A chuck for a machine tool includes a body rotatable about a rotation axis and defining a plurality of slots extending radially in the body, a plurality of jaws received in corresponding ones of the plurality of slots, the jaws being radially movable relative to the body between an inward position and an outward position, and for at least one of the plurality of jaws, a sealing layer disposed in the slot receiving the at least one of the plurality of jaws and sealing an interface between opposed lateral sides of the at least one jaw and a surface of the body defining the slot receiving the at least one of the plurality of jaws. A method of sealing an interface between a surface defining a slot of a chuck is also described.

A chuck for a machine tool includes a body rotatable about a rotation axis and defining a plurality of slots extending radially in the body, a plurality of jaws received in corresponding ones of the plurality of slots, the jaws being radially movable relative to the body between an inward position and an outward position, and for at least one of the plurality of jaws, a sealing layer disposed in the slot receiving the at least one of the plurality of jaws and sealing an interface between opposed lateral sides of the at least one jaw and a surface of the body defining the slot receiving the at least one of the plurality of jaws. A method of sealing an interface between a surface defining a slot of a chuck is also described.

A chuck for gripping a workpiece includes: a chuck body; a jaw connected to the chuck body for constrained movement relative to the chuck body along a jaw path in jaw-closing and jaw-opening directions; an actuator body connected to the chuck body for constrained movement relative to the chuck body along an actuator path; and a slider body connected to the chuck body for constrained movement relative to the chuck body along a slider body path. The slider body is connected to the jaw for constrained movement relative to the jaw along a slider-body-to-jaw path. The slider body is connected to the actuator body for constrained movement relative to the actuator body along a slider-body-to-actuator-body path.

The present invention provides a lathe having a speeder device to increase the speed of a workpiece to be worked on by the lathe as compared to the speed of a workpiece to be worked on by the lathe without the use of the speeder device. The speeder device includes a torque arm, a means for stopping rotation of the torque arm, a planetary gearset assembly, an output spindle assembly, and a collet assembly. The means for stopping rotation of the torque rod is secured to a first end of the torque rod and the planetary gearset assembly is operatively connected to a second end of the torque rod. The output assembly is operatively connected to the planetary gear assembly, and the collet assembly holds the workpiece and is operatively connected to the spindle assembly.

In the case of a clamping device (1) for holding a workpiece (3) to be machined by a machine tool (2), which is used in particular as a clamping chuck, vice or zero point clamping system, consisting of a housing (4), a supporting element (6), which is a component of the housing (4) or is fastened thereto, and thereby forms a supporting surface (6'), on which the respective workpiece (3) rests during the machining process, at least one clamping jaw (7) that is mounted in the housing (4) so it is axially movable and a counter-stop formed by the housing (4) or an axially movable clamping jaw (8), between which the workpiece (3) is clamped in the region of the supporting surface (6') or at least three clamping jaws (7, 8, 9) mounted in the housing (4) so they are axially movable, between which the workpiece (3) is clamped in the region of the supporting surface (6'), a reliable and verifiable monitoring of the distance between the workpiece (3) and the supporting surface (6') and/or the clamping jaws (7, 8, 9) is supposed to take place at the clamping device (1) before and during the entire machining process, without extensive constructional measures being required for this. This is achieved in that at least one free space (11) is integrated in the housing (4), the axis of symmetry of which runs perpendicular to the supporting surface (6') and which faces the clamped workpiece (3) with the open front side, and/or that at least one free space (11) is integrated in one of the clamping jaws (7, 8, 9), which free space leads to the respective clamping surface (7', 8', 9') of the clamping jaws (7, 8, 9), that a proximity sensor (12) is inserted in the respective free space (11), that, via the proximity sensor (12), a monitoring area (13) is formed between the supporting surface (6') and the workpiece (3), which is monitored by an analysis unit (14) with respect to the presence of the workpiece (3).

A chuck-claw coupling mechanism includes a coupling member provided in a master jaw, a first resilient member, and an operation unit. The coupling member is movable between a coupling position at which the coupling member is coupled to the claw, and a separation position at which the coupling member is separated from the claw. The first resilient member urges the coupling member toward the coupling position. The operation unit moves the coupling member to the separation position.

The present disclosure improves the accuracy of matching the center of the workpiece with the rotation center of the chuck. It provides a chuck correction method for a chuck including a body, a plunger, and jaws, the body including a rear body and a front body provided in a front side of the rear body, the plunger provided inside the body and configured to move along an axis of the body, and the jaws each configured to move in a radial direction of the axis while guided by the front body along when the plunger moves, the chuck correction method including: a correction step including moving the front body in the radial direction of the axis with a position of the rear body keeping with respect to the axis in a state that a workpiece is clamped in the jaws.

The present disclosure improves the accuracy of matching the center of the workpiece with the rotation center of the chuck. It provides a chuck correction method for a chuck including a body, a plunger, and jaws, the body including a rear body and a front body provided in a front side of the rear body, the plunger provided inside the body and configured to move along an axis of the body, and the jaws each configured to move in a radial direction of the axis while guided by the front body along when the plunger moves, the chuck correction method including: a correction step including moving the front body in the radial direction of the axis with a position of the rear body keeping with respect to the axis in a state that a workpiece is clamped in the jaws.

Machine chuck jaws, and a related method of manufacture, are provided. The machine chuck jaws are formed from an additive manufacturing process and include one or more gripping pads per chuck jaw. An axial stop is also formed from an additive manufacturing process and provides a flat surface for workpiece placement. The gripping pads equally distribute the clamping pressure, and the additive manufacturing process provides unique shaping capabilities and a honeycomb internal cross-section, thereby achieving a lightweight design. The reduction in weight allows for a decrease in pneumatic pressure used to actuate the jaws, resulting in a corresponding reduction in the clamping pressure which helps improve the form of the workpiece being machined.

There is disclosed a chuck jaw (10.1, 10.2, 10.3) for securing a workpiece (12) to a lathe chuck. The chuck jaw (10.1, 10.2, 10.3) includes a jaw body (16) adapted for operative mounting to the lathe chuck. The chuck jaw (10.1, 10.2, 10.3) further includes at least one holding element (18) operatively associated with the jaw body (16) and adapted to engage the workpiece (12). The at least one holding element (18) is moveable between (i) a release condition in which the holding element (18) is released from the workpiece (12), and (ii) an engaged position in which the holding element (18) engages a surface of the workpiece. The chuck jaw (10.1, 10.2, 10.3) further includes a clamping assembly (20) operatively adapted to secure the at least one holding element (18) in the engaged position.