The invention relates to an expanding clamping sleeve for an expanding chuck having a first and a second bearing section, a clamping section that can grasp a tool, and a thrust section that is arranged between the clamping section and the first bearing section. The invention further relates to a toolholder having such an expanding clamping sleeve, wherein a contact surface is provided for a tool-side stop. The invention finally relates to a method for clamping a tool using an expanding chuck, in which, in a first step, a shaft of the tool is inserted into the expanding chuck, then the expanding chuck is subjected to pressure so that a clamping section of the expanding chuck clamps the tool shaft in the radial direction, and a thrust section of the expanding chuck displaces the tool shaft in the axial direction so that a tool-side stop is forced against a contact surface of a toolholder with an axial minimum clamping force.

A method of determining pull-out of a cutting tool mounted in a rotatable tool holder includes the steps of rotating the tool holder and thus the cutting tool, machining a work piece with the rotating cutting tool, measuring an axial position of the cutting tool in the tool holder during machining by a position sensor in the tool holder, calculating an axial displacement from an initial position of the cutting tool by the measured axial position, and determining pull-out of the cutting tool when the axial displacement exceeds a threshold value. A rotatable tool holder for a cutting tool, a machine tool system including a rotatable tool holder and use of the tool holder and machine tool system is also provided.

A chucking apparatus for a workpiece with honeycomb structure includes a table that can be supplied with vacuum and a clamping plate which can be placed on the table and which accommodates the workpiece in the region of an already profiled surface determined by the face ends of the honeycombs, whose receiving surface, which corresponds to the profiled surface of the workpiece, is provided with suction openings to the table. In order to provide advantageous chucking conditions, the clamping plate has an open-cell structure.

A tool holder with a main part, a deformable receiving portion for clamping a tool, and at least one blocking element which is designed to engage into a corresponding counter element on the tool in order to prevent the tool from moving axially out of the tool holder. The at least one blocking element is integrally formed with the receiving portion. A clamping system having such a tool holder and a method for producing a receiving portion for such a tool holder are also described.

A device for machining a gear using a rotating machining tool. The device has a motor spindle having a drive motor and motor spindle shaft drivable by the drive motor for driving the machining tool. The device has an attachment structure for releasably attaching the device to a work spindle of a tool head. The attachment structure is configured so the tool axis is parallel to the work spindle axis when the device is attached to the work spindle. A device is further disclosed to connect a machining tool to a counter bearing in a simple manner. For this purpose, the counter bearing has a hollow shaft. A mandrel having first and second clamping regions are arranged at positions along the longitudinal axis of the mandrel. The mandrel is inserted through the hollow shaft along the tool axis into a longitudinal bore of the machining tool.

A planarization apparatus comprising a superstrate chuck is provided. The superstrate includes a plurality of inner lands protruding from a surface of the superstrate chuck and a peripheral land protruding from the surface of the superstrate chuck along a periphery of the superstrate chuck and encircling the inner lands therein. The peripheral land has a height smaller than a height of each of the inner lands. The peripheral land has a width sufficiently larger than a width of each of the inner lands such that a pressure leakage through the peripheral land is controlled to be less than a threshold.

A chuck table for holding a plate-shaped workpiece under suction includes a suction plate made of porous ceramics and having a plurality of open pores, and a frame covering a side surface and a reverse side, except an attractive suction surface, of the suction plate and having a plurality of suction grooves defined in an upper surface thereof and a fluid communication passage defined therein that holds the suction grooves in fluid communication with a suction source, the frame supporting the suction plate thereon. The suction plate has a porosity in the range from 60% to 70% by volume, and the open pores have diameters in the range from 10 m to 25 m.

A tool holder having a tool receptacle for chucking a tool shaft by frictional engagement, in which the tool receptacle comprises a plurality of annular clamping surfaces spaced apart from one another, which are intended for retaining the tool shaft by nonpositive engagement and are embodied on the inner circumference of a tube part, and the tube part has a recess in the material for varying its clamping action; the recess in the material is embodied by a plurality of annular channels extending in the circumferential direction, which are each separated from the tool receptacle by a resilient wall portion, which on its side facing away from the channel embodies the respective clamping surface.

Hydraulic expansion chuck with a basic body, with an expansion bush which is received in the basic body and defines a reception space for a tool to be clamped, and with a pressure chamber which is delimited between the expansion bush and the basic body. A securing pin extends through the basic body and the expansion bush into the reception space. Also broadly contemplated herein is a method for producing a hydraulic expansion chuck via: providing a basic body with a blind hole, into which an internal thread is cut. An expansion bush is then soldered into the basic body. Finally, an orifice is made at the bottom of the blind hole and extends through the material of the expansion bush into a tool reception space which is delimited in the expansion bush.

A hydraulic tool holder comprises a body and a piston assembly. The body defines a fluid reservoir adapted to hold a fluid. The piston assembly comprises a piston pin movably arranged within the body and including a first end in communication with the fluid reservoir, and a visual indicator. An elastic element of the piston assembly biases the piston pin toward the fluid reservoir with a predetermined elastic force. The predetermined elastic force is selected such that the visual indicator is visible from an exterior of the body when a pressure of the fluid in the fluid reservoir reaches a predetermined minimum threshold level.