June 14, 2022 Volume 18 Issue 22

Mechanical News & Products

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High-end precision guide rollers -- new design

Guide rollers may seem like simple, standard parts, but these rollers with ball bearings are in exceptionally high demand. JW Winco has expanded its guide roller offering to include the standard part GN 753.1. With its entirely new design, these guide rollers have a special deep groove ball bearing of hardened roller bearing steel. They are available in six sizes, from 0.866 to 1.969 in. (22 to 50 mm) outer diameter. The bearing features permanent lubrication and a typical 2Z seal to protect against dust and dirt (in other words, the bearing is covered on both sides by metal disks).
Learn more from JW Winco.


VariBlast Precision Safety Air Gun is the People's Choice

EXAIR's VariBlast® Precision Safety Air Gun has won the 2022 People's Choice award from Professional Tool and Equipment News (PTEN). These safety air guns provide a focused blast of air capable of handling tough jobs with remarkable strength while minimizing air consumption and noise. This OSHA-safe air gun employs an engineered, full-finger, variable-flow trigger. The VariBlast is available with a standard 12- or 20-in. extension that can also be outfitted with type 316 stainless steel or PEEK thermoplastic air nozzles for non-marring applications.
Learn more.


Stacked conveyor system supercharges tea company production

Watch how Bosch Rexroth's VarioFlow plus conveyor system, designed using a stacked configuration, moves products smoothly and quickly within a narrow footprint at the Yamamotoyama of America tea company in Pomona, CA. The facility operates multiple tea bag manufacturing and carton machines, each of which can produce 300 tea bags (which is 18 full cartons of tea bags) per minute. VarioFlow plus is a flexible, modular plastic chain conveyor system used for moving high-volume packaged goods. The solution has been a huge success for the facility, increasing production speed without damaging products.
View the video.


New sizes: SureFrame cut-to-length T-slotted rails

Automation-Direct has added new 30 x 60 mm and 60 x 60 mm profiles to its SureFrame 30 Series lineup of cut-to-length T-slotted extruded aluminum rails. These structures are lightweight, economical, versatile, and easy to construct, with uses ranging from stands that hold barcode scanners and label applicators to OEM machines made entirely of T-slotted aluminum rail. The rails are available in the most popular profiles and dimensions, are compatible with many other brands, and can be cut to your specified lengths in increments of 0.001 in. with no cutting fees.
Learn more.


Siemens offers Virtual Product Expert for CNC

Siemens has introduced the Virtual Product Expert (VPE), a new online support program for its CNC machine tool users, machine builders, dealers, and importers. Through the VPE program, customers can interact directly with a SINUMERIK CNC product expert and have their specific operation and programming questions answered, from the basic functions of the control to the most advanced machining technology aspects of the hardware and software suites. Best of all, this service is offered to all Siemens CNC community members at no cost.
Learn more.


Create your perfect parts: Xometry Manufacturing Design Guides

Need to order parts and get it right the first time? Xometry provides more than 17 manufacturing processes, including CNC machining, 3D printing, injection molding, sheet cutting, and more. Get in-depth design-for-manufacturing tips, specs, and best practices for Xometry's services. Optimize your designs, reduce manufacturing time, and lower your costs. Case studies available too.
View the Xometry Manufacturing Design Guides.


How slip clutches can help maximize your designs

The way they see it over at Polyclutch, there aren't a whole lot of problems you can't solve with a slip clutch. Way beyond using them for overload protection, there are a surprising number of other applications for these versatile and valuable components. From increasing machine speeds and applying constant tension on wire to indexing a conveyor and automatic screw assembly, slip clutches just may provide the design leverage you've been seeking.
Read the full article.


New high-performance metals for 3D printing

3D Systems has added two new materials to its materials portfolio. Certified HX is a high-performance nickel alloy that contains a higher percentage of molybdenum (up to 9.5%) vs. other nickel alloys, which enhances strength and resistance to corrosion, creep deformation, cracking, and oxidation in hot-zone environments. Certified CuCr2.4 is a high-strength, corrosion-resistant copper alloy that is significantly stronger than pure copper and easier to process. Both materials are certified for use with the company's DMP Flex 350 and DMP Factory 350 3D printers. Applications include industrial gas turbines, consumer goods, aerospace and defense, and automotive.
Learn more.


COMSOL Multiphysics Version 6.1 is here!

COMSOL has released the latest version of its modeling and simulation software. COMSOL Multiphysics version 6.1 is full of feature additions and workflow enhancements. "This version provides our users with powerful multiphysics simulation tools in areas of highly competitive R&D, like audio technology and vehicle electrification," says Bjorn Sjodin, VP of product management at COMSOL. "We have also strengthened the software's foundation with new capabilities for optimization and the modeling of turbulent flow and mechanical contact."
Learn more.


How to design a 10-in. cast-iron skillet in SOLIDWORKS in 10 min.

The engineers over at TriMech are always providing new tips, tricks, and tutorials. This time around, they have put together a 10-min. SOLIDWORKS demo on how to design a cast-iron skillet. The video covers sketch relations and dimensions to fully define the geometry and applying three-dimensional features. From beginner to advanced user, TriMech provides excellent training support.
View the video.


