FOCUS on ENERGYWILL NATURAL GAS POWER OUR CARS AND TRUCKS?, page 40 HOW TO MAKE PNEUMATICS MORE ENERGY EFFICIENT, page 44 ULTRACAPACITORS HOP UP MICROHYBRIDS,... Getting energy savings
Trang 1FOCUS on ENERGY
WILL NATURAL GAS POWER OUR CARS AND TRUCKS?, page 40
HOW TO MAKE
PNEUMATICS
MORE ENERGY EFFICIENT, page 44
ULTRACAPACITORS
HOP UP MICROHYBRIDS,
Trang 2Its keyless hollow shaft and taper
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Trang 4ENERGY EFFICIENCY
There are three basic ways
to boost the efficiency of industrial pneumatics.
Industrial machines and production systems that are designed to run efficiently and save energy are undoubt- edly important considerations in manufacturing today
increasing awareness of the environmental impact on an organization’s sustainability.
All of these issues should not simply be the ity of production-floor personnel Machine and system designers and financial managers of industrial and manu- facturing corporations have a stake in this as well.
responsibil-With pneumatic systems, there are basically three ferent ways to approach energy savings: leak detection, look at each.
dif-Leak detection
A good leakage-management program is essential It radically lowers compressed-air consumption and the as- sociated costs as leaks are a waste of compressed air, which create pressure losses that can significantly slow produc- tion processes and prevent machines from running at peak capacity.
A study by the Fraunhofer Institute in Germany
looked at compressed-air systems in the European Union and concluded that 42% of the total potential savings implementing a solid leak-detection program The objective should be to completely check the pneumatic system from the compressor (supply side) to each machine simple ultrasonic leak detector can help manually iden- tify individual leaks on machines — usually for an entire
The energy-efficient OVEM vacuum generator has an integrated filter and the status of the vacuum system.
ENERGY EFFICIENCY
Americans spend about $260 billion each year on oil from outside of NAFTA
for transportation This transfer of capital to other countries increases our remain mobile, keep the environment clean, and provide trillions of dollars over the next half century for developing alternative energy and transporta- tion options for the long-term future.
What the U S needs
In terms of energy, the U. S gets about 14.78 quads (10 15 Btu) for its $260 lion A trillion ft 3 (Tcf) of natural gas contains approximately one quad So 14.78 quads used for transportation per year can be replaced with 14.78 Tcf of natural
bil-The technology and gas is readily available And it could save the U S over
$200 billion annually.
Authored by:
Dick Medvick
Contributing Editor Cleveland, Ohio Edited by Stephen J Mraz stephen.mraz@penton.com For more on natural-gas vehicles, scan this
code or go to: http://
for-natural-gas- vehicles-0810
article/uneven-prospects-And natural gas in its liquid form (LNG) is already becoming popular for long-haul trucking It costs about can lead to significant savings for truckers routinely buy- ing 20,000 gallons of diesel fuel annually.
In fact, several truck and engine manufacturers offer
LNG models, including Cummins-Westport, Kenworth,
PACCAR-owned Peterbilt, Navistar, Freightliner, and
Caterpillar. LNG trucks still cost more, but as more els are available, costs are coming down to the point many savings on fuel.
mod-But there are problems with NGVs: Customers won’t buy them because there aren’t enough natural-gas filling stations and companies won’t install filling stations be- cause there are not enough NGVs on the road For truckers, this chicken-and-egg dilemma is being
partly solved by an agreement between Clean Energy
Fuels , a national natural gas supplier, and Pilot/Flying J
truck stops They plan to install refueling pumps at 150 make it possible for an LNG truck to travel coast to coast and border to border — anywhere a diesel rig can go For consumer cars and trucks, the solution to the filling- station problem might be in the hands of the auto compa- nies They could design and sell bifuel vehicles, which run
gas That might seem like a lot of natural gas, but last year has at least 2,170 Tcf.
America currently uses 23.37 quads from natural gas each year for residential, commercial, transportation, and electricity Adding another 14.78 quads for transporta- tion would push the total use to 38.15 quads per year, or has at least another 780 Tcf of natural gas, the equivalent American consumers $20 trillion ($260 billion annually and transportation.
