July 20, 2021 Volume 17 Issue 27

Mechanical News & Products

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New adhesive for aerospace manufacturers

AeroPaste is Solvay's new generation of epoxy-based structural paste adhesives that provide film-like property and performance, comparable or superior to leading film adhesives on the market. AeroPaste 1006, 1009, and 1100 are now available commercially. These products are suitable for both metal and composite bonding or repair in a variety of application requirements and are designed specifically to enable rapid assembly and automation. AeroPaste is aimed at increasing manufacturers' efficiency and output by enabling fast and easy application, and offering excellent tolerance to variations in bondline thickness.
Learn more.


Handle basic misalignments starting at 10 bucks

Automation-Direct has added SIM drive couplings to their line of mechanical power transmission products. SIM drive couplings are power transmission components used to couple the shafts of various mechanical devices, often of different sizes, and compensate for shaft misalignment. Four different styles of couplings are available: Jaw/Spider couplings provide a wide range of fitment and higher torque, Oldham couplings provide a higher speed rating and allow for a higher misalignment of mated shafts, servo beam-style couplings add a significant increase to speed rating and have zero backlash, while high-gain couplings offer the highest speed ratings, excellent vibration absorption, and zero backlash.
Learn more.


Round vs. square rails -- which are better for you?

Thomson invented the world's first anti-friction linear ball bushing bearings in 1946. For many years, these round-rail linear guides satisfied every linear motion control requirement. However, as machines required closer tolerances, the round rail didn't always fit the bill. Learn the pros and cons of each design type.
Read this informative Thomson blog.


New bearings reduce wear in heavy-duty applications

igus has introduced a new bearing with an improved iglide material, called TX2, that offers self-lubricating and maintenance-free properties for heavy-duty applications. TX2 increases wear resistance by a factor of 3.5 in load ranges with more than 100-MPa surface pressure. The material is ideal for components in machines that serve construction and agriculture, which can require more than 50 liters of lubricant annually. The material is also very resistant to temperature, chemicals, moisture, corrosion, and seawater, which opens up the applications base for its use substantially.
Learn more.


Aerospace fastener hole drilling and countersinking all in one step

Kennametal has introduced the HiPACS drilling and countersinking system for aerospace fastener holes. Designed to drill and chamfer holes in one operation, the high-precision tool meets the aerospace industry's stringent accuracy requirements while delivering increased tool life in machining composite, titanium, and aluminum aircraft skins. With an industry-standard interface, HiPACS can be utilized on any CNC machine. Three components eliminate the need for custom tooling: a reducer sleeve with a built-in high-precision pocket seat, a PCD countersinking insert, and two series of solid carbide drills.
Learn more.


Why precision metrology is critical for electric vehicle gearing

As the shift from internal combustion engines to electric motors in vehicles continues, the number of drivetrain components will dramatically lessen too. The remaining components will be even more critical to a vehicle's operation and longevity. One such area is the gear components necessary to convert the high-force torque from electric motors to the RPMs at the wheel.
By Michael Schmidt, Zygo Corporation
Read the full article.


Master CNC machining tolerances eBook

Need a refresher on the basics of applying tolerances to custom machined metal and plastic parts? In this ebook, Xometry provides some pointers on designing mating parts and parts for specific functions. Chapters include: general machining tolerances, clearance and interference fit, how to avoid over-tolerancing, CAD drawing prep and specs, and an inspection report cheat sheet.
Get this valuable resource from Xometry.


Specifying metal inserts for molded plastics

Teaming with insert manufacturers that offer engineering expertise throughout the design and manufacturing process can be worth its weight in gold. Learn how two OEMs overcame their metal insert challenges by using advice and products from Tri-Star Industries, including specialty stainless steel parts and modifying the knurling on some inserts.
Read the full article.


Posi-Lok keyless shaft bushings for secure shaft-to-hub connection

Zero-Max offers a variety of options within the Posi-Lok keyless shaft bushings (PSL) product line that allow users to rigidly and reliably secure shaft-mounted components into position for optimal operating results in their machines. Options include material choices, plating, and different mounting methods. Posi-Loks are a superior shaft-hub locking solution, eliminating the need for keyways that can weaken or cause excess wear to shaft components. All Posi-Lok models easily slide onto a shaft for mounting and provide reliable, zero-backlash performance.
Learn more.


Automation: ECONOmaster drilling units -- affordable, flexible, get the job done

Suhner's ECONO-master® is a low-cost, high-output automated drilling unit that puts holes in light metal, composite, thermoplastic, and even wood substrates at high speed with excellent accuracy. It features low power and air consumption. On a recent project for Mid-State Engineering, Suhner custom ECONOmaster drill units -- featuring selectable drill heads that can be used in combination or individually -- were used to automatically drill holes into fiberglass panels for truck trailer bodies.
Read the full article.


Great Resources: Ultimate Guide to Injection Molding

Xometry has put together a comprehensive resource for injection molding -- from the basic principles to applications, tooling, materials, design features, and more. Learn how to optimize your part designs and choose the right surface finishes, textures, and post-processing for your projects. A super-handy resource worth bookmarking.
Read the Xometry Ultimate Guide to Injection Molding.


Sealing fasteners may optimize your designs

Highly specialized sealing fasteners include sealing screws, sealing nuts, sealing bolts, and sealing washers. Unlike ordinary fasteners, sealing fasteners are configured with a rubber O-ring (or a rubber element) that, when squeezed, permanently seals out a wide range of contaminants from entering and damaging equipment while preventing leakage of toxins into the environment. ZAGO sealing fasteners are designed to withstand harsh weather and extreme temperatures and are vibration and pressure resistant.
Learn all about ZAGO's wide selection of sealing fasteners.


