Abstract: There is provided a machine tool for suppressing the adverse effect of run-out of the rear end of a spindle on the rotation detection accuracy when processing a workpiece within a processing area. The machine tool includes a rotation driver, the spindle that is rotated by the rotation driver, a rotational angle detector that is provided to face a part forming the spindle in order to detect a rotational angle of the spindle, and at least two bearings that support the spindle and are arranged on a side of the processing area with respect to the rotation driver. The rotational angle detector is arranged at a position on the side of the processing area with respect to the rotation driver, the position being on the side of the processing area with respect to the bearings, on a side of the rotation driver with respect to the bearings, or between the bearings.

Abstract: There is provided a machine tool for suppressing the adverse effect of run-out of the rear end of a spindle on the rotation detection accuracy when processing a workpiece within a processing area. The machine tool includes a rotation driver, the spindle that is rotated by the rotation driver, a rotational angle detector that is provided to face a part forming the spindle in order to detect a rotational angle of the spindle, and at least two bearings that support the spindle and are arranged on a side of the processing area with respect to the rotation driver. The rotational angle detector is arranged at a position on the side of the processing area with respect to the rotation driver, the position being on the side of the processing area with respect to the bearings, on a side of the rotation driver with respect to the bearings, or between the bearings.

Abstract: A machine-tool spindle device includes: a spindle; a front housing for rotatably supporting the spindle; a first drive motor having a first rotor installed securely on the spindle and a first stator installed securely within the front housing; a rear housing installed on a rear end side of the spindle in the front housing; a second drive motor having an annular second rotor which is disposed coaxially to the spindle near a rear end of the spindle and which is supported rotatably within the rear housing, and a second stator installed securely within the rear housing; a connecting mechanism for connecting the rear end of the spindle and the second rotor and releasing the connection; and a clamping mechanism, disposed within the attaching hole of the spindle and within the second rotor, for clamping a tool attached to the spindle.

Abstract: A machine-tool spindle device includes: a spindle; a front housing for rotatably supporting the spindle; a first drive motor having a first rotor installed securely on the spindle and a first stator installed securely within the front housing; a rear housing installed on a rear end side of the spindle in the front housing; a second drive motor having an annular second rotor which is disposed coaxially to the spindle near a rear end of the spindle and which is supported rotatably within the rear housing, and a second stator installed securely within the rear housing; a connecting mechanism for connecting the rear end of the spindle and the second rotor and releasing the connection; and a clamping mechanism, disposed within the attaching hole of the spindle and within the second rotor, for clamping a tool attached to the spindle.

Abstract: A machine tool capable of structuring a turret disposed at a lower portion of a slant face to be movable in the Y-axis direction without causing an increase in the entire machine in size, in which a first turret 5 is structured to include a base member 8 disposed on a bed 2 in a movable manner in a Z-axis direction, a slide base 9 disposed on the base member 8 in a movable manner in an X-axis direction, a pair of X-axis feed mechanisms 10, 10 moving the slide base 9 in the X-axis direction, a ram 11 disposed at a portion of the slide base 9 and between the pair of X-axis feed mechanisms 10, 10 in a movable manner in a Y-axis direction being orthogonal to a plane including the X-axis and Z-axis, and a turret body 12 and a turret head 13 mounted on the ram 11, is provided.

Abstract: A turret for use on a machine tool has a turret body, a swivel drum, an indexing actuator, a drive motor and a joint. While one of rotating tools on the turret is indexed to an indexed position, the joint directly connects the rotating tool to the drive shaft of the drive motor to rotate the rotating tool with the drive motor. The drive motor is fixed to the turret body and the drive motor has a housing supported on the turret body. The turret further comprises a liner whose thickness is adjustable disposed immediately behind the housing. The liner has the thickness thereof adjusted to adjust a position of the drive motor with respect to the turret body. The drive motor can be highly accurately assembled onto the turret body through an opening, of the turret body, which provides easy access to the turret body.

Abstract: A turret for a machine tool is provided with: a turret body; a swiveling drum on which a tool holder for holding the rotating tool is mountable; a swiveling and indexing drive portion for swiveling the swiveling drum with a swiveling and indexing motor and for indexing any desired rotating tool; and a rotational driving motor, having a rotating shaft directed to an index position, incorporated into the swiveling drum and supported to the turret body. Under the condition that the rotating tool is indexed, a holder shaft of the tool holder of the rotating tool and the rotating shaft are coupled directly with each other and thereby the rotating tool is rotated by the rotational driving motor. Thus, when the rotating tool is drivingly rotated, the power transmission efficiency for rotational drive is high to thereby make it possible to reduce the heat generation, vibration and noise.

Abstract: A turret for use on a machine tool has a turret body, a swivel drum, an indexing actuator, a drive motor and a joint. While one of rotating tools on the turret is indexed to an indexed position, the joint directly connects the rotating tool to the drive shaft of the drive motor to rotate the rotating tool with the drive motor. The drive motor is fixed to the turret body and the drive motor has a housing supported on the turret body. The turret further comprises a liner whose thickness is adjustable disposed immediately behind the housing. The liner has the thickness thereof adjusted to adjust a position of the drive motor with respect to the turret body. The drive motor can be highly accurately assembled onto the turret body through an opening, of the turret body, which provides easy access to the turret body.

Abstract: A turret for a machine tool is provided with: a turret body; a swiveling drum on which a tool holder for holding the rotating tool is mountable; a swiveling and indexing drive portion for swiveling the swiveling drum with a swiveling and indexing motor and for indexing any desired rotating tool; and a rotational driving motor, having a rotating shaft directed to an index position, incorporated into the swiveling drum and supported to the turret body. Under the condition that the rotating tool is indexed, a holder shaft of the tool holder of the rotating tool and the rotating shaft are coupled directly with each other and thereby the rotating tool is rotated by the rotational driving motor. Thus, when the rotating tool is drivingly rotated, the power transmission efficiency for rotational drive is high to thereby make it possible to reduce the heat generation, vibration and noise.