A rotation tool is mounted to a spindle of a machine tool. The rotation tool comprises a cutter holding portion to which blade portion is fixed and a fixing device which fixes a workpiece. The blade portion is disposed at a tip end of the cutter holding portion. The fixing device includes a movement portion formed to be movable in the interior of the cutter holding portion and a pressing device which presses the movement portion to a side toward the workpiece. The fixing device includes a shaft portion rotatably supported relative to the movement portion and a pressing portion which presses the workpiece.

The invention relates to a speed-changing shearing or forming active element insert which is designed to be detachably connected to an active element receptacle of a machine tool, the speed-changing shearing or forming active element insert having a speed-changing unit which is in the form of a hydraulic force/distance transducer, the force/distance transducer comprising a housing, the housing interior of which is supplied with a hydraulic fluid, and the force/distance transducer comprising a first piston which is in oo contact with the hydraulic fluid via one piston end and a second piston which is in contact with the hydraulic fluid via one piston end and the cross-sectional area of which is smaller than the cross-sectional area of the first piston. The invention also relates to the use of the speed-changing changing shearing or forming active element insert in a machine tool.

A drilling method for forming a plurality of through-holes in a plate member includes: a first step of fixing at least one jig, which has a clearance hole, on a bed of a machine tool; a second step of placing the plate member on the at least one jig and fixing the plate member on the bed; a third step of operating the machine tool so that a leading end portion of a drilling tool of the machine tool is inserted into the clearance hole, and forming a first through-hole at a position of the plate member corresponding to the clearance hole; a fourth step of passing a fixing member through the first through-hole, and fixing the plate member on the at least one jig using the fixing member; and a fifth step of operating the machine tool to form a second through-hole other than the first through-hole.

An adjustable clamp for the retention of a vice or work piece onto a slotted worktable. The clamp has a raised rear foot that both spans the standard width of a slot in a slotted worktable regardless of the angle the clamp is secured to the worktable, and generates an increased gripping force at both contact points of the clamp. Its nose accommodates a cylindrical pin recess to accommodate a cylindrical pin to allow the vice to clamp to a vice with a raised peripheral lip. The 30 degree beveled front edge allows the clamp a substantial planar contact surface with the vice or work piece, enhancing stability.

The invention relates to a device for machining a planar workpiece, having a machine stand which has a support surface (application surface) for a planar workpiece, and further having a machining head which can be moved relative to the support surface, which machining head has a tool for machining the workpiece and also has a holding unit (hold-down unit) with a pressure plate whereby the workpiece is pressed against the supporting surface; characterized in that the pressure plate has a structure which is comprised of a plurality of pieces, preferably two pieces, wherein at least one of the pressure plate parts is movable back and forth relative to at least one other pressure plate part, namely it is movable between the application position, in which the pressure plate part presses the workpiece against the application surface when the workpiece is applied to said application surface, and a released position, in which the pressure plate piece is at a minimum distance away from the workpiece when the workpiece is applied to said application surface.

A device for the machining of curved laminar surfaces, having a first part including a tool for machining the concave face of the surface, and first pressure device in contact with the concave face of the surface, a second part including second pressure device in contact with the convex face of the surface, and devices synchronizing the movements of the first and second parts is provided. The tool has a circular shape for the radial machining of the concave face, and the first pressure device has at least one disc parallel to the tool, the tool and disc disposed on a rotary shaft and both having a radius equal to or less than the radius of curvature of the concave face.

The apparatus (1) for clamping workpieces on machine tools comprises: 1 a basic frame (2) attachable to a machine tool (M) for machining a workpiece (P); a first clamping assembly (3) and a second clamping assembly (4) movable between a release position and a clamping position of the workpiece (P); a fluid actuator (5, 6), provided with a fixed portion (5) and with a movable portion (6) connected to a drive assembly (7) associated with the clamping assemblies (3, 4);
wherein the drive assembly (7) comprises a rocker element (9) associated in a rotatable manner with the movable portion (6), which comprises at least one curved thrust surface (10) arranged in thrust contact against the rocker element (9), wherein the rocker element (9) is rotatable on the curved thrust surface (10).

A metal plate includes a machining subject surface. The metal plate includes a first holding portion designed to be held by a chuck and a second holding portion located at a position separated from the first holding portion and designed to be held by the chuck. The method for manufacturing the metal plate includes performing reference surface machining that machines a surface of the second holding portion that is to be held by the chuck into a predetermined shape in a state in which the first holding portion is held by the chuck. The method includes releasing the first holding portion from the chuck and holding the second holding portion with the chuck. The method also includes machining the machining subject surface in a state in which the second holding portion is held by the chuck.

A press mechanism includes a driving mechanism, a connecting plate connected to the driving mechanism, an installation plate, and a press assembly. The press assembly includes a base defining at least one first resisting groove, at least one first press block and at least one second press block positioned on the base. The first press block includes at least one first elastic member and a first connecting block defining at least one second resisting groove. A predetermined distance is defined between the first connecting block and the base, and the first elastic member is received in the first resisting groove and the second resisting groove.

A working machine comprising a working head (1) having a spindle (10) and which is movable in a xyz working space and further comprising a clamping device (2,3) for clamping pieces (100) to be worked by said machine. The clamping device (2,3) comprises first (21, 31) and second (22,32) clamping means which are movable along a z direction between a first operative position, in which they are in clamping contact with pieces (100) to be worked, and a second non-operative position, in which they are at a distance from said pieces (100), said first (21, 31) and second (22, 32) clamping means being fixed with respect to an xy working plane when in said first operative position and being movable together with said working head (1) in said xy working plane when in said second non-operative position, said first (21, 31) and second (22, 32) clamping means being alternatively moved between said first and second position during a working cycle of said working machine.