Current NGV
CSA America, the organization that writes standards for gas appliances and accessories and alternative-energy natural-gas vehicles (NGV) and filling stations The de- sign work is done, and NGVs are in dealers’ showrooms
Honda, for example, sells NGVs which store natural gas at 3,600 psig Other automobile manufacturers could quickly follow suit.
Should the U S switch to
natural gas for
transportation?
Chrysler had already adapted several of its vehicles, including the Ram truck, to bifuel technology, letting them run on natural gas or gasoline Such vehicles could help make the transition to vehicles predominantly
Honda leases its powered FCX Clarity in California Here is one at a hydrogen refueling station from a pipeline.
hydrogen-Standards are already in place to govern the safe operation of natural-gas fuel stations, like this one.
AUGUST 9, 2012 MACHINE DESIGN.com
Access our Reader Service Web site to quickly find and request information on the products and services found
in the pages of M ACHINE D ESIGN
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44
40 40
Rocket, an electric dragster, set
the quarter-mile record not only
for electric motorcycles, but for all
electric vehicles
Should the U S switch
to natural gas for
transportation?
Switching to natural gas could end
U. S dependence on foreign oil for its
transportation needs
Getting energy savings
from pneumatic systems
There are three basic ways to
boost the efficiency of industrial
pneumatics
Put a cap in it!
The rapid charge and discharge
ability of ultracapacitors opens a
myriad of uses for quick and
clean-energy-storage needs
VOLUME 84ISSUE 11AUGUST 9, 2012
AUGUST 9, 2012 MACHINE DESIGN.com
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Trang 5Bryant Watertight Wiring Devices
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Corrosion-resistant nickel plated blades and stainless steel captive assembly screws
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Thermoplastic elastomer housing
Double insulated elastomeric cover and thermoplastic body for extra safety and water resistance
Closure cap seals out water and dirt when not in use
Strain relief compression cord seal with neoprene bushing
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RS# 103
Trang 6Editorial content is indexed in the Applied Science Technology Index, the Engineering Index, SciSearch and Research Alert Microfilm copies available from National Archive Publishing Company (NAPC), 300
N Zeeb Rd., P.O Box 998, Ann Arbor, MI 48106-0998, Ph: 734-302-6500 or 800-420-NAPC (6272), extension 6578.
Permission to photocopy is granted for users registered with the Copyright Clearance Center (CCC) Inc to photocopy any article, with the exception of those for which separate ownership is indicated on the first page of the article, provided that the base fee
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Printed in U.S.A., Copyright © 2012 Penton Media, Inc All rights reserved M ACHINE D ESIGN (ISSN 0024-9114)
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in January, February, June, July, and December by Penton Media, Inc., 9800 Metcalf Ave., Overland Park,
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Paid subscriptions include issues 1-18 Issue No 19 (OEM Handbook and Supplier Directory) is available at additional cost Rates: U.S.: one year, $139; two years,
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$119; All other countries: one year, $99; two years,
SCANNING FOR IDEAS
Rotary actuator increases speed, rotation, and response while
4
Trang 7Most axial fans of the “compact class” use the old shaded-pole motor AC technology, despite its poor efficiency compared to DC technology The barrier to improvement was that DC technology couldn’t be operated directly from the AC mains supply A solution is now available with i-Maxx technology from ebm-papst The i-Maxx retains the mounting dimensions of the equivalent AC fans and is capable of operating on AC mains power around the world There is no simpler way
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RS# 104
Trang 8Hennepin Technical College is teaching students about
fluid-power technology and making it fun, too An instructor shows off a go-cart powered by fist-sized, 5-hp hydraulic motors that eliminate gears, clutches, chains, and belts He also discusses
a mobile picnic table with a hydrostatic drive, a hydraulic
motorcycle, and a pneumatic lawnmower View the episode at
www.engineeringtv.com/video/
Flui;Fluid-Power-Conference-Expo-201.
