An automatic lathe includes a front main spindle holding a workpiece and a turret including a peripheral surface, the peripheral surface being divided into a plurality of turret surfaces, tools being mounted on the turret surfaces, the turret machining the workpiece with any of the tools selected by turning about a Z axis, wherein at least one turret surface of the turret surfaces of the turret has a distance from the Z axis shorter than that of the other turret surfaces.

A machine tool configured to attach multiple tools to a turret is provided to improve the efficiency of a tool exchanging operation and, thus, also the production efficiency. A control device determines whether an expired tool, which is a tool needs to be exchanged, is present among the tools held by the turret. The control device sets a tool exchanging position, which is a position within the movable range of a head section and is a position where the expired tool is exchanged with a new tool. If the control device determines that an expired tool is present, the control device causes a head section driving device to move the head and rotate the turret to position the expired tool at the tool exchanging position.

A tool or workpiece holder with a receiving body and a clamping device for clamping a tool or a workpiece in a receiving opening of the receiving body. The clamping device comprises a first clamping element, which can be moved in a receiving portion of the receiving body at right angles to a central axis of the receiving opening, and a second clamping element, which can be moved relative to the first clamping element at right angles to the central axis of the receiving opening by means of an actuating element. The second clamping element has conical bottom clamping surfaces on the two clamping elements for inserting the tool or workpiece into the receiving opening. An ejecting mechanism is disposed on the first clamping element for ejecting the tool or workpiece from the receiving opening when the clamping elements are moved into a disengaged position.

In some examples, a moveable member including multiple tools is moveable relative to a fixed member to position a selected tool for performing an operation. A first connector half may be included on the fixed member for connecting to one of a plurality of second connector halves included on the moveable member. Movement of the moveable member to position the selected tool for performing the operation moves a respective second connector half associated with the selected tool into connection with the first connector half. In addition, a respective nozzle assembly may be associated with each tool. The respective nozzle assembly may receive multiple fluids including at least one fluid received through the connection between the connector halves. The nozzle assembly includes an inner nozzle that outputs a gas and an annular outer nozzle that outputs a machining liquid to generate a mixture to direct toward a tool-workpiece interface.

Rotating tool holder mountable on a revolving multi-station tool holder turret of a numerically controlled lathe or turning/milling center, the tool holder including a support body that is removably fixable to the turret and including a shaft that is rotatable around a rotation axis and releasably connectable to a drive of said turret, the tool holder further including a motorized drive arrangement that rotates a main body with respect to the support body around a rotation axis autonomously and independently of the rotation of the shaft, in order to position a seat of a cutting/drilling tool, provided on the main body, in a preset angular position.

A coolant coupling device (20) includes: a cylinder chamber (25) provided for a support member (2) for a tool rest (4) in a machine tool and supplied with coolant; a piston (P) movably arranged in the cylinder chamber (25); and a coolant supply flow channel (30) provided for the piston (P) for passing coolant therethrough. The piston (P) is driven by the coolant supplied to the cylinder chamber (25) so that an outlet (32) of the coolant supply flow channel (30) is connected to a coolant inlet port (10) of the tool rest (4) to supply the coolant to the tool rest (4). The piston (P) comprises a cylindrical projection (29) protruding toward and into the cylinder chamber (25), and the coolant supply flow channel (30) has an inlet (34) that opens at an outer peripheral surface of the cylindrical projection (29).

A tool holder for a lathe having a spindle permits improved arrangement of tools on a turret to maximize the allowable workpiece outer diameter for a given tool. A Z-axis feed mechanism moves the spindle and the turret relative to each other in a Z-axis direction along a center axis of the spindle, while an X-axis feed mechanism moves the spindle and the turret relative to each other in an X-axis direction orthogonal to the Z-axis direction. A plurality of tool holders is attached to the turret, each having a tool holding part. At least one of the tool holders holds the tool at a holding position such that, when indexed to a machining position by rotation of the turret, a cutting-edge reference point of the tool is offset with respect to an X-Z plane including a center axis of the turret.

A universal rotating chuck system capable of accommodating multiple small-batch or one-off machining jobs, involving workpieces of different diameter and composition, comprises a rotating chuck having multiple jaws that may be adjusted positionally inward or outward towards the longitudinal centerline of the workpiece or removed entirely. The chuck is rotated by a dual-motor system driving an inner and outer shaft, where the inner shaft is selectively coupled to the outer shafts to rotate independently and adjust the jaws, or rotate alongside the outer shaft to rotate the chuck. In operation, the system is capable of conducting numerous machining operations independent of direct user intervention, including loading/unloading workpieces, loading/unloading tools, measuring tools and workpieces for quality control, and storage.

A machine tool comprises a tool carrier, e.g. in the form of a turret disc (7) that is provided with receptacles (8) for tool holders (9), wherein each tool holder and tool carrier comprise support surfaces associated to each other and devices for fixing the tool holder at the tool carrier. At least one clamping element is provided at the tool carrier (7) that is adjustably supported between a clamping position and a release position in a direction transverse to a tie rod of a tool holder arranged on a slider (22) receptacle of the tool carrier. The clamping element is provided with a first clamping surface (24) that can be brought into engagement with a second clamping surface (35) at the tie rod of the tool holder in a self-locking and releasable manner.

A drilling-milling device comprising a housing; a drive shaft; a spindle; and a brake. The drive shaft and the spindle being coupled to one another by a gear mechanism, and the brake being coupled to the spindle and a braking torque of the brake being transmitted to the housing.