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Think Allied for Automation & Control September 2015 www.designworldonline.com INSIDE: 84 FASTENING & JOINING: Enable efficient structures with friction stir welding. PAGE 106 SENSORS: Current industry requirements provide new direction. PAGE 114 busbars and IEC standards reigns supreme with LINEAR MOTION: Components for linear motion systems change with the times. PAGE 74 Modular

Design World September 2015

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Modular reigns supreme with busbars and IEC standards. Sensors: Current industry requirements provide new direction. Linear Motion: Components for linear motion systems change with the times. Fastening & Joining: Enable efficient structures with friction stir welding

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  • Think

    Allie

    d for

    Autom

    ation

    & Co

    ntrol

    APR15-A&C Snipe_Snipe 3/13/15 2:39 PM Page 1

    September 2015www.designworldonline.com

    INSIDE:

    84

    FASTENING & JOINING: Enable efficient structures with friction stir welding. PAGE 106

    SENSORS: Current industry requirements provide new direction. PAGE 114

    busbars and IEC

    standards

    reigns supreme with

    LINEAR MOTION: Components for linear motion systems change with the times. PAGE 74 Modular

    Cover_DW_September 2015_FINAL.indd 1 9/8/15 9:49 AM

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  • I n s i g h t s

    4 DESIGN WORLD September 2015

    Earlier this year, I was part of a journalist delegation to Thailand, the Southeast Asian country thats probably known more for tourism than industrial engineering prowess. But after a week of touring manufacturing facilities that included such international heavyweights as Caterpillar and Nissan, I left with a new mindset for how industry needs to succeed in todays global economy. And here are three key areas where I found that Thailand seems to be getting it right:

    1. Get government buy-in. Thailands government has been active in promoting investment in the private sector for decades. The Board of Investment, founded in 1966, actively works with manufacturers to encourage them to build factories in the country. Theres a liberal investment policy, with 100% foreign ownership allowed, no export requirements and no restrictions on foreign currency. Corporate tax exemptions are granted for up to eight years.

    2. Education has to focus on emerging technology. Automation is here on the factory floor, so its best to embrace it. I toured the Institute of FIeld roBOtics (FIBO) at King Mongkuts University of Technology, and it was refreshing to see such a variety of developments happening. Researchers and students were looking at the entire spectrum of robotics, from industrial to medical to entertainment. Thai universities know that there is a huge need for qualified engineers in this growing industrial space in their country, and theyre actively answering the call.

    3. The right kind of training for blue collar workers is critical. We hear so much about the skills gap in the U.S., so I was really impressed upon visiting the Thai-German Institute, a joint initiative of those two countries. Founded two decades ago to be a conduit for transferring high-tech industrial knowledge into the country, its blossomed into a training center for advanced manufacturing technology. They conduct short, medium and long term training in a realistic actual factory setting. More than 300 courses are offered on subjects including fluid power, predictive maintenance, PLCs, motors and drives, mechatronics, robotics, testing, welding and CAD. Theres a fantastic 12:1 student to teacher ratio, and youll generally find one student per machine, so this is truly hands-on learning.

    Thailands industrial sector still has challenges, for sure. Leaders clearly want more R&D type investment, and that may be a difficult road. Its one thing for foreign companies like Caterpillar or Nissan to build plants there, but the tougher push is trying to break past the assembly side of manufacturing. Higher incentives are in place for R&D type ventures, and it will be interesting to see if that gamble pays off.

    What manufacturing can learn from Thailand

    Pa u l J. H e n e y - Ed i to r i a l D i re c to rp h e n e y@w tw h m e d i a .co m

    What do you think manufacturers need to do now to improve their bottom lines?

    Comment on Pauls blog on Pneumatic Tips, www.pneumatictips.com/blog On Twitter @ DWEditor

    Insights 9-15_Vs3.LL.MD.indd 4 9/2/15 3:31 PM

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  • Te s c h l e r o n To p i c

    Big data, of course, refers to the use

    of predictive analytics to extract value

    from data, usually lots of data. Big data

    is thought to hold a lot of promise for

    improving industrial operations and

    making them more productive. In a

    perfect world, big data techniques

    will help predict when complicated

    production equipment will breakdown

    well before there are obvious signs of

    trouble. They will also eliminate minute

    variations in manufacturing processes

    that degrade product quality.

    L e l a n d Te s c h le r - Exe c u t i ve Ed i to rlte s c h le r @w tw h m e d i a .co m

    My big data nightmare

    On Twitter @ DWLeeTeschler

    6 DESIGN WORLD September 2015

    In reality, most manufacturers could experience big data as an expensive exercise in chasing your own tail. To understand the reason why, consider what goes on at a National Science Foundation facility in Cincinnati called the IMS Center for Intelligent Maintenance Systems. The IMS Center directs a lot of high-powered research at eliminating fix and fail maintenance, replacing it with predict and prevent efforts where production machines will never go down and the products coming off manufacturing lines never have variations. Big data is the heart and soul of the Centers efforts. Its not unusual for production machines the Center studies to each generate a terabyte of data every day. The IMS Center had a meeting a while back that makes clear the kind of intellectual horsepower it takes to profit from big data coming out of factories. The meeting was basically a room full of super-sharp Ph.D. candidates. One applied something called Mahalanobis-Taguchi methods to predict the health of rolling element bearings on a CNC machine spindle. The math got pretty deep pretty fast. He looked at a virtual sea of sensor readings while using a Mahalanobis distance to gauge the abnormality of patterns within them, then applied Taguchi methods to evaluate the accuracy of machine health predictions. Another researcher predicted defect levels in semiconductor wafers using sensor data massaged with autoregressive moving averages and ensemble methods. Ensemble methods are basically machine learning techniques

    using arcane numerical methods such as Bayes optimal classifiers, bootstrap aggregation and Bayesian parameter averaging. If you get the idea these big-data projects involved a lot of rocket-science calculations, youd be right. Trouble is, most industrial concerns are likely to apply big data without having the insights of the IMS Center. Heres the scene that could unfold: The people who will try to make sense of data coming from production-line machines will be engineers, not data scientists. These engineers all have had a basic statistics class in school. They have never heard of Mahalanobis-Taguchi or Bayesian parameter averaging. So they may just assume all the sensor readings they see follow bell curve distributions. Real data scientists, like those at the IMS Center, would look at the bell curves and basic statistics going to these efforts and realize they are just too simplistic to ever work. But the people on the shop floor are unlikely to see the problem. The sinister thing about this scenario is that the underlying behavior models will be wrong but will occasionally lead to random correct predictions about machine behavior. The engineers involved will believe that they are just a few tweaks away from a system that works wonderfully. In reality, they will be spinning their wheels guided by a model filled with unknown unknowns. Until expectations catch up with the reality of the resources it takes to mount a successful effort in factories, big data will be a big disappointment and possibly an expensive nightmare. DW

    I have had a vision of what big data will look like on the factory floor. And it is scary. Really scary.

