Motion Control

Magnetic Relief Valve

A side view of the relief valve sections (left), and a view inside the relief valve (right). A magnetically retained pressure-relief valve enables quick-open on/off operation when overpressure is reached.Inventors at NASA’s Kennedy Space Center have developed a magnetically retained, fast-response pressure relief valve that is designed to fully open at precise cracking pressures, and that operates in a fully open/fully closed manner. The use of a magnetically controlled relief valve, as opposed to a spring-based relief valve, enables quick-open on/off relief operation when overpressure is reached. This is due to the rapid decay of the magnetic field as the fluid medium pushes the valve poppet to an open position. Spring-based relief valves require increasing pressure and force to continually compress the spring and open the relief valve. This requirement greatly complicates the design of a system relief mechanism. A magnetic relief valve reduces these design complexities by eliminating the spring.

Posted in: Briefs, Mechanical Components, Mechanics, Fluid Handling

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Work Piece Cleaning Apparatus and Method with Pulsating Mixture of Liquid and Gas

NASA Goddard’s scientists have developed a novel, volatile organic compound (VOC)-free system for cleaning tubing and piping that significantly reduces cost and carbon consumption. The innovative technology enables the use of deionized water in place of costlier isopropyl alcohol (IPA), and does not create any waste for which costly disposal is usually required. It uses nitrogen bubbles in water, which act as a scrubbing agent to clean equipment. The cleaning system quickly and precisely removes all foreign matter from tubing and piping.

Posted in: Briefs, Mechanical Components, Mechanics, Fluid Handling

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Safety Drain System for Fluid Reservoir

Researchers at NASA’s Marshall Space Flight Center have developed a system that reduces the entrapment risks associated with a pool or spa’s recirculation drain. The technology prevents hazards caused by suction forces on the body, hair, clothing, or other articles. Employing a novel configuration of drainage openings along with parallel paths for water flow, the system redistributes force over a much larger area, minimizing suction force at any localized area. With more efficient drainage and recirculation, the device improves performance, increases safety, and decreases operating costs. The technology can also provide thorough chemical mixing, which improves processes in systems and allows continued operation in the event of localized debris clogging a portion of the recirculation area. All of these benefits come without a protrusive drain cover, leaving the area safe and aesthetically pleasing.

Posted in: Briefs, Mechanical Components, Mechanics, Fluid Handling

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Temperature-Compensating PMT Housing

Shrinking or contracting light guides is a problem when photomultiplier tubes (PMTs) are glued to the guides. If there is no way to allow movement of the PMTs, when the temperature goes down, the light guide contracts and breaks the glue joint. The PMTs cannot be left loose to rattle around inside the detector. They must be held precisely, yet gently, and allowed to move.

Posted in: Briefs, Mechanical Components, Mechanics, Fluid Handling

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Electro-Hydraulic Motion Controller

Delta Computer Systems (Battle Ground, WA) has announced the RMC200 closed-loop electro-hydraulic motion controller that has the capacity to handle closed-loop control of up to 32 motion axes. The controller can synchronize the motion of multiple axes, enabling the construction of machines with scalable performance and quick production changeovers. It provides built-in support for controlling pressure/ force as well as position/velocity/acceleration. Through use of a programmable feature key, the controller will enable only the number of control loops that a customer’s application needs. Other features include a display screen on the CPU, I/O modules with push-in wire connectors, and fully encased, user-installable modules that “rock-in” to provide power-sequencing capability. The unit’s modular expandability enables it to support expanded control and I/O interfacing compatibility as new modules are developed.

Posted in: Products, Manufacturing & Prototyping, Motion Control

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Grippers

Airpot® Corp. (Norwalk, CT) announced GramForce™ Accurate Force Pneumatic grippers that generate no measurable friction and provide a gentle grip for delicate operations. They operate at pressures from 0.02 MPa to 0.7 MPa, and offer holding pressures as low as 0.25 N (0.056 pounds) and up to 8.6 N (1.9 pounds). With synchronous and counterbalanced parallel design that allows unchanging gripping force in any mounting orientation, the grippers are internally driven by two 5.6-mm-bore pneumatic actuators. The carriage blocks are mounted on a stainless steel rail. They have operating ranges from -20 to 80 °C. The design accommodates finger lengths up to 75 mm. Assembled, the gripper is less than 50 mm high, less than 79 mm long, and 26 mm wide. The grippers are suited for precision assembly equipment, test and measurement devices, robotic end-effectors, small parts handling, and machining operations.

Posted in: Products, Manufacturing & Prototyping, Motion Control

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Servo Drives

Advanced Motion Controls® (Camarillo, CA) announced AxCent™ servo drives for centralized motion control schemes. The Models AB15A100, AB25A100, and AB20A200 are panel-mount servo drives that operate with brushless permanent magnet motors as well as brushed motors and inductive loads. The drives are controlled with ±10V analog command signals, and use trapezoidal commutation when driving brushless motors. The AB15A100 outputs 15A peak and 7.5A continuous with up to an 80VDC bus; the AB25A100 outputs 25A peak and 12.5A continuous with up to an 80VDC bus; and the AB20A200 outputs 20A peak and 10A continuous with up to a 175VDC bus.

Posted in: Products, Manufacturing & Prototyping, Motors & Drives

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