May 23, 2017 Volume 13 Issue 20

Mechanical News & Products

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SOLIDWORKS: FeatureManager tips for assemblies

Discover tools to make your SOLIDWORKS assembly Feature-Manager design tree display easier to view and use. Learn options to limit the amount of information in each component listing, combine multiple instances of a component into a single listing, and separate fasteners mates into a new folder. Lots more tips on the SOLIDWORKS YouTube channel.
View the video.


Top die casting design tips: Xometry

Optimize your die casting project's manufac-turability with these 23 top design tips from Xometry. Ensure your work is cost effective too, so you can hit the ground running and have the highest chance of success. Tips include: fillets and radii, wall thicknesses, ribs and metal savers, holes and windows, parting lines, finishes, and more.
Read the Xometry article.


8 top ways to wreck your coupling-driven system

Engineers at Ruland Manufacturing Co. have compiled the eight best ways to consistently sabotage or damage your coupling-driven system -- and how to avoid these pitfalls in the future. Misunderstanding performance criteria such as misalignment, torque, or rpm can be all it takes to cause a critical and costly failure.
Read the full article.


New washer tech for leak-free automotive sealing

Trelleborg Sealing Solutions has just launched the Rubore® Washer, a unique solution offering virtually leak-free sealing beneath screwheads to safeguard critical systems in vehicles, especially electric ones.
Read the full article.


How Reell electric wrap spring clutches work

Electric wrap spring clutches are ideally suited for critical timing applications requiring consistent, repeatable engagement and disengagement performance. Wrap spring technology used in Reell clutches provides the capability to transmit a large amount of torque in a small size -- package sizes smaller than other clutch technologies such as friction disk, tooth, or magnetic particle. Reell's technology has very positive engagement characteristics and also limits the effects of wear.
Read this informative Reell article.


New 'breathable' rupture disk tech provides overpressure and vacuum relief

To increase equipment safety and reliability, a new rupture disk technology activates at a set burst pressure, but it can also "breathe" to relieve minor pressure fluctuations. The patent-pending, dual-function device from BS&B Safety Systems is ideal for use on low-pressure vessels that are susceptible to ambient temperature changes.
Read the full article.


Engineer's Toolbox: 9 considerations for specifying a slewing ring bearing

In applications that require a bearing to support a structure while it rotates (e.g., cranes, radar, tank turrets), premature bearing failure can put people and equipment at risk. While slewing ring bearings have proven themselves countless times in such applications, designers must consider many factors when specifying them. According to engineers at Kaydon, the bearing's support structure, mounting (including bolt strength, tensioning, and hole patterns), installation, and even storage are all factors in a bearing's success or failure.
Read the full article.


ClampDisk micro fastener is new alternative for automotive and consumer electronics

Designed as a unique alternative in assemblies for the automotive and consumer electronics markets, the ClampDisk Press-on Fastener is a new offering from PennEngineering that delivers a fast, simple way to achieve sheet-to-sheet clamped fastening while replacing the use of standard screws, nuts, and adhesives. The most common challenges that can be eliminated or reduced by using ClampDisk include over installation, cross threading, stripped screw heads, broken screws, and damaged product. This fastener can be removed easily with a sharp-edged tool.
Learn more and see how ClampDisk works.


New nylon constant torque hinge

Southco has expanded its line of E6 Constant Torque Hinges with a compact, nylon version designed for small applications. The newest addition to the company's E6 50 Constant Torque Position Control Hinge series measures 45 mm with a torque range of 4 to 16 in./lb and is 65% lighter compared to the standard E6 50 Hinge. It provides constant resistance throughout the entire range of motion, enabling users to easily position doors, display screens, and other mounted components and hold them securely at any desired angle.
Learn more.


What injection molding material do I use?

How do you decide what type of plastic to use for your next injection molding project? Xometry can help you narrow your choices. Discover the different strengths and applications for materials that could be ideal for your application by learning about the most common plastic injection molding materials in detail.
Read this detailed Xometry article.


What are carbon composite bellows springs?

The Carbon Composite Bellows Spring (CCBS) from MW Components is a system of carbon fiber elements that combine to work as a high-performance, lightweight, and design-flexible compression spring meant to replace coil springs or metallic Belleville disc springs. A functional spring is made from several individual elements paired and joined to make a stack. The stack spring rate is determined by the number of elements, the base rate of each element, and their series or parallel orientation in the stack. Applications include motorsports, aerospace, and high-performance activities.
Learn more.


Conductive Brush Ring overcomes current leakage in EV powertrains

SKF's new Conductive Brush Ring paves the way to greater reliability and longer life in high-performance electric vehicle powertrain systems. Using pure carbon fiber bristles, it provides a reliable electrical connection between an EV eAxle rotor shaft and its housing. When used in combination with SKF Hybrid ceramic ball bearings, it helps to alleviate parasitic current effects that can lead to premature failure in bearings and other components. Available in different configurations for wet (oil-lubricated) motor designs -- and soon for dry (sealed) applications.
Learn more.


hyperMILL 2024 CAD/CAM software suite

OPEN MIND Technologies has introduced its latest hyperMILL 2024 CAD/CAM software suite, which includes a range of powerful enhancements to its core toolpath capabilities, as well as new functionality for increased NC programming efficiency in applications ranging from 2.5D machining to 5-axis milling. New and enhanced capabilities include: Optimized Deep Hole Drilling, a new algorithm for 3- and 5-axis Rest Machining, an enhanced path layout for the 3D Plane Machining cycle, better error detection, and much more.
Learn more.


