Abstract: The feed advance speed, or rather its scalar value, of a turning cutting tool edge is varied for a time duration which is short relative to the time duration required for one full revolution of a work piece. The varying of the scalar value of the feed advance speed takes place at non-periodic timed intervals and at least once for each work piece revolution. Thus, a simple control not requiring any enforced phase relationship between tool movements during different revolutions of the work piece, can be applied to a computer numerically controlled machine tool, such a lathe for truing railroad wheels. A work piece surface is achieved which has at least the quality of conventional work piece surfaces produced with substantially more complicated phase controls for the tool movement. Positive chip fracture is also achieved.

Abstract: An elongated grooving or threading tool has a cutting section, an intermediate section including a devibrator body, and a rearward cemented carbide section which are, respectively, held together in axial alignment by a drawbolt which engages the cutting section and cemented carbide section for holding the intermediate section under compression.

Abstract: First and second metal portions are tightened integrally on both surfaces of one or plural sheets of electrostrictive element bodies polarized in the thickness direction and divided in two uniform halves using a tightening tool, thereby a flexible vibrator is provided, and a cutting tool is installed to an output end portion of the flexible vibrator and a work is cut by ultrasonic vibration generated in the flexible vibrator. Workability of the cutting working is improved and the structure is simplified, and the device as a whole is made compact.

Abstract: The present invention includes a radial force detection mechanism for detecting a radial force generated by cutting operation of a cutting tool by use of an ultrasonic vibrator, a depth-of-cut feed mechanism for moving the cutting tool in the depth-of-cut direction, and a vertical feed mechanism for controlling the vertical position of the cutting tool, combined with correction of its movement in the depth-of-cut direction by the depth-of-cut feed mechanism, so as to bring it to the position where a radial force detection signal detected by the radial force detection mechanism becomes zero. By moving the cutting tool in the vertical direction by use of the vertical feed mechanism so that the radial force detection signal may become zero, no radial force is applied to the cutting tool.

Abstract: The present invention provides an ultrasonic oscillation machining apparatus wherein accurate oscillation machining can be attained using a small vertical ultrasonic oscillating element which oscillates with a high frequency. The ultrasonic oscillation machining apparatus comprises a wide oscillating body divided into a plurality of units by one or more slits formed in said wide oscillating body with opposite end portions left thereon, a plurality of vertical ultrasonic oscillating elements secured to one end faces of said individual units of said wide oscillating body for producing vertical oscillations of such a frequency that said opposite end portions of said wide oscillating body are positioned at loop portions of oscillations of the wide oscillating body, and a bite provided at one of said end portions of said wide oscillating body which is positioned at one of the loop portions of oscillations of said wide oscillating body.

Abstract: A vibration sensor, located on a chuck member for a workpiece and rotating therewith, detects the signal emitted at the instant a tool member contacts the workpiece. The vibration sensor produces an output signal to modulate a transmitter and a receiver fastened to the machine tool frame receives the information broadcast by the transmitter. The information is processed to produce a signal which reduces the speed of a motor controlling the advance of the tool member. The speed of the tool member is thus reduced as soon as the tool member contacts the workpiece. The arrangement is particularly suited to machines for grinding interior diameters and prevents damage following accidental collision of the workpiece and tool member.

Abstract: A locking assembly for locking components of a machine tool together including a rotatable bar having wedges reversibly movable thereon for simultaneously engaging wedge receiving spaces of one of the tool components while a portion of the wedges are secured in corresponding space in another tool component to thereby provide full face to face interlocking engagement of the wedges and the tool components. Machine tool components interlocked with the locking assembly of the invention which may include a vibrational energy dissipating cavity are also disclosed.

Abstract: The arrangement enables controlling the speed of advance of the tool part of a machine tool during its approach phase toward a workpiece and reducing such speed as soon as the tool contacts the workpiece.It includes an acoustic sensor adapted to detect the signal emitted at the instant of contact, an electronic circuit for processing such signal and a motor responding to the circuit to regulate the speed of advance of the tool part. The sensor is fastened to a feeler mounted on the machine framework by means of shock absorbers, said feeler being arranged to be in contact with the workpiece or its carrier.