Abstract: Chuck arrangement (100) comprising at least three chuck jaws (110, 120, 130), each arranged to be radially displaceable into a respective clamping position in which it applies a radial clamping force (C) to a held workpiece (W). Each chuck jaw comprises fixing means. The chuck arrangement further comprises one respective counterweight (140, 150, 160) associated with each of said chuck jaw and mechanically connected to the chuck jaw in question so that the counterweight pulls the chuck jaw in a pull direction having a non-zero component radially towards a centre of rotation of the chuck arrangement as the chuck arrangement as it rotates. The invention is characterised in that each one of the said counterweights comprises at least one slot for a detachable weight. The invention also relates to a method.

Abstract: Chuck arrangement (100) comprising at least three chuck jaws (110, 120, 130), each arranged to be radially displaceable into a respective clamping position in which it applies a radial clamping force (C) to a held workpiece (W). Each chuck jaw comprises fixing means. The chuck arrangement further comprises one respective counterweight (140, 150, 160) associated with each of said chuck jaw and mechanically connected to the chuck jaw in question so that the counterweight pulls the chuck jaw in a pull direction having a non-zero component radially towards a centre of rotation of the chuck arrangement as the chuck arrangement as it rotates. The invention is characterised in that each one of said chuck jaws comprises a radially displaceable backing chuck jaw part (113, 123, 133) and a clamping chuck jaw part (114, 124, 134) and that the backing chuck jaw part is mechanically connected to the counterweight. The invention also relates to a method.

Abstract: Backing and clamping chuck jaw part (110, 120), respectively, arranged to engage with each other such that respective contact surfaces (113, 123) a rearranged to come into contact with each other so as to together form a chuck jaw (100) for a chuck (10). The invention is characterized in that the backing chuck jaw part is manufactured from a harder metal material than a metal material from which the clamping chuck jaw part is manufactured, in that a the backing chuck jaw part comprises a convex structure (126), and in that the convex structure is arranged to engage with a corresponding concave structure (116) of the clamping chuck jaw part so that the said concave structure is permanently deformed as a result of an engagement between said structures resulting from the chuck jaw parts first being arranged in a contacting orientation and thereafter being pressed together into an engagement orientation, in which contact is established between said contact surfaces.

Abstract: Backing and clamping chuck jaw part (110, 120), respectively, arranged to engage with each other such that respective contact surfaces (113, 123) a rearranged to come into contact with each other so as to together form a chuck jaw (100) for a chuck (10). The invention is characterised in that the backing chuck jaw part is manufactured from a harder metal material than a metal material from which the clamping chuck jaw part is manufactured, in that a the backing chuck jaw part comprises a convex structure (126), and in that the convex structure is arranged to engage with a corresponding concave structure (116) of the clamping chuck jaw part so that the said concave structure is permanently deformed as a result of an engagement between said structures resulting from the chuck jaw parts first being arranged in a contacting orientation and thereafter being pressed together into an engagement orientation, in which contact is established between said contact surfaces.

Abstract: A chuck-related arrangement having a main portion and chuck jaw portions coordinated with the main portion with associated clamping arrangements, wherein one surface of the main portion is provided with a plurality of tracks adapted to displaceably carry chuck jaw portions. Each one of, and/or a chosen number of, clamping arrangements, are individually to be secured to its element solidly secured to its basic chuck jaw portion exposing a rotational cooperation with an external chuck jaw portion over a central axis of rotation. Two or more of the external chuck jaw portions and their peripheral surfaces are formed as one or more recesses in order to cooperate opposed recesses to form clamping surfaces for a work piece and/or formed as one or more, the recesses intermediately oriented, radially extending elevations, causing cooperative elevations after a rotation to form direct clamping surfaces towards the work piece.

Abstract: A chuck-related arrangement having a main portion and chuck jaw portions coordinated with the main portion with associated clamping arrangements, wherein one surface of the main portion is provided with a plurality of tracks adapted to displaceably carry chuck jaw portions. Each one of, and/or a chosen number of, clamping arrangements, are individually to be secured to its element solidly secured to its basic chuck jaw portion exposing a rotational cooperation with an external chuck jaw portion over a central axis of rotation. Two or more of the external chuck jaw portions and their peripheral surfaces are formed as one or more recesses in order to cooperate opposed recesses to form clamping surfaces for a work piece and/or formed as one or more, the recesses intermediately oriented, radially extending elevations, causing cooperative elevations after a rotation to form direct clamping surfaces towards the work piece.

Abstract: The present invention relates to an arrangement (1) for gripping and holding or releasing a material (M), such as material held in a lathe chuck. The arrangement includes a piston-cylinder assembly (2) and a plurality of material gripping and holding or releasing elements, so-called gripping element arrangements (3). The gripping elements are movable between two positions, an open position and a closed position, in response to movements of the piston-cylinder assembly (2). The cylinder-part (22) of the piston-cylinder assembly (2) includes a circular groove (22a) for co-action with rolling support surfaces (12c) associated with said gripping element arrangement (3). The arrangement also includes a separate gripping member (50) which can be readily fitted to the free end-part (3a) of the gripping element (3′) and readily removed therefrom.

Abstract: The invention relates to an arrangement (6) which functions to grip and hold, or release, material (3) with the aid of a number of movable gripping devices (51, 52). A part (57c) which is intended for coaction with the gripping device (51) has a first supportive surface (57g) and a first through-penetrating hole (57h), and the gripping device includes a narrowed part (51a) which, among other things, provides a second supportive surface (51b) which can face towards the first supportive surface (57g). The two supportive surfaces are adapted to abut one another. The gripping device also has a second through-penetrating hole. The centre line (71, 71') of the two holes can be coordinated for common coaction of the holes with a screw (72).

Abstract: The present invention relates to a tool arrangement (5) which includes a parting tool (6) or the like which is intended to cut off or remove a machined section from the raw material (3) held firmly in a holding device (2). Located adjacent the parting tool (5, 6) on the side thereof that is proximal to the raw material (3) is a bifurcate device (7) which is intended to coact with the edge region (3b, 6b) of the raw material that lies proximal to the machined section, at least when parting of the machine section (3a) is completed, so that upon axial movement of the parting tool and/or bifurcate device a given length of raw material will be withdrawn from the holding device (2). The invention also relates to a method of moving the raw material out of the holding device.