Experts answer questions about retaining rings and wave springs
Every year, hundreds of technical questions are submitted through Smalley's "Ask the Expert" page. The company's team of engineering experts answers the questions directly, but they also post them in a blog for sharing. This selection addresses some commonly asked questions about retaining rings and wave springs. Very useful info.
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Lube nozzles oil the wheels of aviation gearboxes
Gearboxes used in aviation and other similar demanding applications are specially designed, held to tight tolerances, and require precise and reliable lubrication. This is in contrast to how gearboxes in heavier, more industrial applications tend to be immersed in lubricant without the need for targeted lubrication. The delivery of precise, highly accurate (and in some cases screened lubricants) is usually provided by lube nozzles. The Lee Company, with over 70 years of experience in precision fluid control, is able to offer special nozzle designs to meet most requirements. Safety screens can be added for additional protection.
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Tech Tip: Why use flame-resistant adhesives?
Learn about the benefits of flame-retardant adhesive and potting systems, including how they mitigate the risks associated with smoke, toxicity, and flames. Several Master Bond epoxies have been formulated to meet the stringent UL94V-0 specification and pass the horizontal/vertical burn test per FAR standard 14 CFR 25.853 (a). These products feature non-halogenated fillers, have low smoke emissions, and are self-extinguishing.
Protect internal threads during paint and powder coating processes
New PEM PreTect thread masking plugs from Penn-Engineering will protect internal threads of self-clinching nuts and standoffs during paint and powder coating processes. The pre-installed silicone masking plugs -- supplied already in place -- have been designed for self-clinching blind standoffs, thru-hole standoffs, and nuts in thread sizes #4-40 to 1/4-20 and M3 to M6. Plugs can be augmented for thru-hole fastener types with a specially engineered stretched polyester film offering thread protection on the side opposite the plug. Plugs and film can be removed easily using a fine tip tool when processes are completed.
New 3M tape tackles high-temp fastening applications
Since 1980, 3M VHB Tapes have opened the door to faster and easier assemblies. Now, the new GPH series from 3M combines the extreme, permanent bonding power and convenience of 3M VHB Tapes with high-temperature resistance. It can withstand operating temperatures up to 450 F, with long-term durability in conditions up to 300 F. Users will experience excellent adhesion to high and medium surface energy materials, as well as coated or painted surfaces. 3M VHB Tapes, including the new GPH series, replace traditional mechanical fasteners, subsequently eliminating processes like drilling, grinding, refinishing, screwing, welding, and associated rework/clean-up.
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Top Tech Tip: Balanced retaining rings
Smalley's balanced feature statically balances the retaining ring. A series of slots, opposite the gap end, account for the missing material in the gap. This characteristic is very useful when the balance of the assembly is critical and it is necessary to reduce eccentric loading.
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Belt conveyor design program
ABB's new web-based Dodge Passport design tool allows users to select, quote, and order conveyor pulley assemblies complete with shafting and mounted bearings for bulk material-handling applications. Real-time pricing and availability enable customers to make cost-effective selections of readily available components. After selections are complete, Passport's add-to-order capability lets customers seamlessly convert selections into orders via the PT Place e-commerce platform.
Updated grippers for plastic materials
FIPA has upgraded its proven product line of sprue grippers for handling plastic material. The Series 90, 100, and 130 grippers now bear the red FIPA dot, which makes the gripper components immediately identifiable in installations. The Series 90 grippers reliably grip small sprues due to their high closing force, wide jaw opening, and compact design, while the Series 100 grippers are designed to securely grip medium to large sprues. The Series 130 grippers feature strong gripping force and a wide jaw opening, making them ideal for large sprues. FIPA grippers have a long life cycle due to their high-strength aluminum alloy housing and jaws, with a durable, corrosion-resistant anodized coating. FIPA also offers grippers with and without "part present" monitoring.
Inserts for plastic assemblies provide reusable metal threads
SI inserts from Penn-Engineering permanently install in plastic assemblies to provide durable and reusable metal threads for mating hardware and allow for repeated disassembly and re-attachment whenever required. By promoting quick and easy access to an assembly, SI inserts offer highly practical joining solutions in contrast to fixed and unyielding methods, such as adhesives or rivets. Repeated reuse will not damage the strong metal threads or compromise attachment integrity. Types include brass inserts and lead-free stainless steel and aluminum versions.
New food-grade high-performance PEEK polymers
To help OEMs meet the stringent regulatory and quality demands affecting the food equipment industry, Victrex is introducing a dedicated PEEK food-grade portfolio. Compared to metal components, the new VICTREX FG family of high-performing thermoplastics offers additional benefits in terms of cost effectiveness, productivity, and performance for OEMs -- and the neutral taste expected by consumers. In addition, with the adoption of Industry 4.0 technology, VICTREX PEEK can offer food and beverage manufacturers the opportunity to optimize efficiency and reduce production costs, when compared to the use of metals.