One-part epoxy changes from red to clear under UV

Master Bond UV15RCL is a low-viscosity, cationic-type UV-curing system with a special color-changing feature. The red material changes to clear once exposed to UV light, indicating that there is UV light access across the adhesive material. Although this change in color from red to clear does not indicate a full cure, it does confirm that the UV light has reached the polymer. This epoxy is an excellent electrical insulator. UV15RCL adheres well to metals, glass, ceramics, and many plastics, including acrylics and polycarbonates.
Learn more.


SPIROL Press-N-Lok™ Pin for plastic housings

The Press-N-Lok™ Pin was designed to permanently retain two plastic components to each other. As the pin is inserted, the plastic backfills into the area around the two opposing barbs, resulting in maximum retention. Assembly time is quicker, and it requires lower assembly equipment costs compared to screws and adhesives -- just Press-N-Lok™!
Learn more about the new Press-N-Lok™ Pin.


New 3D-printing method for silicone promises vastly superior medical implants for millions

[Photo: Christopher O'Bryan]

 

 

For the millions of people every year who have or need medical devices implanted, a new advancement in 3D-printing technology developed at the University of Florida promises significantly quicker implantation of devices that are stronger, less expensive, more flexible, and more comfortable than anything currently available.

In a paper published May 10 in the journal Science Advances, researchers lay out the process they developed for using 3D printing and soft silicone to manufacture items that millions of patients use: ports for draining bodily fluids, implantable bands, balloons, soft catheters, slings, and meshes.


VIDEO: Silicone is 3D printed into the micro-organogel support material. The printing nozzle follows a predefined trajectory, depositing liquid silicone in its wake. The liquid silicone is supported by the micro-organgel material during this printing process.

Currently, such devices are molded, which could take days or weeks to create customized parts designed to fit an individual patient. The 3D-printing method cuts that time to hours, potentially saving lives. What's more, extremely small and complex devices, such as drainage tubes containing pressure-sensitive valves, simply cannot be molded in one step.

With the UF team's new method, however, they can be printed.

"Our new material provides support for the liquid silicone as it is 3D printing, allowing us create very complex structures and even encapsulated parts out of silicone elastomer," said lead author Christopher O'Bryan, a mechanical and aerospace engineering doctoral student in UF's Herbert Wertheim College of Engineering and lead author on the paper.

It also could pave the way for new therapeutic devices that encapsulate and control the release of drugs or small molecules for guiding tissue regeneration or assisting diseased organs such as the pancreas or prostate.

The cost savings could be significant as well.

"The public is more sensitive to the high costs of medical care than ever before. Almost monthly we see major media and public outcry against high health care costs, wasteful spending in hospitals, exorbitant pharmaceutical costs," said team member Tommy Angelini, an associate professor of mechanical and aerospace. "Everybody agrees on the need to reduce costs in medicine."

The new method was born out of a project Angelini and his team have been working on for several years: printable organs and tissues. To that end, the team made a significant discovery two years ago when it created a revolutionary way to manufacture soft materials using 3D printing and microscopic hydrogel particles as a medium.

The problem was, the previous granular gel materials were water-based, so they were incompatible with oily "inks" like silicone. It was literally a case of trying to mix oil and water.

To solve that problem, the team came up with an oily version of the microgels.

"Once we started printing oily silicone inks into the oily microgel materials, the printed parts held their shapes," Angelini said. "We were able to achieve really excellent 3D-printed silicone parts -- the best I've seen."


VIDEO: Water is pumped from one reservoir to another using a 3D-printed silicone valve. The silicone valve contains two encapsulated ball valves that allow water to be pumped through the valve by squeezing the lower chamber. The silicone valve demonstrates the ability of the new 3D-printing method to create multiple encapsulated components in a single part -- something that cannot be done with a traditional 3D-printing approach.

Manufacturing organs and tissues remains a primary goal, but one that is likely many years away from reality.

Not so with the medical implants.

"The reality is that we are probably decades away from the widespread implanting of 3D-printed tissues and organs into patients," Angelini said. "By contrast, inanimate medical devices are already in widespread use for implantation. Unlike the long wait we have ahead of us for other 3D-bioprinting technologies to be developed, silicone devices can be put into widespread use without technologically limited delay."

Other members of the UF team are Tapomoy Bhattacharjee, Samuel Hart, Christopher P. Kabb, Kyle D. Schulze, Indrasena Chilakala, Brent S. Sumerlin, and Greg Sawyer.

Source: University of Florida

Published May 2017

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