Mechanical & Fluid Systems

Electric Cylinder

SMAC (Carlsbad, CA) introduced the CBL50 electric cylinder designed to achieve peak force of 50N at 2 Amp current, and acceleration up to 40G. It features carriage-free design and built-in linear bearings. It is available with a vacuum and spring option for pick-and-place applications. With the optional IP65 and IP67 dustproof and waterproof feature, the cylinder is suited for applications such as food and beverage processing, packaging, and pharmaceutical industries. Stroke lengths of 10, 25, 50, and 100 mm will be available. The cylinder is offered with a choice of encoder resolutions, with 5-micron standard, and 1 and 0.1 micron optional. It is fully programmable in position, velocity, and force simultaneously. A patented “Soft-land” function ensures precise contact force.

For Free Info Visit http://info.hotims.com/55588-305

Posted in: Products, Manufacturing & Prototyping, Mechanical Components, Motion Control
Read More >>

Stages

Optimal Engineering Systems (Van Nuys, CA) released low-profile XYθ (theta) stages that move in an XY-plane and rotate around the center of the XY-plane. Available in 12 models in two precision grades, the stages have linear travels from ±2 by ±2 mm, up to ±30 by ±30 mm. The stages can rotate around the center of the XY plane up to ±6°. Four models have solid tables sized from 100 x 100 mm to 200 x 200 mm, and eight stages from 250 x 250 mm to 1500 x 1500 mm are hollow core (open frame) stages. Available in normal and precision grades, they have preloaded cross roller bearings, and typical normal repeated positioning accuracy is from ±1.75 μm to ±2.5 μm; typical precision repeated positioning accuracy is from ±0.7 μm to ±1.0 μm.

Parallelism of the stages is as low as 30 μm, and the larger stages can handle dynamic loads to 600 kg. The stages can be ordered with linear encoders for closed loop operation, customized to meet specific requirements, and complete ready-to-run alignment systems.

For Free Info Visit http://info.hotims.com/55588-306

Posted in: Products, Manufacturing & Prototyping, Mechanical Components, Motion Control
Read More >>

Coupling

C-Flex Bearing Co. (Frankfort, NY) offers a Super Plastic torsional damping coupling that stabilizes high-precision systems by dampening transient torque variations. The patented design offers high-torque loads with zero backlash for positioning in industries such as medical, packaging, and semiconductor. The standard flexible coupling is made up of two high-strength aluminum ends with glass-impregnated polyamide flexures. They are available with both set screws and “No Mark” steel clamp bushings. English and metric versions are available. Bore sizes range from 0.125" to 1.25", and 4 mm to 32 mm. Lattice and servo styles are available in both the Super Plastic and all stainless steel versions.

For Free Info Visit http://info.hotims.com/55588-310

Posted in: Products, Manufacturing & Prototyping, Joining & Assembly, Medical, Motion Control, Packaging, Semiconductors & ICs
Read More >>

Design for Improving the Flatness of Solar Sails

An optically flat solar sail could be useful in optical communication and solar energy applications.

NASA’s Jet Propulsion Laboratory, Pasadena, California

This work describes a discontinuous or segmented mirror whose overall flatness is less dependent on the limited tension that can be supplied by the booms. A solar sail is a large, nominally flat sheet of extremely thin reflectorized film rigidly attached to a spacecraft, enabling propulsion via solar radiation pressure. Rip-stop fibers embedded in the backside of the film — with diameters ≈100× the thickness of the film — are commonly used to arrest tear propagation, which can easily occur in the handling and/or deployment of these gossamer-thin structures. Typically, the thin film or membrane that is the sail is systematically folded to enable both volumetrically compact transportation to space and mechanized deployment. It is the aggressive folding and creasing of the thin film that limits the ultimate flatness that can be achieved.

Posted in: Briefs, TSP, Communications, Energy, Solar Power, Mechanical Components, Solar energy, Spacecraft
Read More >>

Reactionless Drive Tube Sampling Device and Deployment Method

Springs and a counter-mass create a powerful and stable sampling device.

