The machine tool comprises a headstock provided with a main spindle; a driving unit which moves the headstock in a main spindle axial direction and has a feed mechanism extended in the main spindle axial direction and a front end supporter which rotatably supports a front end of the feed mechanism; a first front cover mounted on the headstock in a first position between the main spindle and the feed mechanism with respect to a diameter direction from a main spindle axis toward the feed mechanism; and a second front cover mounted on the front end supporter in a second position between the main spindle and the feed mechanism. Part of the feed mechanism is covered by both of the first front cover and the second front cover when at least part of the first front cover is on the rear side of the second front cover.

A rotary table assembly is provided with a rotary table with a workpiece mounting table on one end of a rotating shaft and a cover covering the rotary table. A seal member is disposed between the cover and the workpiece mounting table, thereby preventing foreign matter, such as chips, from adhering to the rotary table.

An additive manufacturing tool configured to couple to a spindle of a CNC machine, comprises a plurality of drive wheels movable between an engaged position wherein they compress filament from a filament source against a drive disc and a disengaged position wherein they are spaced apart from the filament, and a delivery assembly including a heating element and a nozzle having an outlet opening. When the plurality of drive wheels are in the engaged position and the drive disc is rotated, the filament is drawn into the tool from the filament source and routed around the drive disc to the nozzle, where heat transferred from the heating element to the nozzle melts the filament so that the filament flows through the outlet opening.

A spindle includes a housing including a first opening, a bearing housed in the housing, a main shaft rotatably supported by the bearing, a collet chuck in a first through hole defined in the main shaft to grip a machining tool and being movable in an axial direction of the main shaft, a draw bar connected to the collet chuck, and a cover covering the first opening and including a second through hole through which the main shaft is disposed. The main shaft and the cover are disposed at a distance from each other.

A shield holder is configured to be detachably connected to a spindle of a machining tool and has a connection portion configured to be detachably connected to the spindle and a shield portion formed at an end of the connection portion. The shield portion includes a shield body integrally formed with the connection portion and a cushion layer formed on and covering a surface of the shield body. After a workpiece is processed, the shield holder is substituted for a cutter holder and is connected to the spindle for blocking the workpiece pushed out from a clamping device to prevent the workpiece from damage.

A gas-curtain protection device for an aerospace precision machining spindle includes a spindle body, a shaft, a first labyrinth ring, a gas guide ring and a bulkhead ring. The first labyrinth ring and the gas guide ring are mounted around the front end of the spindle body, and the bulkhead ring is mounted around the shaft. The first labyrinth ring has a gas pipe, and the gas guide ring has a gas tank communicated with the gas pipe. The bulkhead ring has a gas guide structure communicated with the gas tank. In use, gas is delivered from the spindle body to the gas tank through the gas pipe, and then guided to the exterior of the spindle body by the gas guide structure so as to form a gas curtain that effectively prevents cutting fluid and chips from entering the interior of the spindle body.

A motor, to which a rotary joint supporting structure for supporting a rotary joint is attached, turns a spindle. The motor includes a motor housing, a rotary shaft having a hollow shape and penetrating through the motor housing in the axial direction of the spindle, a flinger integrally attached to the rotary shaft outside the motor housing and disposed on the side to which the rotary joint supporting structure is attached, and a peripheral wall provided on the motor housing and projecting in the axial direction of the spindle so as to surround the periphery of the flinger. A plurality of cutouts are formed in the peripheral wall so as to establish communication between the interior and the exterior of the peripheral wall.

The present invention relates to embodiments of a machine tool, in particular a multi-spindle milling machine, comprise a machine frame, a workpiece clamping device for clamping a workpiece, an axis slide assembly arranged on the machine frame, and a spindle carrier assembly which is arranged on the machine frame and has at least two tool-carrying work spindles. The axis slide assembly is configured to linearly move the workpiece clamped at the workpiece clamping device by way of three controllable linear axes X, Y and Z. The work spindles are arranged at a turret which can be rotated or swiveled about a turret axis at respectively equal distance from the turret axis, and the spindle axes of the work spindles are aligned or can be aligned in parallel to one another and in parallel to the turret axis.

A rotary machine includes: a stationary body having a stationary-side peripheral surface; a rotating body having a rotating-side peripheral surface facing the stationary side-peripheral surface. One surface which is one of the stationary-side peripheral surface and the rotating-side peripheral surface has an upstream-side peripheral surface, a downstream-side peripheral surface, and a rearward step surface. The other surface has an upstream-side seal fin forming a minute gap between the upstream-side seal fin and the upstream-side peripheral surface; a downstream-side seal fin forming a minute gap between the downstream-side seal fin and the downstream-side peripheral surface. The rearward step surface has a guide surface extending downstream Da2 while directed toward the other surface and connected to the upstream-side peripheral surface.

A machine tool includes a shielding cover, a door, and an automatic tool changer. The shielding cover covers a machining space of a main spindle. The door opens and closes an opening disposed in the shielding cover. The automatic tool changer automatically exchanges a tool to be mounted to the main spindle. The automatic tool changer exchanges the tool to be mounted to the main spindle by turning an arm in a plane perpendicular to the main spindle so as to cause the arm to enter into and exit from the machining space. The arm is configured to grip and release the tool. The turning of the arm is synchronized with the opening and closing movement of the door.