Abstract: A non-destructive device that measures the accuracy potential and relative ballistic coefficient of projectiles, by placing the object tested within a swirling vortex having both a rotational and vertical vector, hovering the projectile essentially above the device, and essentially unencumbered by any stator. A perfectly balanced object hovers and turns at a high rate about its long/vertical axis without contact with the device.

Abstract: A device for measuring the rotational imbalance of a specimen, having a spindle unit with a spindle, which is embodied to hold the specimen and to allow it to rotate at a testing speed, a holder suspension by means of which the spindle unit is anchored to the machine base in pendulum fashion such that the imbalance forces occurring during the measurement operation are able to move the spindle unit back and forth in a predetermined measuring direction M, and a sensor arrangement that detects at least one imbalance parameter occurring in the measuring direction M during rotation of the spindle, wherein the spindle unit is supported by means of at least one auxiliary bearing that is only able to transmit forces in the direction of a normal N to the measuring direction M.

Abstract: A rotatably supporting device for correcting balance of a rotating body includes a journal supporting part having a mandrel that rotatably supports the rotating body in a floating state about a vertical axis, a thrust supporting part that is provided at a lower end portion of the mandrel and supports a bottom part of the rotating body in the floating state, a first fluid supply passage that supplies a fluid for floating between the mandrel and a rotation support hole of the rotating body, an annular groove provided in the thrust supporting part so as to face the bottom part of the rotating body, and a second fluid supply passage that communicates with the annular groove to supply a fluid thereto for floating the rotating body.

Abstract: In order to be able to determine the imbalance of rotors (2) with pocket hole bores with great precision in a bearing arrangement with a bearing mandrel (5) for holding a rotor (2), without journals but having a bore (6), in a balancing device, in which the bearing mandrel (5) has orifices (10, 20) for the passage of fluid, a fluid supply to a fluid chamber (40) disposed between the end of the pocket hole bore and the end of the bearing mandrel is provided to form a cushion of fluid with which the rotor is supported in the axial direction.

Abstract: In the case of a bearing with a bearing mandrel for mounting a journal-less rotor with a bore hole in a balancing device, in which the bearing mandrel has openings for fluid to pass through, to be able to determine the imbalance of rotors with bearing possibilities on only part of their axial extent with high precision, in the bearing mandrel first openings for fluid delivery and second openings for liquid removal are provided.

Abstract: A data storage device stabilization mechanism for a servo track writing (STW) nest is disclosed. The stabilization mechanism comprising a baseplate, at least two fixed restraints on the baseplate adapted to receive and position a data storage device on the baseplate, and at least two clamps on the baseplate. The clamps are operable to move between a first position and a second position. In the first position the clamps engage a data storage device positioned on the baseplate by the fixed restraints and apply a restraining force on the data storage device in a direction perpendicular to the disc rotation axis to dampen rotational movement of the data storage device relative to the baseplate. In the second position, the clamps do not engage the data storage device positioned on the baseplate allowing a data storage device to be positioned or removed easily.

Abstract: An unbalanced force sensing apparatus for sensing an unbalanced force produced due to rotation of a cylindrical rotor, the apparatus including a shaft having gas passageways to convey a first gas against the inner surface of the rotor to support the rotor away from the shaft, a second gas for flowing over the outer surface of the rotor to rotate the rotor, and a force sensing means for sensing an unbalanced produced due to rotation of the rotor around the shaft.

Abstract: A force-measuring apparatus has a stationary part, a load receiver, and two parallel guides connected to the load receiver and attachment areas of the stationary part. The load receiver is restrained by the guides to move parallel to the stationary part. An adjuster device adjusts the attachment areas transverse to the guides. It has an arm extending parallel to the guides that can pivot about a pivotal axis on the stationary part. An adjusting member acts on an adjustment area of the arm. The attachment area is located on the arm between the adjustment area and the pivotal axis. The distance from the adjustment area to the attachment area is at least as long as the distance from the attachment area to the pivotal axis. When the adjustment area is adjusted by a given amount, the attachment area is displaced by an amount less than the given amount.

Abstract: A method and apparatus for dynamically balancing a rotating component, such as a compressor wheel, without using an arbor is disclosed. A balancing fixture includes a nest for receiving the compressor wheel and is defined by a balancing surface on the balancing fixture. The balancing fixture is attached to a fixed support by flexures which permit tilting motion of the balancing fixture. Compressed air is communicated into an air manifold within the fixture and is communicated to the balancing surface through pressure jets to thereby support and position the compressor wheel on a cushion of compressed air. Motion of the balancing fixture is transmitted through a bracket to a pair of spaced-apart motion transducers.

Abstract: A device for measuring dynamic balance of a rotor including a shaft to which an impeller is secured at its one end and which has a neck portion adjacent to the impeller so that the shaft may be rotatably supported by a bearing member at the neck portion. The device comprises: a housing member, a thrust bearing secured to the housing member and engageable with the neck portion of the shaft, a support member provided in the housing member beneath the thrust bearing and engageable with the shaft so that the shaft may be rotatably supported in a slanted or a vertical position by the support member and the thrust bearing with the impeller being positioned upward, and a sensor connected to the housing member for detecting the vibration of the housing member caused when the rotor supported by the thrust bearing and the support member is rotated. The dynamic balance of the rotor can be measured by the sensor in terms of the vibration of the housing.

Abstract: A vertical, hard suspension, two plane balancing machine has a suspension cartridge which drops into an aperture in a support plate of the machine base, and a spindle cartridge which slides snugly into bores in the suspension cartridge. The suspension cartridge has two vertically spaced and rigidly interconnected plates, each plate having a bore for the spindle cartridge and having a pair of arcuate slots concentric with the bore defining between the slot ends a pair of resilient webs comprising the machine flexure elements located diametrically on each side of the bore. A force transducer is located in a slot of each plate to measure vibration. The spindle cartridge has a rigid tube containing vertically spaced bearings which rotatably support the spindle. A motor coupled to the spindle through a belt drive is located in the same plane as the webs to minimize the effects of the belt drive forces on the force transducer.

Abstract: A procedure is described for the balancing of rotors without journals, as well as an auxiliary bearing arrangement used to accomplish the balancing of such rotors. Fluids function to separate the rotor being balanced from the journal exterior of the bearing arrangement and also to separate the rotor from the support surface of the bearing arrangement. A high level of precision is achieved while avoiding fixed or expanding mandrels. Improvement of the automated operation of balancing machines of this type is possible without wear on the machine. Also, additional disturbance frequencies are avoided.

Abstract: This invention relates to a process and an apparatus for balancing a body of rotation in two parallel balancing planes disposed perpendicular to the rotational axis of the body. A slotted plate disposed substantially perpendicular to axis of rotation of the body conducts the rotary and translatory vibrations to separate transducers. The slots essentially divide the plate into an outer frame and central portion, which are connected by narrow linking strips. The rotary vibrations are transmitted by linking strips which are stressed in bending, whereas the translatory vibrations are transmitted by linking strips which are stressed in tension or compression. Unwanted force factors are eliminated by interposing members between their source and the foundation, such as by mounting the rotating body and slotted plate upon springs, which in some instances may be vertically disposed.