Hydraulic-Fun-and-Teaching-FREE WEBCAST: APPLYING STEPPER MOTORS
Thursday, August 9, 11:00 ET
This Webinar, presented by ElectroCraft, will review basic parameters
necessary to properly select and apply stepper motors to motion applications
The discussion will review stepper speed-torque behavior, thermal ratings,
engineering calculations, and how windings impact dynamic behavior Other
topics will include considerations for intermittent-duty operation, motor/system
accuracy, failure modes, and how to apply these criteria to stepper-based linear
actuators Learn more and register at http://tinyurl.com/d9bfkk9.
FREE WEBINARS ON SENSORS, PROCESS CONTROL AND MORE
Take 30 to 45 min and watch free Webinars on industrial controls topics Whether live or prerecorded, see equipment in action and gain some insight
SENSORS
This short, 30-min session will review all types of sensors, including: photo, proximity, fiber optic, magnetic, capacitive, ultrasonic, light curtains, and more We will cover real-world applications and take live questions
August 15, 2012, 2:00 p. m ET
PROCESS CONTROL
This prerecorded 40-min presentation discusses process control, and the products that are useful in those applications Learn about devices that can sense temperature and pressure; control devices such
as temperature controllers and PLCs that accomplish PID control; signal conditioning; and timer relays that are useful in this area of automation control
PNEUMATICS
This prerecorded 40-min session covers the NITRA pneumatic product family The line now includes stainless-steel cylinders, filters, regulators, lubricators, solenoid valves, position switches, tubing, and fittings See working demos and customer examples
Visit www.automationtalk.com to
check the schedule and register for upcoming presentations, or view the prerecorded Webinars on demand
Power-transmission site
U. S Tsubaki has launched a new
Web site (http://ustsubaki.com) on its
roller chains, motion-control
com-ponents, sprockets, and other
prod-ucts for the energy, mining,
food-processing, forestry, packaging, and
conveyor markets Content includes
detailed specs and images, videos,
and a library of 2D and 3D CAD
drawings Users can compare similar
products by characteristics such as
dimensions, materials, and specific
features And an online configurator
lets users create complex drawings
on demand.
Wireless Web site
The new Linx Technologies Web
site (www.linxtechnologies.com)
covers wireless products such as RF
modules, remote controls, antennas,
connectors, and development kits
Content includes specs,
documenta-tion, application notes, and FAQs
on FCC certification Users can also
download software and drivers and
get tech support.
Site transforms
hobbies into cash
Jameco Electronics has introduced
its new Club Jameco Web site (www.
ClubJameco.com), where electronics
do-it-yourselfers can design kits for
hobbyists and earn royalties The site
lets designers create an electronics
project by identifying components,
writing step-by-step instructions, and selling the creation as an electron- ics kit A “crowd-source” feature lets members comment and contribute
to the project while it is being signed Projects will be sourced, built, promoted, and sold without any cost
de-or risk to the designer Club Jameco also lets electronics enthusiasts dis- cover, discuss, develop, and purchase electronics kits.
Enclosures catalogThe new North American Edition of
Rittal Corp.’s product catalog is
avail-able in electronic or print versions
Nearly 900-pages long, it covers the company’s IT and industrial prod- ucts from large security enclosures and mobile data centers to junction boxes, stainless-steel enclosures, and the nuts and bolts required to assemble accessories Get a copy at
www.rittal-corp.com/literature.
Sensors site
Balluff has launched a new Web
site on the company’s inductive, photoelectric, vision, capacitive and magnetic sensors, as well as linear- position transducers, RFID systems, and networking products The site includes product data sheets, sup- port material, and literature Product selectors let users apply physical, en- vironmental, electrical, and special- duty attributes to identify the most- suitable product for a design Learn
more at www.balluff-usa.com.
AUGUST 9, 2012 MACHINE DESIGN.com
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Trang 9www.rexnord.com
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RS# 106
Trang 10we were intrigued by recent work from psychologists who found that many people make decisions about technology using emotions and mental short-cuts Interestingly, people doing this generally don’t recognize their thought process isn’t strictly rational.