    Lee Teschler Column 9-15_Vs4.LL.MD.indd 6 9/2/15 3:26 PM

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  • Follow the whole team on twitter @DesignWorld

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    Senior EditorMiles [email protected]@dw_Motion

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  • July 2015 DESIGN WORLD 1 1

    l C o n t r i b u t o r s S p o t l i g h t

    84Work with stronger joints and lighter materials

    MARY C. GANNONSenior EditorDesign World

    NATHAN XAVIER

    Consulting EngineerRittal Corp.

    IEC devices and busbars take down control-panel costs 106

    How IIoT is being used now

    LESLIE LANGNAUManaging EditorDesign World

    September 2015 DESIGN WORLD 1 1

    74

    Leslie has been an editor for more than 28 years. She has been covering the 3D printing/additive manufacturing industry, among other subjects, since joining with Design World more than 8 years ago. She has a B.S. degree in Mechanical Engineering from Michigan State University.

    1. What trend or new technology would you like to see emerge over the next five years? I would like to see better ways to ensure/encrypt your data for security. I know a big part of the problem is users just dont change factory settings. Thats an easy fixprevent the device from working until they change the setting. But I for one will not buy IoT devices for the home. I simply dont trust that any of these devices will have strong enough security levels. 2. What do you think is the biggest issue editors face today? Getting noticed in the right way. You want people to read your work and value the information and explanations you deliver. But its unfortunate that we have to play the click-bait game to get attention. My colleagues know I dont like headlines such as 3D print an organ! Its technically not possible yet, and may never be. Accuracy is compromised in favor of popularity.

    Nathan Xavier has been with Rittal since 2007. He holds a B.S. in Mechanical Engineering and provides customer-specific applications support relating to Rittal industrial enclosure and power distribution solutions.Mary primarily covers fluid

    power and interconnect technologies. She has been working as a technical editor for 10 years. She earned her B.S. in Journalism at Boston University in 1998, and has worked as a business reporter, public relations associate and now technical editor.

    1. How do you think the world will change in the next 20 years?I think well be more connected, with continually faster and faster technologies changing how we live and do business daily. I think our society will be more reliant on technology.

    2. What technology do you find the most frustrating? Wearable tech. Not only are most of these devices not that accurate or where they will probably be in the next five years, I do find them to be almost confining as we are constantly needing to check our smart watches and Fitbits. [Even though] we clearly know were walking ourselves, if were not tracking it, it somehow doesnt count. And thats absurd when you think about it.

    96

    Miles has been in the publishing world for 15 years, more than six of which have been spent with WTWH Media. He holds a BSEE and M.A. in Philosophy. He previously worked as an engineer for a small controls company. Miles has also taught electronics courses at local tech colleges and has been teaching philosophy part time (adjunct) for about 10 years.

    1. What part of society do you see being most affected by advances in engineering over the next decade? Computing and internet technology have changed practically every aspect of society and continue to do so every day. But also, it looks like robotics and AI, as well as medicine, will also experience revolutionary changes.

    2. What first attracted you to the world of media/publishing? Maybe it was my love of the printed word. As far back as I can remember, Ive always been surrounded by printed matter, and my parents were big readers as well, so it probably rubbed off on me in some mysterious way.

    Linear Evolution

    MILES BUDIMIRSenior EditorDesign World

    Contributor Page 9-15_Vs3 MG.MD.indd 11 9/3/15 4:37 PM

  • Te c h n o l o g y F o r w a r d

    Change is a constant with additive

    manufacturing (AM), also known

    as 3D printing. The next trend

    youll find is the growth of additive

    services. Part of this growth is

    driven by customer need, part by

    the frequent acquisitions made by

    the larger vendors.

    L e s l i e L a n g n a u - M a n a g i n g Ed i to rl la n g n a u r @w tw h m e d i a .co m

    Additive manufacturing moves beyond the cool phase

    On Twitter @ DW3Dprinting

    1 2 DESIGN WORLD September 2015

    Customer need turns out to be an interesting driver. SMS Research Advisors conducted a survey on AM. The majority of the 700 respondents are familiar with additive and its benefits: 79% know AM gives users access to more complex design capabilities, 79% know it reduces lead time for product development and 42% see AM improving manufacturing efficiency. But only 20% see AM improving product quality and enabling more integrated products. Still, knowledge and understanding about AM is fairly strong. The respondent makeup was 47% engineer, 15% designer, 14% executive, 13% other and 9% project manager. What was more interesting from this survey was the view about the choice between in-house versus outsourcing additive projects. About 73% of the respondents see service bureaus as giving them access to advanced equipment. 60% see less of an investment risk by using service bureaus (versus

    purchasing a machine). 53% said service bureaus are a way to produce parts that cannot be internally manufactured. And 47% said service bureaus offer access to additive expertise. Selling AM machines to end users may no longer be the main goal of vendors in this industry. Instead, a trend may be developing where vendors offer AM production services for users. Survey respondents noted several challenges with AM machines: 63% said current costs were an issue, while 58% felt that future costs wont be as much of an issue. Post-processing and material availability were seen as challenges now and in the future, with the future coming in at 34% and 46% respectively.

