engagement with a series of internal locking teeth formed on the attachment. The hollow shaft forces the attachment against the ram via the interengaged locking teeth under hydraulic pressure.

Abstract: An automatic pallet changer for replacement of pallets automatically between a pallet magazine storing a plurality of pallets and a pallet table of a machine tool which comprises a rack fixed on the rear of each pallet, a pallet driving pinion engaging with the rack disposed on a side end of the pallet table and a pinion driving apparatus. The pinion is driven to rotate and the rack is moved linearly whereby the pallet is transferred to and from the table of machine tool.