August 20, 2019 Volume 15 Issue 31

Mechanical News & Products

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Build-to-order knobs and hand hardware

Rogan Corp.'s innovative use of two-shot plastic injection and insert molding has been providing customers with high-quality plastic clamping knobs, levers, and control knobs for almost 90 years. Rogan offers concurrent engineering, product design, and assistance in material selection to ensure customer satisfaction for standard or customized parts, with a focus on cost optimization and on-time delivery. Custom colors, markings, decorative inlays, or engineered materials to meet special requirements, such as adding extra strength or utilizing flame-retardant material, are all offered.
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Slewing ring bearing made of wood and plastic

The PRT-02-30-WPC slewing ring bearing is another step forward by igus toward integrating renewable raw materials into industrial production. Made of 50% wood and 50% high-performance plastics, the cost-effective and lubrication-free slewing ring bearing balances strength and durability with a proven low CO2 footprint. The materials incorporate solid lubricants, making the new slewing ring bearing smooth running and maintenance-free.
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Flex Locators for quick fixture changeover

Flex Locators from Fixtureworks are designed for quick changeover of small and large fixtures, automation components, and more. They are ideal for applications that require frequent disassembly, providing excellent repeatability for locating and clamping in a single operation. Manual and pneumatic versions are available. Just turn the handle, knob, or screw!
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Copper foam -- so many advantages

Copper foam from Goodfellow combines the outstanding thermal conductivity of copper with the structural benefits of a metal foam. These features are of particular interest to design engineers working in the fields of medical products and devices, defense systems and manned flight, power generation, and the manufacture of semiconductor devices. This product has a true skeletal structure with no voids, inclusions, or entrapments. A perennial favorite of Designfax readers.
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New torque inserts provide design flexibility

Reell's TI-330 torque insert completes the gap in torque range between the TI-320 and TI-340 models in the TI-300 series, providing enhanced design flexibility for a wider range of applications. With torque options ranging from 1.0 to 2.5 Nm, the TI-330 features a powdered metal package configuration designed to be press-fit into round holes for quick and easy installation. Mounting profile options include exposed knurled shaft end and a knurled zinc adapter for installation into plastics.
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Superior fastening solution for securing rotating components to a shaft

SDP/SI Shaftloc® fasteners offer distinct advantages over other fastening methods when securing rotating components to a shaft. The key to this compact, efficient design is its asymmetric thread geometry that produces a greater clamping force -- outperforming other fastening methods. Shaftloc is a patented fastening system manufactured by SDP/SI.
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Great design: Handle with integrated lighting/signaling

Signaling and indicator lights, switches, and buttons -- elements that hardly any machine can do without. The new JW Winco cabinet U-handle EN 6284 integrates all these functions into a single, compact element. The new U-handle is designed to enhance the operation of systems and machines. It features an integrated button and a large, colored, backlit area on the back of the handle. These elements can be used individually or in combination, providing a versatile tool for system control and process monitoring that can be seen from across the room.
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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.
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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.

Sometimes science is a blast: Researchers build cannon to test seals in coal mines

Missouri S&T associate professor of explosives engineering, Dr. Kyle Perry, monitors students Frank Schott (middle) and Ethan Steward (right) loading a cannon with projectiles to test concrete coal mine seals. [Photo by Tom Wagner/Missouri S&T, 2019 Missouri S&T]





Mining and explosives engineering researchers at Missouri University of Science and Technology (Missouri S&T) began testing concrete seals used to close coal mine tunnels this month by loading a cannon with projectiles, shooting them at the seals, and testing their impact. The research could help to improve the design of seals and keep miners safe.

Dr. Kyle Perry, Missouri S&T associate professor of mining and nuclear engineering, is the lead researcher on the project. Working with him is Ethan Steward, a master's student in explosives engineering from Chelsea, South Dakota. Steward and Perry spent about five months building the 8-ft cannon they're using in the study.

"We started loading the cannon with light things that a miner might leave behind such as a hard hat, water jug, and hand tools," says Perry. "The hard hat and jug didn't do anything to the seals, but the hand tools took a good chunk out of the concrete, and the roof plates put pretty good gouges into the seal."

The researchers use three different cameras to document what happens as the cannon fires the projectiles at the seals. They then slow down the videos to study them. They have a regular camcorder and two Go-Pros that can get closer to the blast because of their small size. Strain gauges on the seals also tell them what the seal experiences during each blast.

"The videos help us tell what objects are impacting first," says Perry. "We can start relating the projectile to the strain the seal is experiencing. There's a lot going on and there's smoke, which makes it hard to see sometimes."

Steward says the seals are rated to withstand certain pressure levels, and designers know what pressure they can handle underground. But he says the seals have never been tested before for projectile impact. They hope to learn how the concrete seals withstand blasts from objects left behind in tunnels such as equipment, hard hats, chunks of steel, and tools.

"What we don't know for sure is if these projectiles can damage the seals enough to make them fail for the pressure they are rated for," says Steward. The research should tell seal designers if they need to adjust their designs to strengthen seals to withstand impacts.

Missouri S&T researchers are using several video cameras to document the cannon firing at the concrete seals. [Photo by Tom Wagner/Missouri S&T, 2019 Missouri S&T]





Strata Worldwide, a mining safety services provider based in Atlanta, built two concrete seals for project testing -- one a 120-psi (pounds per square inch) design and one a 50-psi design.

Perry says if an explosion happens in a sealed-off area of a mine, the seals need to withstand the pressure and any projectiles that hit it without serious damage because there's a chance of a second explosion.

"If another explosion makes the seal fail, that could put the miners in jeopardy," says Perry. "I'm more worried about hitting the seal so hard that it fractures and cracks."

Perry says a fractured seal could leak methane from the sealed areas and create a potentially explosive environment for miners in active mining zones. The researchers hope to determine the size and speed a projectile would need to travel to damage the seal.

S&T received a $249,000 grant from the Alpha Foundation for the Improvement of Mine Safety and Health, an organization formed as a result of one of the worst mining disasters in U.S. history -- the one that killed 29 miners at the West Virginia Upper Big Branch Mine in 2010. The S&T Experimental Mine was chosen because of its large-scale testing facilities and expertise.

The testing should be complete by the end of the year, and the research will conclude by April 2020.

Source: Missouri University of Science and Technology

Published August 2019

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