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.


Design Tips: Build strength into parts with insert molding

Plastic injection-molded parts are tough and strong, able to withstand heavy loads, moderately high temperatures, and the corrosive effects of acids and alkalis. In some cases, plastic even competes with metal, and is lighter and usually less expensive to boot. But once in a while plastic needs a little help, like when the bore in an all-plastic pulley quickly wears out or tapped holes in molded handles and knobs get prone to stripping. In these cases, say hello to insert molding.
Read the full Protolabs article.


New flame-retardant resin for 3D printing

3D-printing tech company Carbon has introduced an all-new photopolymer resin called EPX 86FR that the company says offers an unmatched combination of flame retardance, functional toughness, high strength, and long-term stability for end-use parts, functional prototypes, and tools in the automotive and industrial sectors.
Learn more.


New TurboBlast Safety Air Gun for heavy-duty jobs requiring powerful blowoff

EXAIR's new TurboBlast Safety Air Gun is the latest addition to the EXAIR line of Safety Air Guns. This dynamic air gun is capable of producing up to 23 lb of force with a simple press of a button trigger and is the ideal solution for blowoff applications requiring maximum force such as removing stubborn or heavy debris like slag and flash, part drying, or cooling from a distance, as well as heavy-duty cleanup in busy facilities. Available in different flow rates and extensions up to 6 ft long.
Learn more.


Guide to vibration-proof fasteners

How do you ensure the fasteners you're using won't loosen in an application that is prone to vibration? Engineers frequently debate that question. The experts at JW Winco run through the common solutions, including threadlockers, pre-installed nylon patches, and more.
Read this short, informative engineering tip.


Ordinary silicone wristbands track firefighters' exposures to harmful chemicals

New Duke University research shows that silicone wristbands can be used to track firefighters' exposures to 134 dangerous chemicals, including PFAS. [Photo credit: Durham, NC, Fire Department]

 

 

Firefighters have a 9% higher risk of being diagnosed with cancer and a 14% higher risk of dying from the disease than the general adult U.S. population, according to studies by the National Institute of Occupational Safety and Health and other agencies.

Recent research by scientists at Duke University could give doctors and public health officials a new tool for tracking firefighters' exposures to cancer-causing chemicals and determining where and when the risks might be greatest.

The cool thing is, it's not some expensive high-tech gadget. It's just a silicone wristband, purchased in bulk for about $1 apiece.

"It turns out that ordinary silicone wristbands, like the ones sold in stores, absorb the semi-volatile organic compounds you're exposed to while you're out in the world," said Jessica Levasseur, a PhD student at Duke's Nicholas School of the Environment, who led the study.

"It's like taking fingerprints of everywhere you've been and everything you've been exposed to," Levasseur said.

The decision to use the bands to track firefighters' risks came about when the Durham Fire Department (DFD) approached Duke researchers for help in identifying exposure risks its firefighters faced.

"Firefighters have high cancer rates compared to the general population, but we don't know why," Levasseur said." Is it caused by exposure to one chemical or a mix of them? Is it something they breathe in while working in fires or being near them? Or something else? There are lots of risk factors and potential routes of exposure, and we wanted to see if silicone wristbands could be a practical tool for disentangling them."

Working with other researchers at the Nicholas School and the Duke Cancer Institute, Levasseur asked 20 firefighters from DFD to wear the wristbands while working a typical six-day shift, and then to get each firefighter's baseline exposures while off duty.

Each wristband was analyzed for 134 different chemical compounds, including phthalates, brominated flame retardants, organophosphate esters, polycyclic aromatic hydrocarbons (PAH), and per- and polyfluoroalkyl substances (PFAS), all of which have been linked to increased incidence of certain cancers.

"Seventy-one of these chemicals -- including seven PFAS, which to our knowledge have never previously been detected using wristbands -- were found in at least half of the bands," Levasseur said.

Levels of PAH, brominated flame retardants, and organophosphate esters were 0.5 to 8.5 times higher in the wristbands worn while on duty than in those worn while off duty. This suggests that just being a firefighter means you are exposed to more of these compounds than the average adult, regardless of whether you respond to a fire while working.

Bands worn by firefighters on days they actively fought a fire also contained 2.5 times more PFOS -- a type of PFAS -- than the bands of firefighters who were not called to a fire. This suggests that exposure to these contaminants is strongly associated with active firefighting, Levasseur said.

In contrast, wristbands worn on off-duty days contained higher levels of phthalates and pesticides.

"This research is the first to demonstrate that silicone wristbands can be used to quantify occupational exposure in firefighters and distinguish exposures that may be related to fire events versus other sources," Levasseur said. "Conducting follow-up research with a larger population will help pinpoint the exposure sources that contribute to firefighters' risk for cancer and assess exposure risks that may be related to chemicals off-gassing from their gear or materials in their firehouse, which we did not examine," she said.

She and her colleagues published their peer-reviewed findings April 26 in the journal Science of the Total Environment.

Source: Duke University

Published June 2022

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