    Noted Joe Allison, CEO of Stratasys Direct Manufacturing, such challenges indicate that the industry should change the conversation from one of emphasizing AMs technical benefits to that of AMs overall business value. I recently had the opportunity to visit the fairly new Stratasys Direct Manufacturing company at its Austin plant. This company emerged from the acquisitions of Solid Concept, RedEye and Harvest Technologies. It is one of the largest service bureaus in the U.S. In the past 12 to 18 months, it has tripled its capacity to prototype and build customer parts, with much of that growth coming in metals. Imagine a company with the following machines: 13 Polyjet, 42 stereolithography, 43 laser sintering, 97 extrusion, 14 direct metal laser sintering, 23 CNCs and 13 injection molding systems. Yeah, impressive. In addition to these technologies, the company also offers urethane casting, tooling and finishing services. Several of the laser-sintering machines are DTM versions before that company was bought by 3D Systems. Stratasys Direct Manufacturing is additive technology agnostic. Most of the direct metal laser-sintering machines come from EOS. Metal additive projects are more likely to be outsourced to a service bureau than done in house. Many of the reasons have already been mentionedaccess to advanced equipment, less risk and the ability to manufacture parts not possible internally. The survey indicates that AM is moving to the next phase. First, it changed how prototypes were made. Now its changing how production parts are made. The survey also indicates that many engineers and designers are optimistic about using AM. They generally believe it will play an important role in manufacturing in the future. DW

    Leslie's Column 9-15_Vs3.LL.MD.indd 12 9/2/15 3:30 PM

  • Applied Motion Products 9-15.indd 13 9/2/15 3:40 PM

  • 2015

    3

    Co n te n t s | S e p t e m b e r 2 0 1 5 v o l 1 0 n o 9 | d e s i g n w o r l d o n l i n e . c o m

    1 4 DESIGN WORLD

    LINEAR MOTION

    Linear EvolutionFrom nanometer resolution to high-force actuation, components for linear motion systems are changing with the times.

    74

    F E A T U R E S

    96 INDUSTRIAL ETHERNETHow IIot is being used nowThe latest development of industrial Ethernet is how it will be a part of the Industrial Internet of Things (IIoT).

    2015

    revenue over $3 million

    ELECTRONICS

    Busbars and IEC devices take down control-panel costsMore North American engineers than ever use IEC devices instead of NEMA componentsespecially with modular busbars to replace

    traditional wiring for controls.

    84

    ON THE COVERBusbars and standardized IEC devices let integrators build systems less expensively than ever.

    Image courtesy of Rittal

    106 FASTENING & JOININGWork with stronger joints and lighter materialsEnable consistent, strong and more efficient structures with friction stir welding. 2015

    ONLINE

    114 SENSORSIndustrial sensing evolves to address the IoTCurrent industry requirements are providing new direction for industrial sensors

    126 MACHINE VISIONImage dimension measurement system makes tolerance checks fasterWhen a French manufacturer required precise measurement of medical parts, a new imaging system brought the flexibility to accurately measure 99 points in mere seconds.

    CONTENTS SEPTEMBER 2015_first page_Vs3.LL.indd 14 9/2/15 4:18 PM

  • Altech 9-15.indd 15 9/2/15 3:41 PM

  • Co n te n t s

    D E P A R T M E N T S

    4 Insights

    6 Teschler on Topic 11 Contributors

    12 Technology Forward 18 Green Engineering

    22 Engineering Exchange

    24 Design For Industry

    40 Design Notes

    50 Coupling Notes

    54 CAE Solutions

    62 Internet of Things

    131 Product World

    140 Ad Index

    9. 2 0 1 5

    1 6 DESIGN WORLD September 2015

    40

    62

    50

    24

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  • Energy storage solutions forsolar-powered devicesn By: Sol Jacobs VP and General Manager Tadiran Batteries

    G r e e n E n g i n e e r i n g

    1 8 DESIGN WORLD September 2015

    Energy harvesting is seeing dramatic growth, especially for wireless devices that use small photovoltaic systems to draw energy from sunlight. The energy storage solutions being used in

    photovoltaic systems are also applicable to similar devices that harvest energy from vibration/

    motion, heat differential and RF/EM signals.

    There are five basic components to an energy harvesting device: sensors, transducer,

    energy processor, microcontroller and optional radio link. The sensors detect and measure

    environmental parameters such as motion, proximity, temperature, humidity, pressure, light,

    strain vibration and pH. The transducer and energy processor work in tandem to convert, collect

    and store the electrical energy in either a rechargeable lithium battery or a supercapacitor.

    The microcontroller collects and processes the data. The radio link communicates with a host

    receiver or data collection point using RF or cell phone technology, typically in conjunction with

    low-power communications protocols such as ZigBee, Green Power, Bluetooth LE and

    6LowPan, which all operate within a peak power range of 10 W to 100 mW.

    The power available through energy harvesting is sometimes limited and

    variable, so design engineers need to find ways to conserve energy wherever

    possible. This is possible through power-efficient microprocessor and component

    design, as well as by programming the device to remain in a dormant state that

    draws little or no energy, then to periodically query the data, awakening only if

    certain thresholds have been exceeded.

    To determine if a remote wireless application is well suited for energy

    harvesting, several factors need to be considered, including the reliability of

    the device and its energy source, the expected operating life of the device,

    environmental requirements, size and weight considerations, and total cost

    of ownership. Remote wireless applications characterized by a processor

    that awakens periodically often draw a big, brief pulse of current at periodic

    intervals. The current pulse arises when the processor awakens and transmits

    its data. The current levels can be on the order of hundreds of milliamps or

    more for time periods ranging from fractions of a second to several seconds.

    These sorts of power levels necessitate some form of energy storage capability

    using either a rechargeable Lithium-ion (Li-ion) battery or a supercapacitor.

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    (EDLCs), are often used to backup memory in mobile phones, laptops, digital cameras and other

    consumer devices. Supercapacitors work by storing energy in an electrostatic field rather than

    in a chemical state.

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  • Dunkermotor is a leading manufacturer of customized rotary and linear motion solutions providing low-risk product development, lower total system cost and faster time to market for original equipment manufacturers in the automation, medical, solar, packaging, semiconductor and transportation industry segments. 1500 Bishop Ct - Mt Prospect, IL 60056

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    Dunkermotor 9-15 new logo.indd 19 9/2/15 3:46 PM

  • G r e e n E n g i n e e r i n g

    2 0 DESIGN WORLD September 2015

    Additionally, their energy density is low and they

    have a high self-discharge (up to 60% per year).

    Supercapacitors linked in series also require

    balancing circuits. As a result, supercapitors are

    much bulkier than comparable industrial grade Li-

    ion batteries.

    Certain energy harvesting applications may

    be well suited for standard consumer-grade Li-ion

    cells that are relatively inexpensive and widely

    available. However, consumer grade LI-ion batteries

    have notable limitations. These limitations include

    a life expectancy of less than five years and 500

    recharge cycles, and a temperature range of only 0

    to 60 C.

