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Rittal Hosts President Obama at Germany’s Hannover Fair

"We want to build on the spirit of innovation in the USA," said President Barack Obama in his opening speech at the Hannover Messe trade fair in Germany. Following the official opening, President Obama, accompanied by German Chancellor Angela Merkel, was given a tour of the Rittal Corporation booth. Rittal is the world’s largest enclosure manufacturer and a leader in thermal management of electrical, electronic, and IT equipment.

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Selecting the Right Material for 3D Printing

This industrial 3D printing white paper explores the properties of thermoplastic and metal materials available with direct metal laser sintering, selective laser sintering and stereolithography technologies. It also includes a quick-reference guide of material attributes that can steer you toward the proper grade. Download your free copy today!

Posted in: White Papers, Electronics

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From The Design Lab: An Insider’s Guide To Laser Sintering

While all additive manufacturing (AM) processes share the ability to create multifaceted parts with intricate features, each system has its own design guidelines to ensure accuracy and optimize part design for the build process and compatible materials. These design guidelines and trade knowledge are usually not shared externally, which can leave the average design engineer feeling adrift on a sea of 3D printing challenges. However, through years of experience, Stratasys Direct Manufacturing has gathered the most efficient design guidelines for one of the more popular 3D printing technologies: Laser Sintering. This article details a study undertaken by Stratasys Direct Manufacturing and the University of Texas (UT) at Austin which vetted tolerances for challenging LS design features such as minimum wall thickness, optimal build orientation for small to large features, and feature distances and areas in relation to part walls. Our goal is to make the information collected within the study well-known to the average design engineer and present working expectations for what LS can do, and therefore minimize errors and achieve consistently successful LS parts.

Posted in: White Papers

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Method to Improve the Synthesis Process of High-Purity Bulk Multi-Element Compounds

Marshall Space Flight Center, Alabama Multi-element compounds have been used ubiquitously in various applications, including electronics, optics, opto-electronics, thermoelectrics, superconductivity, and the recently developed application of spintronics. Besides being the main components of some of these devices, the bulk form of these compounds is needed as a standard for fundamental property characterizations as well as the starting materials for thin-film deposition. Hence, the chemical purity and crystalline quality of these bulk compounds are critical for the applications.

Posted in: Briefs

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Laser Subdivision of the Genesis Concentrator Target Sample 60000

Lyndon B. Johnson Space Center, Houston, Texas A need arose for approximately 1 cm2 of a diamond-like-carbon (DLC) concentrator target for the analysis of solar wind nitrogen isotopes. The original target was a circular quadrant with a radius of 3.1 cm; however, the piece did not survive intact when the spacecraft suffered an anomalous landing upon returning to Earth. An estimated 75% of the DLC target was recovered in at least 18 fragments. The largest fragment, Genesis sample 60000, was designated for this allocation, and is the first sample to be subdivided using a laser scribing system. Laser subdivision has associated risks, including thermal diffusion of the implant if heating occurs, and unintended breakage during cleavage. In order to minimize the possibility of unintended breakage of the actual target wafer during subdivision, a careful detailed study involving numerous laser scribing plans was undertaken. The innovation described here involves the results of this study that yielded a cutting plan essentially guaranteeing ~100% cleaving success of this precious space-exposed wafer.

Posted in: Briefs

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Fabrication of an Integrated Photonic Waveguide Joint in Micromachined Silicon

This technology could be used in any MEMS or micromachined structure that requires multiple levels of topography. Goddard Space Flight Center, Greenbelt, Maryland High-aspect-ratio silicon structures are necessary components in many MEMS (microelectromechanical systems). Aspect ratio is defined as the ratio of the height of the structure to its lateral width. The structures are typically fabricated through bulk micromachining steps such as deep reactive ion etching. In some cases, multiple levels of high-aspect-ratio structures are required. For instance, one may want to etch completely through a silicon wafer to thermally isolate a bolometer or provide waveguide coupling to an antenna defined on an insulating membrane, and at the same time have integrated high-topology structures required for microwave coupling or filtering. Definition of the structures typically uses photolithographic technology. But for high-aspect-ratio structures, spin cast resist becomes difficult to incorporate due to the non-uniform thickness of the resist around tall structures. One can cast very thick layers of photoresist, but this limits the minimum feature size, and additionally, very thick layers of photoresist are difficult to work with due to solvent release and moisture that can cause the resist to crack or swell. For electromagnetic reasons, the structures would preferably be made from conductive material such as metal or degeneratively doped silicon. The objective of this work was to incorporate multiple levels of conductive high-aspectratio structures with standard micromachining processes.

Posted in: Briefs

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Very Large Inflatable Antenna Structures

This methodology enables production of very large, but lightweight, structures in space. Langley Research Center, Hampton, Virginia Future space exploration past Earth orbit has a significant need for manufacturing in space beyond simple assembly of prefabricated parts. The next generation of very large aperture antennas will exceed the size achievable with conventional folding mesh technologies and new concepts are needed to support football-field-size structures. Technologies to address the problem have been developed using the formation of polyurethanes in a vacuum environment. Large inflatable structures can be stabilized by the formation of polyurethane foams of controlled density. For use in a vacuum environment, the availability of oligomeric precursors is important. Low-molecular-weight components would immediately evaporate, changing the stoichiometry of the reaction and potentially contaminate a space environment, but high-molecular-weight precursors have a much more limited range of properties.

Posted in: Briefs

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