Abstract: A carriage 3 is movable in a feed direction A on guideways 1, and carries an ultrasonic machining device 4, 5 loaded with an adjustable force in the feed direction by a first fluid cylinder 7. A cylinder 15 is attached to the carriage, around which is looped 16 a rope 17. One end 18 of the rope is preloaded by spring 20 against a stop 21 which is attached to a frame 2. The other end 22 of the rope is attached to the piston rod 24 of a second cylinder 25. By means of the second cylinder the tool 5 can be lifted or retracted from the workpiece 6 during the machining operation, independently of the position of the carriage. After the tool has been lifted off, the tool touches down gently again on a renewed abrasive layer.

Abstract: An ultrasonic machining device 10 is attached to a movable carriage 3, and has a borehole 11 to whose free end a differential screw 14 is threaded. To clamp a tool 20, first the device is returned to a neutral position whereat a wrench 25, which is mounted stationarily in a frame 2, engages the differential screw which rests on a shoulder of the wrench with low prestress. The wrench is then rotated until the screw projects a specific amount beyond the end of the device. The tool is then threaded onto the screw until it abuts the device 10, and finally the screw is tightened by a pneumatic cylinder 32.

Abstract: An annular sonotrode 5 vibrates at one of its natural frequencies, preferably about four nodes 33-36 equally distributed over its circumference. The vibrations introduced at the input 17 along axis 10 are outputted to a tool 6 along an axis 19 bent by 90.degree.. With this design even difficult to access workpieces can be efficiently machined with ultrasonics.

Abstract: An ultrasonic tool (13) is set into rotational movement to increase the performance of material removal. In addition, a magnetostrictive or piezoelectrical transducer (2) is used, which is coupled to a transformer (7) for amplification of the output amplitude. To lessen the constructional length, transducer and transformer are slid into each other in such a way that their constructional lengths at least partly overlap. Apart from that, transducer and transformer form a rotor which is mounted in non-contact bearings. With a device of this kind, optimal running trueness can be attained.

Abstract: An ultrasonic tool instrument includes an axial assembly of a piezoelectrically driven transducer 1, a mechanical amplifier or booster 2, and an elongate concentrator or sonotrode 3. The abutting end surfaces 26, 33 and centering shoulders 25, 34 of the amplifier and sonotrode are tightly clamped together by a differentially threaded screw sleeve 4 accessed by a rotatable key rod 5 extending through central bores 18, 28 in the transducer and amplifier to ensure the precise axial alignment and centering of the sonotrode.

Abstract: An apparatus for a machine tool for the automatic generation of a switching signal and for reducing the speed of a tool from the advance feed stroke into the work stroke upon approach of the tool at the workpiece. The invention contemplates mechanism for accelerating the tool opposite to the feed direction or stroke and which upon approaching of the tool at the workpiece is electrically actuated by the switching signal.