    Industrial-grade Li-ion batteries are probably a

    better bet if the wireless device is intended for use

    in remote, inaccessible locations where battery

    replacement is difficult or impossible, or in extreme

    environmental conditions. These ruggedized

    batteries can deliver up to 20 years of operating

    life with 5,000 full recharge cycles, along with an

    expanded temperature range of -40 to 85 C. They

    can also provide high-current pulses (5A for a

    AA-size cell) common in remote energy harvesting

    uses. Industrial grade Li-ion cells also feature

    glass-to-metal hermetic seals, whereas consumer

    rechargeable Li-ion batteries use crimped seals that

    may leak.

    Industrial grade Li-ion batteries are generally

    recommended for applications that involve extreme

    temperatures and remote, inaccessible locations,

    where the labor to replace a battery can often far

    exceed the cost of the battery itself. Industrial

    grade Li-ion batteries also make sense for use in

    large-scale projects, where their 20-year operating

    life can eliminate multiple rounds of scheduled

    battery change-outs, while also reducing the

    potential risk of compromised data and lost revenue

    due to battery failure. All these factors should

    be considered when estimating the total cost of

    ownership, an important yardstick when choosing

    between consumer grade and industrial grade Li-

    ion batteries. DW

    Tadiran Batteries tadiranbat.com

    Generally speaking, supercapacitors are

    not well suited for long-term deployment

    in industrial wireless devices. They excel

    at providing short bursts of energy. But

    their discharge qualities are such that

    applications cant use all their available energy.

    ROLLER CHAINS ENGINEERING CLASS CHAINS CAM CLUTCHES SPROCKETS CABLE & HOSE CARRIERS PT COMPONENTSROLLER CHAINS ENGINEERING CLASS CHAINS BACKSTOPS SPROCKETS CABLE & HOSE CARRIERS POWER TRANSMISSION PRODUCTS

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    INTRODUCING THE CUSTOMERS CHAMP... TSUBAKI BACKSTOPS.

    Just like the full range of Tsubaki products, Tsubaki backstops provide the winning combination; unmatched quality, durability, reliability and service & support. Prove youre a winner too by protecting your application against costly downtime with Tsubaki brand backstops and clutches.

    WITH OVER 50 YEARS OF GLOBAL EXPERIENCE, YOULL WANT TSUBAKI BACKSTOPS IN YOUR CORNER

    Green Engineering_9-15_Vs4.LL.MD.indd 20 9/2/15 4:12 PM

  • www.catalystmotiongroup.com

    A single resource for integrated mechanical, electronics, drives and software, with experienced customer support for the development

    of simple-to-sophisticated automation systems.

    At Catalyst Motion Group

    We are able to accomplish this through coordinated utilization of our extensive engineering resources and vertically integrated manufacturing resources.We put it all together customized motion systems that include stepper motors, brush and brushless DC motors, linear mechanics, drives, electronics and an extensive array of peripheral system components. Our considerable and wide-ranging in-house manufacturing capabilities allow us full control of the entire process, from development of prototypes to delivery of fully tested production units. And, with our engineering capability, if we don't have it ...we can develop it! We have successfully developed and taken to production fully customized motion solutions for a wide variety of advanced technologies including: Medical devices for diagnostics, surgical procedures, therapeutics and pharmaceuticals Laboratory and analytical instrumentation and equipment Industrial automation including robotics and production line processing operations

    resource ready to respond to your most challenging motion control needs.

    Your Catalyst to InnovativeMotion Control Solutions

    1500 Meriden Road Waterbury, CT 06705 U.S.A. Call 1 203 725 3852

    CATALYSTM O T I O N G R O U P

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    www.catalystmotiongroup.com

    A single resource for integrated mechanical, electronics, drives and software, with experienced customer support for the development

    of simple-to-sophisticated automation systems.

    At Catalyst Motion Group

    We are able to accomplish this through coordinated utilization of our extensive engineering resources and vertically integrated manufacturing resources.We put it all together customized motion systems that include stepper motors, brush and brushless DC motors, linear mechanics, drives, electronics and an extensive array of peripheral system components. Our considerable and wide-ranging in-house manufacturing capabilities allow us full control of the entire process, from development of prototypes to delivery of fully tested production units. And, with our engineering capability, if we don't have it ...we can develop it! We have successfully developed and taken to production fully customized motion solutions for a wide variety of advanced technologies including: Medical devices for diagnostics, surgical procedures, therapeutics and pharmaceuticals Laboratory and analytical instrumentation and equipment Industrial automation including robotics and production line processing operations

    resource ready to respond to your most challenging motion control needs.

    Your Catalyst to InnovativeMotion Control Solutions

    1500 Meriden Road Waterbury, CT 06705 U.S.A. Call 1 203 725 3852

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    AMETEK Catalyst 8-15 (New).indd 21 9/2/15 3:44 PM

  • CONNECT with Design World

    DIGITAL ISSUE

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    Think

    Allie

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    APR15-A&C Snipe_Snipe 3/13/15 2:39 PM Page 1

    September 2015www.designworldonline.com

    INSIDE:

    84

    FASTENING & JOINING: Enable efficient structures with friction stir welding. PAGE 106

    SENSORS: Current industry requirements provide new direction. PAGE 114

    busbars and IEC

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    LINEAR MOTION: Components for linear motion systems change with the times. PAGE 74 Modular

    How additive technology will affect manufacturingFor 16 years, ExOne has focused its efforts on developing

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    Editorial Director Paul Heney chats about some

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    When choosing a coupling,

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    consideration.

    Engineering Exchange 9-15_Vs1.indd 22 9/2/15 4:10 PM

  • 2015 by AMETEK Inc. All rights reserved.

    Nothing moves air with more rock-solid reliability than AMETEK Rotron regenerative blowers. Fifteen years service life is not unusual. These low-pressure, high-volume blowers feature rugged, compact construction and quiet operation. Their proven design makes them ideal in applications from chemicals, wastewater and furnaces to vapor recovery and more. Plus, theyre backed by the industrys most knowledgeable engineering experts. AMETEK can customize your blower for harsh environments, high voltage and specialized applications, too. So make your next air-moving challenge a breeze. Call us at +1 330-673-3452 or visit our website to get started.

    Whats 15 years to one of our blowers?A warm-up.