Structural adhesive offers high-temperature stability
DELO MONOPOX HT2860 achieves up to three times the strength at a temperature of 150 C compared to previous product generations. Ideal for bonding magnets in electric motors used in cars, drilling, milling tools, washing machines, as well as in many other applications, this new adhesive has a glass transition temperature (Tg) of 168 C. It achieves a strength of 18 MPa on sand-blasted aluminum at 150 C. This is up to three times higher than standard epoxy resins. The versatile epoxy resin can be heat-cured in an oven for 40 minutes at 150 C or by induction.
How specialized coatings can make mechanical parts harder for extreme industrial applications
Although bearings, gears, rollers, and other precision components are generally made of hardened steel or metal alloys, those used in high-load applications still can fail due to excessive wear, surface fatigue, pitting, galling, and corrosion. To address this problem, product engineers and component manufacturers often turn to specialized PVD (physical vapor deposition) coatings that can further harden the surface of these parts. Oerlikon Balzers provides solid solutions.
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Stainless steel multiple-joint hinges
JW Winco now offers GN 7237 Stainless Steel Multiple-Joint Hinges with internal mounting brackets and a maximum opening angle of 180 deg. These multi-joint hinges are installed on the inside of flaps, hatches, or compartment doors to save space and ensure protection against vandalism. These hinges are generally used in pairs, meaning that one type L (left-hand) and one type R (right-hand) are used per opening. For higher loads, such as from large hatches, these can be supplemented with additional hinges of either type.
Automated formed-in-place gasket foam process
Formulated to conform to highly intricate metal and plastic components, Fermapor K31 from Sonderhoff USA (now part of Henkel AG & Co.) is a product line of two-component, crosslinking polyurethane formed-in-place (FIP) foam sealants designed to create a barrier gasket that effectively protects industrial assemblies from moisture, dust, dirt, liquids, and other contaminants. Fermapor K31 products offer dramatic cost and performance advantages over prefabricated, manually applied cut gaskets. The technology effectively seals electrical and electronic housings, lighting enclosures, appliances, automotive components, and other contaminant-sensitive consumer and industrial assemblies.
New carbon fiber material for SAAM additive systems from Cincinnati Inc.
Cincinnati Inc. (CI) has released a new carbon fiber resin material for its SAAM (Small Area Additive Manufacturing) fused filament fabrication 3D-printing system. The new material is impact resistant, lightweight, and has a very high strength-to-weight ratio. Carbon fiber reinforcement makes the material stiff, durable, and very low warping -- and advanced inter-layer adhesion results in accurate, quality parts with good dimensions. The material's superior surface finish makes it perfect for custom tooling applications, as well as assembly, CMM, welding, and CNC fixtures.
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Scientists predict a new superhard material with unique properties
Chemists from Russia and China have predicted a new superhard material that can be used in drilling, machine building, and other fields.
The new tungsten boride they discovered outperforms the widely used "pobedit," a hard tungsten carbide and cobalt composite material with artificial diamond interspersing. The results of their study were published June 2 in The Journal of Physical Chemistry Letters.
Superhard substances have a broad scope of application spanning well drilling, machine building, metalworking, defense industry, surgery, and many other fields. The hardest known material, diamond, is an unaffordable luxury in many applications. Its distant competitor, pobedit, has remained unrivaled for the last 80 years.
Developed in the 1930s, pobedit was used during World War II to make anti-tank shell caps (the word "pobedit" is actually derived from the Russian "pobeda," which means "victory") and has been used for decades to manufacture drill bits for drilling rigs. Harder materials either require higher pressure synthesis or have much lower fracture toughness.
A team of Skoltech (Moscow) scientists led by Professor Artem Oganov used their USPEX evolutionary algorithm to predict a new material, WB5, that can be synthesized at normal pressure and can successfully compete with pobedit in the two most essential parameters -- hardness and fracture toughness -- which are 50 percent higher and 20 percent lower, respectively, for WB5 as compared to pobedit. The new material is a previously unknown compound that can be easily obtained under normal conditions. The Skoltech scientists performed their study within the framework of Gazprom Neft's large-scale project aimed at creating new materials for drilling applications.
Schematic of the new material's structure. [Credit: Alexander G. Kvashnin et al., The Journal of Physical Chemistry Letters]
"Before we discovered the new material, we had studied a lot of systems on the computer, trying to predict stable chemical compounds and calculate their properties. These were quite interesting substances, although they could hardly compete with pobedit. At some point I thought we would never beat pobedit, which has stood its ground for almost a century -- and for good reason. But suddenly, we saw a glimmer of hope and soon found a unique compound, WB5," says the study lead, Artem Oganov.
"The tungsten-boron system has been the subject of a multitude of experimental and theoretical studies, and it is surprising that this compound has not been discovered until now," says the first author Dr. Alexander Kvashnin.
Source: Moscow Institute of Physics and Technology
Published August 2018
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