Abstract: A shrinkage device for rapidly shrinking and outshrinking tools, especially hard metal tools, in so-called shrinkage tension chucks using an induction heating coil, wherein a plurality of shrinkage chucks of paramagnetic or ferromagnetic materials can be positioned on a turntable and brought from a position below the induction coil, which can be lowered, into a cooling position.

Abstract: A thread rolling tap including a stem portion, and a thread forming portion having a body with a plurality of thread turns formed on the body and including a front entrance region and a guide region, with the thread turns having each, in the front region in vicinity of the body, inclined pressure flanks forming side surfaces of an acute angle and connected by an outer, arranged radially outwardly with respect to the body, pressure surface formed as a flattening having opposite rounded edges extending along a circumference of a respective thread turn.

Abstract: A method of rotational milling of a thread on a workpiece and including providing a device having a rotatable workpiece spindle for supporting the workpiece and a rotatable milling cutter spindle for supporting a thread milling cutter, and displacing axially the workpiece spindle and the milling cutter relative to each other by a distance shorter than a length of the thread, while rotating the workpiece spindle and the milling cutter spindle with respective rotational speeds a ratio of which is not equal to 1; and displacing radially the workpiece spindle and the milling cutter spindle relative to each other.

Abstract: A thread-cutting apparatus with reversal of the direction of rotation with a sun-and-planet gear with an axially displaceable reversing device for reversing the direction of rotation of a drill, held in the grip of a spindle, which can be pulled out preferably against a length equalization spring after a given drilling head depth has been reached, especially reversing chucks with pressure equalization pipelines, which discharge into an equalization chamber, sealed by a movable wall from the outside air, wherein the reversing device is actuated by an external driving element, which can be actuated by a reversing signal generated by an actuator.

Abstract: A thread cutter, particularly a reversing chuck with a spindle which can be pulled out, has pressure equalizing pipelines which discharge into an equalizing chamber which is sealed from the outside air by a movable wall.

Abstract: A quick-change insert, particularly for hard alloy taps, has a seat for a square end section of the tap forming the rotational connection and a pull-out holding device. In the region of the square end section, at least one indentation is provided for the positive engagement of a locking pin, which is under the tension of a spring, mounted in the quick-change insert with limited longitudinal mobility and, in use, is blocked by an overlapping collar of the chuck body.

Abstract: A thread-cutting chuck for CNC machine technology of rigid tapping, with a clamping means held in a chuck shaft, particularly a collet chuck, for the tap, an accommodating part, which is held in the chuck shaft without clearance in the direction of rotation and, in the axial direction in the tension and compression directions, has a slight axial clearance cushioned by elastomeric connections disposed between the clamping means and the shaft of the chuck.

Abstract: A safety or overload clutch, particularly for thread-cutting chucks or quick-change inserts thereof, has a cylindrical clutch ring and a chuck body mounted coaxially inside the clutch ring, with a ball pocket clutch arranged between the inside surface of the clutch ring and the external surface of the chuck body. The ball pocket clutch provides for an adjustable releasing or disengagement of the torque, whereby one of the surfaces is provided with ball pockets of less depth than the diameter of the clutch balls, and the opposite surface is provided with counterpockets having release or disengagement openings, in which, in case of an overload, the clutch balls can escape against the effect of a spring-stressed axial pressure ring into a stable release position.