    100 East Erie StreetKent, OH 44240ametekdfs.com

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  • 01

    m i l i t a r y / a e r o s p a c e

    D e s i g n f o r I n d u s t r y

    2 4 DESIGN WORLD September 2015 www.designworldonline.com

    Encoder for machines with loose mechanical motion

    Some machines have a significant amount of flexure near the area requiring motion feedback. The MSA 37x series linear motion feedback encoder system was designed for machines with loose mechanical motion during operation. These encoders suit motion applications such as press brake and metal forming/bending machines. The encoders include a bearing set internally for guiding the scanning optics, and a bearing set externally for the attachment of a coupling rod that affixes to the machine, thereby allowing for measurement of the moving elements of the machine. Digital TTL resolutions of 5 and 1 are possible, with accuracies up to 10 . The encoders also have magnetic limit switches that can be used to send end of travel signals to the control. Reference marks can be in the center, on either end of travel, or every 50 mm. The encoders are designed to handle large shock and vibrations, and the series is ROHS compliant. DW

    RSF Elektronik rsf.at/en

    m a c h i n e t o o l

    WHAT DO YOU THINK?

    Connect and discuss this and other design engineering issues with

    thousands of professionals online

    DFI 9-15_Vs6.LL.MD.indd 24 9/2/15 1:13 PM

  • Haydon Products Division1500 Meriden RoadWaterbury, CT 06705 U.S.A. Telephone: 203.756.7441Fax: 203.756.8724

    Kerk Products Division1 Kerk DriveHollis, NH 03049 U.S.A. Telephone: 603.465.7227Fax: 603.465.3598

    Call 1.8OO.243.2715

    www.HaydonKerk.com

    Haydon Kerk Motion Solutions Micro Series lead screw products enable a whole new range of micro-solutions that facilitate big advances in medical technology. The Micro Series provides precise control, reduced power consumption, and weight reduction without sacricing performance or reliability. Prototype kits are now available in our online store and shipments can be made in 24 hours.For custom, application-specic needs, Haydon Kerk oers in-house engineering and manufacturing including machining, mold making, and injection molding capabilities, strategically integrated to satisfy your needs for a hundred, a thousand, or a million assemblies. For more information: www.HaydonKerk.com > Lead Screws & Nuts > 2 mm Lead Screw

    SURGICAL PRECISION RE-DEFINED

    For extreme control in medical applications including infusion pumps, intravenous therapies, surgical robotics, radiology, opthalmic instruments, microscopes, and other instruments that require ultra-precise motion control in confined spaces.

    Haydon Kerk Motion Solutions Micro Series Lead Screw Technology

    Micro Series BFWR Rectangular Nut Assemblies

    Micro Series BFWB Barrel NutAssemblies

    24 -HR SHIPPING / E-COMMERCE

    2 mm (5/64-in) diameter Micro Series Standard Lead Screw Assembly

    www.catalystmotiongroup.com

    A single resource for integrated mechanical, electronics, drives and software, with experienced customer support for the development

    of simple-to-sophisticated automation systems.

    At Catalyst Motion Group

    We are able to accomplish this through coordinated utilization of our extensive engineering resources and vertically integrated manufacturing resources.We put it all together customized motion systems that include stepper motors, brush and brushless DC motors, linear mechanics, drives, electronics and an extensive array of peripheral system components. Our considerable and wide-ranging in-house manufacturing capabilities allow us full control of the entire process, from development of prototypes to delivery of fully tested production units. And, with our engineering capability, if we don't have it ...we can develop it! We have successfully developed and taken to production fully customized motion solutions for a wide variety of advanced technologies including: Medical devices for diagnostics, surgical procedures, therapeutics and pharmaceuticals Laboratory and analytical instrumentation and equipment Industrial automation including robotics and production line processing operations

    resource ready to respond to your most challenging motion control needs.

    Your Catalyst to InnovativeMotion Control Solutions

    1500 Meriden Road Waterbury, CT 06705 U.S.A. Call 1 203 725 3852

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    Haydon Kerk 9-15_updated.indd 25 9/2/15 3:47 PM

  • the #1 value in automationOrder Today, Ships Today!

    * See our Web site for details and restrictions. Copyright 2014 AutomationDirect, Cumming, GA USA. All rights reserved. 1-800-633-0405

    Research, price, buy at: www.automationdirect.com/circuit-protection

    Protect your gear at AutomationDirect prices!U

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    Ensure that your equipment is safeguarded at every point in the power distribution network with high-quality, cost-effective circuit protection and disconnection devices that meet UL standards.

    Theyll pay for themselves in no time!

    UL 248General Fusesstarting at $2.00 (5-pack)

    Class CC, general purpose class M (Midget) and small dimension glass and ceramic fuses Ideal supplementary protection up to 30 amps for branch circuits and 50 amps for end of line equipment

    UL 1077Supplementary Protectorsstarting at $9.00

    DIN rail mountable Optional busbar system and a full line of

    auxiliary switches, alarm switches and padlock lockout accessories

    B trip curve 1 to 63 amps C trip curve 0.5 to 63 amps D trip curve 0.5 to 40 amps

    Bryant ManualMotor Controllersstarting at $23.50

    Lockout / Tagout capability 30, 40 and 60A up to 600 VAC 2-pole and 3-pole switches Quick make, slow break design UL Listed as Suitable as Motor Disconnect under UL 508

    UL 508Load Switchesstarting at $26

    35mm DIN rail mountable or direct mountable Loads from 16 to 125 amps IP20 degree of protection

    UL 98 and UL 508Compact FusibleDisconnect Switchesstarting at $19.50

    Up to 30A, utilizing Class CC or Midget fuses 1, 2 and 3-pole models Open fuse indication Lockout/Tagout capability

    UL 489MCCBsstarting at $182

    Rated current up to 800A, max 600V Standard and high-interrupting capacity types

    UL 489 MiniatureCircuit Breakers,up to 40Astarting at $18.00

    DIN-rail mounted Up to 40 amps 1, 2, or 3-pole available 10kAIC @ 277/480VAC

    UL 98DisconnectSwitchesstarting at $88

    Non-fusible and fusible rotary disconnect switches Make/break loads up to 800 amps

    UL 248 Current Limiting Fusesstarting at $7.75(Class T 1-pack)

    Class T, RK5, RK1 and Class J current limiting short circuit protection up to 600A Sold in packs of 1, 5 or

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  • September 2015 DESIGN WORLD 2 7

    WHITTET-HIGGINS manufactures quality oriented, stocks abundantly and delivers quickly the best quality and largest array of adjustable, heavy thrust bearing, and torque load carrying retaining devices for bearing, power transmission and other industrial assemblies; and specialized tools for their careful assembly.

    Visit our websitewhittet-higgins.comto peruse the many possibilities to improve your assemblies. Much technical detail delineated as well as 2D and 3D CAD models for engineering assistance. Call your local or a good distributor.