Spirit levels with adjustment and cross-measurement

They may seem like relics from the past, but spirit levels remain indispensable tools in everyday industrial operations. Two new types from JW Winco now offer even better and faster alignment. The cross spirit levels GN 2276 combine two perpendicular linear levels within a single, round aluminum housing to show the alignment in two planes at once, making installation and leveling easier and faster. The new screw-on spirit levels GN 2283 are used to check the horizontal position of jigs, machines, devices, appliances, and instruments. These are available in a directly mountable, flat version (AV) and as an adjustable version (JV) with an alignment cam.
Learn more.


New cast urethane materials and finishes

Xometry has added new urethane resins and finishes as options for quick and affordable low- to mid-volume production. Urethane casting is used to make end-use, highly durable parts with robust mechanical properties. It is considered a "soft-tooled" process, where a silicone mold is formed around a master pattern -- usually 3D printed. Xometry has materials in two main durometer classes, rigid (Shore D) and rubber-like (Shore A). Finishes include matte/frosted, semi-gloss, high-gloss, and custom.
Read this informative Xometry blog.
Get the Xometry Urethane Casting Design Guide.


New molded-in aluminum threaded inserts for plastics

SPIROL has introduced a new, high-performance series of Molded-In Inserts for plastics assemblies. The rugged design of the Series 63 Through Hole Inserts and Series 65 Blind End Inserts consists of multiple bands of helical knurls to maximize torque resistance, balanced with radial undercuts to achieve high pull-out (tensile) force. These Molded-In Inserts are designed to be placed in the mold cavity prior to plastic injection. They offer exceptional performance due to unrestricted plastic flow into the retention features on the outside diameter of the Inserts.
Learn more.


Superlubricant may reduce wear and tear on space rovers -- and have Earth applications too

As NASA's Mars Perseverance Rover continues to explore the surface of Mars, scientists on Earth have developed a new nanoscale metal carbide that could act as a "superlubricant" to reduce wear and tear on future rovers.

Researchers in Missouri S&T's chemistry department and Argonne National Laboratory's Center for Nanoscale Materials, working with a class of two-dimensional nanomaterials known as MXenes, have discovered that the materials work well to reduce friction. The materials also should perform better than conventional oil-based lubricants in extreme environments, says Dr. Vadym Mochalin, associate professor of chemistry at Missouri S&T, who is leading the research.

"These superlubric materials are of special interest for advanced anti-wear and lubrication applications in extreme conditions, like those now experienced by the Perseverance rover on Mars," Mochalin says. He and his colleagues describe their discovery in a paper published in the March 2021 edition of the journal Materials Today Advances.

Photo illustration of a Mars rover designed by Missouri S&T students depicting the idea of MXene superlubric sheets applied to the machine's moving parts to reduce friction and wear. [Image credit: Shuohan Huang/Missouri S&T]

 

 

 

 

Mochalin says he made the connection between this research and Perseverance's journey to Mars after watching the rover landing.

"When I watched the landing of the rover on Mars, I thought: 'What if the lubricant in one of its wheels fails? Then I made the connection with our work on MXenes, because it came to mind that we have just found that MXenes demonstrate superlubricity in an atmosphere devoid of oxygen and humidity, close to what is there on Mars," Mochalin says.

MXenes (pronounced Maxines) are metal carbide materials that possess unusual properties. For example, their ability to conduct electricity makes them candidates for use in energy storage, sensing, and optoelectronics. In this latest study of the materials, Mochalin and his team conducted a series of tests to determine how well they act as solid-state lubricants with certain materials.

Friction testing
The researchers conducted ball-on-disk friction tests at the nanometer scale by depositing a titanium carbide MXene onto a silicon substrate (the disk) that was coated with a thin layer of silica, which is the major ingredient of sand. They then tested the MXene's ability to withstand wear by sliding it against a diamond-like carbon-coated steel ball. They conducted these tests in a dry nitrogen environment, which greatly reduces humidity.

Mochalin says the tests found that the MXene interface between the steel ball and silica-coated disk resulted in a friction coefficient in the "superlubric regime" of 0.0067 to 0.0017. Friction coefficient refers to the amount of friction between two objects and is determined by a value that is usually between 0 and 1. The lower the value, the less friction.

When the team added graphene to the titanium carbine MXene, the results were even better. Adding graphene "further reduced the friction by 37.3% and wear by the factor of 2" without affecting the MXene's superlubricant properties, the researchers write in their paper.

"These results open up new possibilities for exploring the family of MXenes in various tribological applications," write Mochalin and his colleagues. Tribology is the study of friction, wear, and lubrication of interacting surfaces.

Down-to-earth benefits
While such superlubricants may prove useful for machines in extraterrestrial environments -- from Mars rovers to asteroid mining equipment -- they also may have more down-to-earth benefits. Unlike oil-based lubricants, MXenes would not rely on non-renewable energy sources such as coal or petroleum, Mochalin says.

Shuohan Huang, a Ph.D. candidate in chemistry at Missouri S&T, is the paper's lead author and works closely with Mochalin on the study of MXenes. Mochalin's Missouri S&T group studies the fundamental physics and chemistry of the materials and develops their properties and potential applications in optoelectronics, energy storage, sensing, and mechanics.

Huang and Mochalin's co-authors on the paper are K.C. Mutyala and A.V. Sumant of Argonne National Laboratory's Center for Nanoscale Materials.

Source: Missouri University of Science and Technology

Published April 2021

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