Abstract: A steady rest for centering a rotationally symmetrical workpiece in a space, the rest comprising two housing halves arranged at a distance from one another and connected together, a plate-shaped middle piece disposed between the two housing halves, the middle piece being mounted in the housing halves by means of an actuator piston which can be moved in an axial direction to the workpiece, two linear guide grooves disposed in both opposite large-surface end faces of the middle piece, with the guide grooves running in a cross-shaped arrangement and at an angle to a movement direction of the middle piece, two outer steady rest arms, each mounted in one of the linear guide grooves of the middle piece in a movable arrangement, and a middle steady rest arm attached to the middle piece between the outer steady rest arms.

Abstract: A chuck for a machine tool for supporting rotationally symmetrical components, the chuck being adapted to prevent contamination of a guide groove area, wedge rods and the chuck body, in any operational position of the clamping jaws of the chuck.

Abstract: A steady rest for centering a rotationally symmetrical workpiece in a housing, a guide slide axially adjustable in the housing, an actuator rod in a form-locking connection with the guide slide, and two control surfaces opposite one-another on the guide slide and configured so that the guide slide has a triangular cross-sectional contour, one tip pointing towards the workpiece and the opposite two tips point in toward the actuator rod, a middle steady rest arm in driving connection with the actuator rod, and two outer steady rest arms each on a side next to the middle steady rest arm, and mounted in a swivelling arrangement in the housing, the first free end of which is in contact with a control surface of the guide slide, the second free end gripping the workpiece, forming a three-point mounting with the middle steady rest arm adapted to hold the workpiece.

Abstract: A diaphragm chuck with an operating element inserted in a chuck body and axially movable in relation to the chuck body, a diaphragm attached to a free end of the operating element with the diaphragm secured to the chuck body by its outer circumference, three base jaws in driving connection with the diaphragm, on each of which a centering surface is disposed in a concentric alignment with the axis of the operating element, three clamping jaws attached to the corresponding base jaws, by which a gear to be machined can be clamped and which make contact with the centering surface, and clamping pins, each allocated to one of the clamping jaws, radially aligned and arranged between two teeth of the gear in the clamped condition, such that the diaphragm chucks reliably clamps differently sized gears and gears with different numbers of teeth between the three clamping jaws.

Abstract: A self-centering steady rest (1) for clamping a workpiece (4) on a turning machine, with three holding elements (5, 6, 7) mounted in a housing (2) and held adjustably in a common plane, the two outer holding elements (5, 7) being configured as swivelling angled levers supported in the housing (2) and in a mirror-image arrangement with one another, and the middle holding element (6) is guided in the housing (2) by means of middle piece (8) in a driveable connection with a drive unit (61) to be axially moveable in the direction of the workpiece (4), with control surfaces (9) being provided on the middle piece (8) wherein the two outer holding elements (5, 7) interact with the control surfaces (9) to achieve clamping movements of the three holding elements (5, 6, 7) and are performed by means of a drive device (21, 61) which is operated electrically, and which performs rotational movement that is converted into an axial advance and return movement performed by the middle piece (8).

Abstract: A steady rest for centering a rotationally symmetrical workpiece in a housing, a guide slide axially adjustable in the housing, an actuator rod in a form-locking connection with the guide slide, and two control surfaces opposite one-another on the guide slide and configured so that the guide slide has a triangular cross-sectional contour, one tip pointing towards the workpiece and the opposite two tips point in toward the actuator rod, a middle steady rest arm in driving connection with the actuator rod, and two outer steady rest arms each on a side next to the middle steady rest arm, and mounted in a swivelling arrangement in the housing, the first free end of which is in contact with a control surface of the guide slide, the second free end gripping the workpiece, forming a three-point mounting with the middle steady rest arm adapted to hold the workpiece.

Abstract: A steady rest for centering a rotationally symmetrical workpiece in a space, the rest comprising two housing halves arranged at a distance from one another and connected together, a plate-shaped middle piece disposed between the two housing halves, the middle piece being mounted in the housing halves by means of an actuator piston which can be moved in an axial direction to the workpiece, two linear guide grooves disposed in both opposite large-surface end faces of the middle piece, with the guide grooves running in a cross-shaped arrangement and at an angle to a movement direction of the middle piece, two outer steady rest arms, each mounted in one of the linear guide grooves of the middle piece in a movable arrangement, and a middle steady rest arm attached to the middle piece between the outer steady rest arms.

Abstract: A steady rest for centering a rotationally symmetrical workpiece in a space comprises: two housing halves arranged at a distance from one another and connected together, a plate-shaped middle piece arranged between the two housing halves, the middle piece mounted in the housing halves by means of an actuator piston so it can be moved in an axial movement direction to the workpiece, two linear guide grooves disposed in both opposite end faces of the middle piece, with the linear guide grooves running in a cross-shaped arrangement and at an angle to the movement direction of the middle piece, two outer steady rest arms, each of which has its free ends mounted in each of the linear guide grooves of the middle piece in a movable arrangement, and a middle steady rest arm attached to the middle piece between the outer steady rest arms.

Abstract: A diaphragm chuck with an operating element inserted in a chuck body and axially movable in relation to the chuck body, a diaphragm attached to a free end of the operating element with the diaphragm secured to the chuck body by its outer circumference, three base jaws in driving connection with the diaphragm, on each of which a centering surface is disposed in a concentric alignment with the axis of the operating element, three clamping jaws attached to the corresponding base jaws, by which a gear to be machined can be clamped and which make contact with the centering surface, and clamping pins, each allocated to one of the clamping jaws, radially aligned and arranged between two teeth of the gear in the clamped condition, such that the diaphragm chucks reliably clamps differently sized gears and gears with different numbers of teeth between the three clamping jaws.

Abstract: A self-centering steady rest (1) for clamping a workpiece (4) on a turning machine, with three holding elements (5, 6, 7) mounted in a housing (2) and held adjustably in a common plane, the two outer holding elements (5, 7) being configured as swivelling angled levers supported in the housing (2) and in a mirror-image arrangement with one another, and the middle holding element (6) is guided in the housing (2) by means of middle piece (8) in a driveable connection with a drive unit (61) to be axially moveable in the direction of the workpiece (4), with control surfaces (9) being provided on the middle piece (8) wherein the two outer holding elements (5, 7) interact with the control surfaces (9) to achieve clamping movements of the three holding elements (5, 6, 7) and are performed by means of a drive device (21, 61) which is operated electrically, and which performs a rotational movement that is converted into an axial advance and return movement performed by the middle piece (8).