NASA’s Jet Propulsion Laboratory, Pasadena, California

A sampling device and a deployment method were developed that allow collection of a predefined sample volume from up to a predefined depth, precise sampling site selection, and low impact on the deploying spacecraft. This device is accelerated toward the sampled body, penetrates the surface, closes a door mechanism to retain the sample, and ejects a sampling tube with the sample inside. At the same time the drive tube is accelerated, a sacrificial reaction mass can be accelerated in the opposite direction and released in space to minimize the momentum impact on the spacecraft. The energy required to accelerate both objects is sourced locally, and can be a spring, cold gas, electric, or pyrotechnic. After the sample tube is ejected or extracted from the drive tube, it can be presented for analysis or placed in a sample return capsule.

Posted in: Briefs, TSP, Mechanical Components, Motors & Drives, Drilling, Test equipment and instrumentation, Spacecraft
Read More >>

Nozzle Heat Flux Gauge

Marshall Space Flight Center, Alabama

This innovation is a tungsten-rhenium gauge that can be placed into an aft exit cone of a rocket motor. It will measure heat flux with time for the full duration of the RSRM (reusable solid rocket motor) nozzle environment with equal response time.

Posted in: Briefs, Mechanical Components, Measuring Instruments, Nozzles, Rocket engines, Thermal testing
Read More >>

Rotary-Hammer Core Sample Acquisition Tool

This tool can be used for drilling in construction, mining, or scientific research applications.

NASA’s Jet Propulsion Laboratory, Pasadena, California

NASA is developing technologies to enable in situ analysis and sample acquisition from planetary bodies. Missions to these diverse locations require autonomous, highly customizable, reliable tools. A tool capable of core generation, capture, and transfer, and customizable for different missions, would be very valuable.

Posted in: Briefs, TSP, Data Acquisition, Mechanical Components, Tools and equipment, Drilling, Test equipment and instrumentation
Read More >>

Robust Gimbal System for Small-Payload Manipulation

This is a low-mass, small-volume gimbal unit.

NASA’s Jet Propulsion Laboratory, Pasadena, California

Spaceborne gimbal systems are typically bulky with large footprints. Such a gimbal system may consist of a forked elevation stage rotating on top of the azimuth motor, and occupy a large volume. Mounting flexibility of such a system may be limited.

Posted in: Articles, Briefs, TSP, Mechanical Components, Motion Control, Motors & Drives, Materials handling, Mountings, Spacecraft
Read More >>

Cooling Test Samples With a Combined Convective and Conductive System to Rapidly Reach 77 K

This innovation enables rapid cooling to 77 K of James Webb Space Telescope shields, which enables hypervelocity impact testing with micro-particle spheres.

Lyndon B. Johnson Space Center, Houston, Texas

In this innovation, a team successfully developed and implemented a combined convective and conductive cooling system that permits rapid cooling. Using a spray system, liquid nitrogen (LN2) was injected into a test article enclosure located in the target tank that was evacuated to a lower pressure than the surrounding ambient pressure of the White Sands Test Facility (WSTF). According to the saturation curve for nitrogen, temperatures lower than 77 K can be achieved by using the evaporative process as long as the pressure remains above the triple point where nitrogen ice is formed.

Posted in: Articles, Briefs, TSP, Mechanical Components, Mechanics, Test & Measurement, Containers, Cooling, Spraying, Test equipment and instrumentation
Read More >>

Variable-Sweep-Wing Aircraft Configuration

There are significant improvements in structural, aerodynamic, and energy efficiency.

Ames Research Center, Moffett Field, California

Efficient aircraft designs are increasingly desired in order to support the continued growth of the air transportation industry. Continued expansion of this vital mode of transportation is threatened due to concerns over ever-increasing emissions, noise, and the demand for fuel. Current airport runway, ramp, and terminal facilities are increasingly constrained by encroaching growth and neighborhood environmental issues. The challenges associated with ever-increasing demand for air travel will require the development of aircraft that can fly efficiently over wide speed ranges, minimize their environmental impacts, offer the potential for sizing and growth relative to market demand, and make efficient use of constrained airport and airspace resources.

Posted in: Articles, Briefs, Aeronautics, Aerospace, Aviation, Energy Efficiency, Manufacturing & Prototyping, Mechanical Components, Fuselages, Wings, Product development, Aircraft
Read More >>

The U.S. Government does not endorse any commercial product, process, or activity identified on this web site.