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    High power RD devices solve TWT radar issuesTwo gallium nitride (GaN) high electron mobility transistors (HEMT) promise to solve several long-standing issues for radar systems using traditional travelling wave tube (TWT) amplifiers. GaN-based solid-state amplifiers operating at 50 V are not prone to the failures seen with high voltage (kV) TWT power supplies, and thus have longer lifetimes. Also, these transisters have near instant on capabilitywith no warm upand have longer detection ranges and improved target discrimination. Conceived to enable these benefits, these two GaN RF transistors were engineered to deliver high power and efficiency in a small package size. The first device, a 350-W/50- fully matched GaN HEMT is the highest power C-Band transistor available on the market. The second, a 500-W/50- GaN HEMT, is the highest power S-Band transistor fully matched to 50 in a single-ended package of its size. According to the manufacturer, the C- and S-Band products break power records for GaN power and efficiency performance housed in a small 50- package. This efficient power enables the economical combination of transistors to achieve multi-kilowatt power amplifiers required for defense, weather and air traffic control radar. Offering pulsed saturated power performance typically greater than 400 W, the CGHV59350 is most often used in ground-based defense and Doppler weather radar systems. The 50-, fully matched GaN HEMT operates over a 5.2 to 5.9 GHz bandwidth, exhibits 60% typical drain efficiency, and is packaged in an industry standard 0.7 x 0.9 in. ceramic/metal flange package. Delivering 700 W of typical saturated RF pulsed power, the CGHV31500F is offered for air traffic control radar systems. The 50-, fully matched GaN HEMT operates over a 2.7 to 3.1 GHz bandwidth, exhibits 12 dB power gain, and is packaged in an industry standard 0.7 x 0.9 in. ceramic/metal flange package. DW

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    DFI 9-15_Vs6.LL.MD.indd 27 9/2/15 1:14 PM

  • The engineers at Technowrapp had an idea that, if successfully executed, would result in the worlds fastest arm pallet wrapper. But they also wanted to ensure their Runner Arm would be simple to operate and easy to maintain. In the Runner Arm automatic rotary arm pallet wrapper, the engineers created a device that can wrap 136 pallets/hour with 10 turns per pallet, stabilizing a pallet with just 76 g of stretch wrap film (value achieved with 15 m film). The rotary arm with centripetal contrast ring contains and guides the arm as it moves and makes it possible to reach 45 rpm, combining this with low structural stress. The cutting and welding pliers operate on the moving load, contributing to the increase in speed and efficiency of the work cycle.

    2 8 DESIGN WORLD September 2015 www.designworldonline.com

    03 D e s i g n f o r I n d u s t r y p a c k a g i n gMotors key to fast arm pallet wrapper

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  • BOSTON GEAR Original Domed Crown Stainless Steel 700 Series Reducer

    Altra Industrial Motion

    Vol. 4 | No. 3 | 2015

    The Power Brands in Power TransmissionPower Review

    Altra Industrial Motion The Power Of Experience

    Ameridrives Couplings

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    Bauer Gear Motor

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    Boston Gear

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    Kilian Manufacturing

    Lamiflex Couplings

    Marland Clutch

    Matrix International

    Nuttall Gear

    Stieber Clutch

    Svendborg Brakes

    TB Woods

    Twiflex Limited

    Warner Electric

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    Wichita Clutch

    For more information contact us at: [email protected] or visit www.altramotion.com

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    Find Altra Industrial Motion on:

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    Boston Gear Original Domed Crown Stainless Steel Reducer

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    Altra Industrial_#1_9-15.indd 29 9/2/15 3:50 PM

  • Boston Gear Original Domed Crown Stainless Steel 700 Series

    The Boston Gear 700 Series Worm Gear Speed Reducer has been a foundation in food and beverage applications for decades. As a leader in worm gear technology, Boston Gear continues to improve product performance by developing innovative designs to meet more stringent demands and anticipated tightening of federal regulations in the food and beverage industry.

    Utilizing the often imitated but never equaled 700 series worm gearing combined with new exterior designs, the new stainless steel 700 series performance has been optimized to withstand the harshest washdown conditions! The new line incorporates features that were designed with the input of some of the food processing industries leading players to maintain optimal performance in the toughest caustic environments.

    The Stainless Speed Reducer is NSF International certified and the Stainless Gearmotor is UL / ULc Certified.

    For more information download P-1998-BG & P-7756-BG from www.AltraLiterature.com or visit www.BostonGear.com

    Laser marked nameplate provides worry-free part identification while maintaining a smooth, unetched surface. Rounded housing prevents foreign matter adherence and fluid accumulation.

    Boston Gear Stainless Gear Drives Enhance Food SafetyThe Clean Product Advantage

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    Process improvements have yielded the BEST standard leadtime for stainless worm gear reducers.

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    Send Formsprag your old clutches to make them like new again. The difference is not just cosmetic.

    All internal components sprags, energized springs, retainer, bearings, seal and hardware are refurbished or replaced to new performance standards. The inner and outer races are ground to specifications noted below so that no wear patterns remain.

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    Consider these advantages:

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    frame- Warranty 1 year on labor and materials, same as new clutches- Emergency Breakdown Program All products that are air freighted into the

    Warren plant are processed immediately and, in most cases, are able to be rebuilt within a 24-hour period.

    For more information download Application Guide P-1465-FC from www.AltraLiterature.com

    Formsprag Rebuild and Overhaul Service

    Altra Industrial_#2_9-15.indd 30 9/2/15 3:51 PM

  • Proven Oldham Couplings 25% Higher Torque

    Warner Linear has expanded the S-Track linear actuator product line with the addition of a new programmable model.

    An easy-to-use integrated keypad allows operators to set and reset end of travel positions as well as two intermediate stops.

    New S-Track electric actuators are designed for better control and quieter operation in general duty applications including medical, industrial, turf & garden and recreational vehicles.

    For more information download catalog P-1581-WL from www.AltraLiterature.com or visit www.WarnerLinear.com

    Programmable S-Track Linear ActuatorJust introduced, the Oldham lateral offset couplings are designed to handle 25% higher torque than their forerunners.

    Previously, a peak torque rating of 44Nm was the highest available. Now, 55.36Nm is possible using a specially designed larger diameter disc.

