Abstract: A tool for installing or removing a threaded member as for example a thread protector onto a second threaded member, as for example, the pin or box of an oilfield tubular, which has a jaw for selectively gripping an outer surface of a thread protector, a bridge interconnecting the jaw and a cam, the cam being selectively engageable with the inner surface of the thread protector, the cam being operatively connected to a lever for moving the cam from a first position out of contact with the inner surface of the thread protector to a second position in gripping engagement with the inner surface of the thread protector.

Abstract: A computer numerically controlled (CNC) machine has a chuck (2) rotatable about a first axis (A) and a V-block clamp (#) for clamping a workpiece (4) with its central longitudinal axis (C) extending parallel to the first axis (A). The offset (d) between the axes (A) and (C) is known or calculated and the CNC machine is programmed to compensate for the offset (d) during operation of a cutting tool (5) upon the workpiece (4). The V-block clamp (3) can accommodate workpieces of different diameters without having to align the central longitudinal axis (C) of each workpiece to coincide with the axis of rotation of the chuck (2), resulting in a reduction in set up time and an increased concentricity of a ground workpiece compared with conventional CNC grinding machines.

Abstract: A sprocket wheel or double helical gear loader for a machine which generates gears by pinion shaped cutters. The machine includes a gear bearing table having a centering device and a rotatable supporting base. The loader includes a turntable which advances step-by-step about an axis of rotation of the base. The turntable includes on its periphery a plurality of gear holders, which can be intermittently positioned at cutting stations and a discharge station of completed gears. A gear is secured to the turntable through gripping arms, which surround the gear about a whole of the gear perimeter except for an aperture. A cutter passes through the aperture. The gripping arms are movable to accommodate gears of different sizes.

Abstract: A method of repairing a drill pipe having first and second connector ends, each of the first and second connectors ends including a threaded portion and sealing portions, with a lathe having a chuck with longitudinally spaced first and second sets of jaws, the method comprising the steps of mounting the drill pipe in a lathe, gripping the first connector end of the drill pipe with each of the first and second sets of jaws, orienting the first connector end by manipulation of the first and second sets of jaws into a working position; and rotating the drilling pipe against a working tool to machine the threaded portion and sealing portion of the first connector end and produce a new threaded portion and sealing portion of the first connector end. A lathe with longitudinally spaced first and second sets of jaws is also disclosed. A device for positioning of subsequent workpieces without repeating alignment steps is also disclosed.

Abstract: A power chuck system is disclosed featuring a motor, a harmonic drive and a chuck. The harmonic drive is arranged with an input member driven by direct connection with the motor rotor, and an output member directly connected to a long stroke jaw actuation device, providing an integral unit which rotates together with the spindle during machining. During jaw adjustment, an electromagnetic brake releasably connects the motor stator with the spindle and chuck body. Gripping force adjustment is achieved by adjusting the motor torque. The inertial forces of the rotating components are overcome by controlling the motor torque and velocity as gripping ensues, and therefore both high and low gripping forces may be accurately achieved with high speed jaw adjustment. Jaw position and workpiece diameter measurement with a feedback capability are made by use of a rotary encoder.

Abstract: A shaft bearing for mounting the shaft ends of a rotating workpiece to be machined, especially an intaglio printing cylinder, has a rotatably mounted clamping chuck clamping the shaft end and having a hollow clamping head. The clamping head has gripping parts mounted so as to be radially adjustable relative to the longitudinal axis of the clamping head. Each gripping part is mounted rotatably about a pivot axis extending parallel to the longitudinal axis, and is guided, in a region distant from the pivot axis, along an arcuate guide track extending around the longitudinal axis. Each gripping part is configured so as to extend at a decreasing distance from the longitudinal axis and being movable relative to the guide track for the purpose of clamping the shaft end.

Abstract: The present invention relates to a clamping device for clamping a mandrel to an elbow or pipe as well as to a torque-reacting device between a power unit housing and the mandrel. The torque reacting device has a pair of torque reacting keys mounted in a non-rotatable portion of the power unit housing, each of the keys having an end portion with converging opposite sides. The end portions of the torque reacting keys extend into correspondingly shaped, axially extending grooves formed in opposite sides of the mandrel. The opposite sides of the grooves are outwardly diverging and define an included angle approximately equal to the angle between the converging sides of the torque reacting keys. Adjusting screws are provided for each of the torque reacting keys. The clamping device has a plurality of clamping pins, each pin having a generally cylindrical shape with a hemispherical end portion defining a plurality of concentric ridges.