Hardinge Brothers, Inc.

Hardinge, Inc.

Roger R Smith

Kamalakar K Rao

Donald N Terwilliger

Matthew C Roberts, Jr

K Kamalakar Rao

A force limiting workpiece holding device for holding a workpiece in a workpiece processing assembly having a spindle and a closer that applies a force, comprises a workpiece holder slidably mounted to the spindle. The workpiece holder includes a plurality of circumferentially-spaced gripping segments that are movable between expanded and contracted positions to grip and release a workpiece. A force limiting coupling structure includes a biasing structure having a spring force. The coupling structure is operatively mountable between the workpiece holder and the closer such that a force applied by the closer to move the gripping segments of the workpiece holder between the expanded and contracted positions is transferred to the workpiece holder through the coupling structure and the biasing structure thereof, whereby a resultant force being applied to the workpiece holder by the closer is limited to the spring force of the biasing structure.

Force limiting workpiece holding device

An expanding, inner diameter gripping collet assembly for a pick-off spindle. An arbor base is connected to the pick-off spindle and is moveably connected to a moveable arbor. The moveable arbor engages and is driven by the pick-off spindle nose. The moveable arbor has motion-translating cam surfaces on one end that engage corresponding surfaces on one end of an expanding collet. A drawplug having motion-translating cam surfaces that engage corresponding ones on the other end of an expanding collet is inserted through the moveable arbor and secured into the arbor base. The collet assembly also includes an ejector housing, in which an ejector is positioned for sliding movement. A compression spring biases the ejector forwardly.

Expanding collet assembly for pick-off spindle

An expanding collet assembly comprises an arbor having a flange portion for securing to a machine tool spindle and a shaft portion extending from the flange portion. The shaft portion includes a first conical surface disposed at its free end and a second conical surface disposed adjacent the flange portion. Conical surfaces are parallel to each other and disposed radially inwardly in the direction away from the flange portion. An expanding collet having alternately disposed slots to form a plurality of fingers extend inwardly from opposite collet ends and have inner conical surfaces at the collet ends that cooperate with the first and second conical surfaces. The expanding collet is axially slidably disposed around the shaft portion between a relaxed position when the collet is disposed away from the flange portion and an expanded position when disposed toward the flange portion. A draw plug with a flanged head in engagement with one end of the collet is disposed axially through the arbor in an opening in the shaft portion. A draw bar adapter is disposed within a recess in the arbor and secures one end of the draw plug, the adapter being secured to a draw bar for axially actuating the draw plug, thereby actuating the collet. An annular work locating stop is secured to the flange portion and overlies at least a portion of the collet, the stop having an annular free edge for abutting against a workpiece. Another embodiment of the expanding collet assembly for smaller workpieces is also disclosed.

Expanding collet assembly

A collet chuck for holding a tool or workpiece on a spindle of a machine tool. The collet chuck has a hollow collet mount having a rear end to be attached to the spindle. A plurality of radially disposed holes extending from the exterior surface to the interior surface of the collet mount. A cam surface is disposed adjacent the front end on the interior surface. The chuck also has a two-piece, tubular collet with a collet cam adjacent the front end on the exterior surface for interacting with the cam surface of the collet mount. The two-piece collet comprises a collet head with an annular groove adjacent the rear end and a hook portion between the rear end and the groove, and a collet body with a flange portion at its front end. The flange portion of the collet body engages the hook and groove of the collet head. A slot associated with each radially disposed hole is provided in the collet body. The collet body has a draw bar adapter which is threaded to the draw bar mechanism of the spindle in such a way as to limit the stroke length of the collet. A stop member is disposed inside the tubular collet at a clearance from the interior surface of the collet. A pin passes through each radially disposed hole and associated slot and is fixed to the stop. A spring corresponding to each pin is provided for biasing the pin toward the rear of the collet mount. Screws are provided for adjusting the tension of the spring. When the collet is displaced, the collet cam interacts with the cam surface on the collet mount to close the collet, but the displacement of the collet does not affect the axial position of the stop.

Collet chuck

Tool holder for a drill bit or the like

Tool holder for drill bit or the like

A live tooling turret assembly comprising a stationary housing, a turret top plate movably mounted on the housing for axial and rotational displacement with respect to the housing, the turret top plate including a drive shaft extending into the housing and through the top plate, the turret top plate including means for mounting live tooling, the drive shaft including means for engaging and driving the live tooling when mounted on the top plate, supporting means in the housing supporting the top plate including the drive shaft, the supporting means being movably mounted in the housing for axial and rotational displacement simultaneously with the top plate, indexing means associated with the housing for moving the top plate and the supporting means axially and rotationally with respect to the housing, and drive means associated with the drive shaft for permitting the drive shaft to be driven independently of the indexing means and for permitting the drive shaft to be driven simultaneously with the indexing means when the indexing means is moved axially and rotationally with respect to the housing.

Growing community of inventors

Erin, NY, United States of America

Roger R Smith