    The Oldham is precision engineered throughout and comprises two hubs with inward facing tenons. These engage with matching slots spaced at 90 in a central lightweight torque disc. A hard, low friction facing on the working surface guarantees long, trouble-free operation.

    Typical applications range from the incremental control of fluid valves to positional systems in machinery, robots and slide tables. They can also be applied to microstepper and closed loop servo systems and, to a lesser extent, half and full step motor drives.

    Twiflex USA Brake Calipers

    Sure-Flex Plus: A New Standard for Performance

    Twiflex offers the largest range of industrial disc brake calipers in the world. Spring applied units may be retracted pneumatically, hydraulically or electrically (depending on caliper design) while most direct acting brakes have some form of positive retraction device.

    Pneumatically Applied Brakes are best suited for light to medium stopping duties and for tensioning applications where a high degree of control is required.

    Hydraulically Applied Brakes address higher torque requirements, while spring applied calipers are essential where braking must be maintained in the event of supply system failure

    Mechanically Applied Units are suitable for light tensioning duties or where no external power is available; they may also be specified when designers wish to use their own means of actuation.

    For more information download P-1648-TF from www.AltraLiterature.com

    For over 50 years, TB Woods has led the coupling industry with the original TB Woods Sure-Flex design. And we havent stopped innovating: this industry favorite just got even better.

    Our new Sure-Flex Plus EPDM and Neoprene sleeves are best-in-class for coupling performance and value. Heres why:

    High Torque Rating30% Increased Torque RatingProvides longer service life in demanding applications, reducing required maintenance and associated replacement cost.

    Longer LifeSure-Flex Plus Lasts Over 3X Longer than the CompetitionExtensive testing shows our sleeves outlast the imitators. More uptime means less costly downtime.

    Better ValueSave Money Using a Smaller CouplingThe increased rating of the Sure-Flex Plus sleeves lets the user choose a one-size-smaller coupling for over 50% of common applications. This lowers the cost of both initial purchase and future sleeve replacement.

    InterchangeableRetrofits to Existing FlangesNo need to replace the full coupling The Sure-Flex Plus sleeve design is 100% compatible with the current industry standard that TB Woods created over 50 years ago.

    Call Twiflex Toll-Free: 844.723.3483

    For more information download P-7819-TBW from www.AltraLiterature.comor visit www.TBWoods.com

    TB Woods Incorporated

    Altra Industrial_#3_9-15.indd 31 9/2/15 3:53 PM

  • Altra Electric Clutch Brake brands offer the largest selection of clutches, brakes and linear actuators available from a single source...worldwide.

    Warner Electric, Matrix International, Warner Linear and Inertia Dynamics have over 60 years combined experience designing and manufacturing technically-advanced, cost-effective braking and positioning systems. State-of-the-art Altra clutch and brake solutions are utilized on drivetrains in an array of global markets including material handling, packaging machinery, food & beverage, elevator & escalator, turf & garden, agriculture and off-highway, forklift and medical.

    www.AltraMotion.com

    Warner Electric www.warnerelectric.com

    Matrix International www.matrix-international.com

    Inertia Dynamics www.idicb.com

    Warner Linear www.warnerlinear.com

    Altra Industrial_#4_9-15.indd 32 9/2/15 3:54 PM

  • September 2015 DESIGN WORLD 3 3

    To achieve these speeds, the engineers used Bonfigliolis C, W, and BE/BN motor series for the pallet and vertical carriage movement as well as the ring rotation and the servo-assisted tensioning systems. The motors were used for the tensioning, feeder, and plier carriages, as well as for the presser and linear roller. The carriage system is equipped with Bonfigliolis W63 and BN_FD Motors with a motor power of 0.75 kW. In addition, the tensioning and plier carriage are also equipped with W63 and BN_FD Motors, with motor powers of 0.55 kW for the tensioning carriage and 0.37 kW for the plier carriage; the tensioning carriage also uses a W86/BE motor with a motor power of 1.1 kW.

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    p a c k a g i n g

    The arm rotation uses Bonfigliolis W110/BN_FD motor series with 4 kW of motor while the presser uses a W63 BN_FD motor with 0.55 kW of motor power. The linear roller uses the C22 BE series with 0.75 kW of power. These various motor solutions have helped the Runner Arm achieve high speeds while maintaining low structural stress. DW

    Bonfigliolibonfiglioli.com

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    Gearmotors deliver efficiency in packaging applications

    3 4 DESIGN WORLD September 2015 www.designworldonline.com

    In packaging, the demand for smaller, lighter, reliable and energy-efficient power transmission components is constant. A new entrant into the efficient power transmission market is the ie3 premium efficiency gearmotors, which offer increased efficiency over standard IE1 models throughout the speed range and initiate less mechanical stress, which directly translates into long-term energy savings. The ie3 gearmotors run cooler and with less noise and, as they are sealed for life and require practically no maintenance, significantly reduce costly downtime. Two key factors enhance the durability of these gearmotors: ultra-long-lasting e-coat paint and lubrication through premium H1 food-grade grease.

    Key attributes of these gearmotors include: light, reliable and compact in size high torque at low speed sealed for life for maximum efficiency and reduced labor standard high-grade grease for lifetime lubrication and reduced maintenance/downtime high-quality, durable, e-coat paint to withstand the toughest environments hypoid gearing for efficiency DW

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    04 p a c k a g i n g D e s i g n f o r I n d u s t r y

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    www.designworldonline.com September 2015 DESIGN

    e n e r g y

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    D e s i g n f o r I n d u s t r y 04 e n e r g y

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    Personal CNC

    Prototyping - Product Design - R&D - Engineering

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    Eisertech, a medical device company in San Diego, CA, designs and manufactures spinal implants and surgical instruments with the help of their Tormach PCNC 1100. What started out as garage shop prototypes has grown into a successful medical device product line.

    To read more about this story, and to see what others are doing with their PCNC mills, visit www.tormach.com/design.

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  • By using various machines and a PCNC 1100 mill from Tormach, the NASA team can quickly prototype and develop different versions of unique components. Were making parts for flight projects, high-altitude balloons, and prototyping things for an eventual satellite mission, said Alan Kogut.

    4 0 DESIGN WORLD September 2015 www.designworldonline.com

    Mike Santora Associate Editor D e s i g n N o te s

    Both the costs and risks of spaceflight are always high. So what do you do when you dont have the time, budget and room

    for error to outsource the machining of ever-evolving prototypes?

    NASA Goddard Spaceflight Center uses an array of manufacturing

    and engineering tools to develop their one-off, highly customized

    technologies. In fact, they use a shop that is connected to their

    labs, which houses an array of manual milling, CNC and production

    machines.

    According to Alan Kogut, an astrophysicist at the center, without

    their attached shop they would be relegated to outsourcing the

    creation of various components and instruments. By using various

    manual machines and a PCNC 1100 mill from Tormach, the team

    can quickly prototype and develop different iterations of unique

    components. Were making parts for flight projects, high-altitude

    balloons, and prototyping things for an eventual satellite mission,

    he said.

    Personal CNC mill helps NASA boldly go...

    The Goddard Spaceflight Center is producing projects like PIPER

    (the Primordial Inflation Polarization Explorer) to measure the linear

    polarization of the cosmic microwave background. The satellite

    instrument looks for the signal from primordial gravity waves excited

    during an inflationary epoch shortly after the Big Bang.

    They fly these telescopes in containers of liquid helium, which

    keeps the temperatures near absolute zero (about 1.5 K). The cold

    temperatures keep the telescopes heat radiation from interfering

    with the radiation the researchers are trying to see, which is limited

    to a few parts per billion.

    For PIPERs precision sensors and instrumentation to operate

    correctly at such low temperatures, the team needs to compensate

    for differential contraction of components in their designs. Brackets

    and fixtures holding sensitive instruments for getting data back

    to Earth are housed in these icy temperatures. If the differential

    contraction is not compensated for in the design, signals and

    Design Notes 9-15_Vs6.LL.MD.indd 40 9/2/15 1:32 PM

  • September 2015 DESIGN WORLD 41

    measurements could be lost in the vastness of outer space. This is

    where its advantageous to have a machine shop so closefaster,

    less expensive prototypes and flight-ready final components.

    The teams at Goddard have also customized their Tormach mill

    with a unique fixture for wire-winding. According to Kogut, they have

    to wrap a couple miles of thin wireabout 13 as thick as a human

    hairin an extremely uniform manner for the satellites. You take

    a couple miles of this wire and you wrap it around to make a whole

    bunch of parallel strands over large distances, he said. This creates a

    grid that is about 2 ft across.

    The strands have to be held to a plane so they form a flat surface

    (to a few millionths of a meter) and the wires have to be spaced

    accurately to about 4 or 5 m, which is where the need for CNC comes

    into play. We are able to use the mill to both cut the fixture that the

    wires get wound onto, and then use it to put the wires in place, said

    Kogut.

    Using a high-accuracy CNC machine is vital to the proper operation

    of a component like this. As the maker movement has emerged,

    both manual and automated machines have become more

    The teams at Goddard hav

    e

    customized their Tormach m

    ill with

    a unique fixture for wire-wind

    ing.

    The PIPER (the Primordial Inflation

    Polarization

    Explorer), measures the linear polariz

    ation of the

    cosmic microwave background. The s

    atellite instru-

    ment looks for the signal from primo

    rdial gravity

    waves excited shortly after the Big B

    ang.

    They fly these telescopes in contain

    ers of liquid

    helium, keeping the temperatures ne

    ar absolute

    zero (about 1.5 K). The cold keeps th

    e telescopes

    heat radiation from interfering with th

    e radiation

    the researchers are trying to see, whic

    h is limited to

    a few parts per billion.

    Design Notes 9-15_Vs6.LL.MD.indd 41 9/3/15 4:49 PM

  • D e s i g n N o te s

    4 2 DESIGN WORLD September 2015 www.designworldonline.com

    readily available and less expensive. It has also

    ushered in prosumer-style machines, which

    are capable of production-quality work, but

    available on a budget and in a footprint that

    small businesses and consumers can handle.

    NASA has been able to circumvent traditional

    manufacturing within this facility, allowing

    them to prototype, produce and innovate faster

    and on a tighter budget.

    These projects are not high-budget

    projects, but they still involve a lot of parts that

    are sort of custom-made to fit, Kogut said.

    Rather than going to all the trouble of figuring

    out exactly what we want, making up shop

    drawings, sending it out to a shop, getting a

    quote, and then getting the part produced, we

    decided to just get our own machine that we

    could make our own brackets and fixtures with

    a much faster turnaround.

    Though they dont use many exotic

    materialsmostly aluminum, stainless steel,

    copper and the occasional block of titanium

    NASA has to keep their tolerances tight and

    their budgets even tighter. DW

    Tormachtormach.com

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    Design Notes 9-15_Vs6.LL.MD.indd 42 9/2/15 1:33 PM

  • The Minus K BM-8 negati

    ve-

    stiffness vibration isolator

    provides

    0.5 Hz isolation performance

    vertical,

    and 0.5 Hz horizontal, using

    a totally

    passive mechanical system

    no air or

    electricity required.

    September 2015 DESIGN WORLD 43

    Negative-stiffness isolators a plus for CMM system

    Manufacturers need to control processes to produce a consistent, reliable product. Where precision surface engineering is

    required, surface measurement is a key part of maintaining control

    of the process.

    Laser interferometers are widely used in industry for the

    measurement of small displacements, refractive index changes

    and surface irregularities. When built into inspection equipment,

    like a coordinate measuring machine (CMM), a laser interferometer

    system reports the surface condition of a product with more

    accuracy than any other method. These CMM laser interferometry

    surface measurement systems, however, can be negatively

    affected by plant low-frequency vibrations, which can distort the

    interferometry measurements and deliver inaccurate readings.

    One specific CMM system, designed and manufactured by

    Arnold Gauge Company, has directly addressed the vibration

    issue. The companys CMM system maintains its throughput

    by integrating a compact negative-stiffness vibration isolation

    platform.

    Every second, the laser in the CMM is generating about 2,000

    readings, said Michael Bruins, president of Arnold Gauge Company.

    These readings, taken at the micron level, are displayed on a chart

    and plotted against the pre-engineered ideal surface. Due to these

    Edited by: Mike Santora Associate Editor

    Top Plate

    Transmissibility for negative-stiffness isolator versus an air table

    Upper Column PlateVertical

    Negative-StiffnessFlexures

    Rigid Support

    Beam-Column

    Support Tube (Threaded)

    BaseLeveling Screw

    D e s i g n N o te s

    Schematic of negative-stiffness isolator

    Design Notes 9-15_Vs6.LL.MD.indd 43 9/2/15 1:34 PM

  • D e s i g n N o te s

    micro-tolerances, any vibrations on the plant

    floor, such as from forklifts, are g