The research results ring true partly because researchers stayed away from politically charged technologies such as energy Headed up by University of Oregon psychology Professor Paul Slovic and East-West Center Senior Fellow Melissa Finucane, the research group surveyed people’s opinions about vari-ous topics such as water fluoridation, cars, and food preservatives They asked subjects in the study to list both the benefits and risks of each technology.All in all, the researchers found people based their judgment about a technology on their feelings for it People rated those they liked as having large benefits with little risk When commenting on technologies they didn’t like, they could only think of disadvantages; few strong points came to their minds
It wasn’t just the uninformed public who were prone to such white assessments Professionals making judgments in their field fell victim
black-and-to them as well In one case, members of the British Toxicology Society found few benefits in substances they thought were risky, few problems with those they liked
There was a second part to Slovic and Finucane’s study Their group had respondents read brief arguments in favor of various technologies they’d just opined on Some of the arguments focused on the benefits of a technology, others stressed low risks
These short passages turned out to be effective at changing the emotional appeal of the technologies People who read about the benefits of a technol-ogy also changed their mind about its risks; they perceived it as being less risky A point to note is that the passage they’d read mentioned nothing at all about risks In a similar vein, people only told that the risks of a technology were mild started to look at its benefits in a more favorable light
The way we feel about something also tends to make us ignore statistics even when we understand their implication Researchers say our responses
to uncertain situations appear to have an all-or-none quality that is sensitive
to the possibility rather than the probability of strong positive or negative consequences So events with very small probabilities carry great weight with most people
This, they argue, helps explains the impact of big headlines about hazards such as nuclear power and exposure to extremely small amounts of toxic chemicals, despite widely available information about the small probabilities
of their feared consequences
It is not difficult to see how these conclusions pertain to the shrill public debates surrounding energy policy People who have pet energy technolo-gies don’t have to face painful trade-offs that are built into embracing them Technologies we favor are likely to have few costs Less favored technologies are all bad
In this ideal world, decisions are easy
— Leland Teschler, Editor
RS# 107
AUGUST 9, 2012 MACHINE DESIGN.com
8
Trang 11Configure and order hundreds of FRLs — plus thousands of other products — shipped in 3 days or less
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RS# 108
Trang 12EDITORIAL STAFF
1300 E 9th St Cleveland, OH 44114-1503
EDITOR
Leland E Teschler leland.teschler@penton.com
MANAGING EDITOR
Kenneth J Korane ken.korane@penton.com
SENIOR EDITORS
Leslie Gordon leslie.gordon@penton.com Stephen J Mraz stephen.mraz@penton.com
ASSOCIATE EDITORS
Lindsey Frick lindsey.frick@penton.com Robert J Repas, Jr.
robert.repas@penton.com
INDUSTRY COVERAGE: AUTOMOTIVE, PACKAGING,
EDITORIAL PRODUCTION
Denise Greco Editorial Production Manager Randall L Rubenking Art Director
RS# 110 RS# 109
AUGUST 9, 2012 MACHINE DESIGN.com
10
Trang 13For more information contact Ellen Girard, LUBRIPLATE’s
Food Grade & General Industrial
Lubriplate’s Extended Life Air Compressor Fluids Include
Trang 14problems if they knew there was
a decent job waiting for them
For example, my parents saw the horrors of World War II, but there was tremendous economic op-portunity in the 50s and 60s and they quickly became optimistic,
at least about their own futures
I feel that prosperity has been redistributed too much toward the top 1% That redistribution was masked for a while by climb-ing debt, but now that bubble has burst That’s the problem
Steve Oberheim
Lack of experience in engineering college
With over 27 years of engineering experience, I’m still amazed at the lack of practical design knowledge being taught
design-— even in the neering departments of major universities (“Working with Di-mensional Tolerances,” May 10) It appears that most professors un-derstand the math and science involved in engineering, as that
mechanical-engi-is what they can test, but they are clueless when it comes to practi-cal design methods
During the last several years,
I ’ v e o b s e r v e d h o w s e v e r a l younger mechanical engineers have approached the machinists
in our model shop Some told the machinists: “Just do it the
The bright side of
pessimism
“Kennedy asked his fellow
Ameri-cans to join him in a quest to
end pover ty, disease, tyranny,
and war.” (“A Generation of
Pes-simists,” June 6)
Asking someone to join in a
quest does not mean the goal
is attainable Nor does it mean
that because the goal is
unat-tainable, one should not try to
achieve it It is not pessimistic to
believe that these goals are
unat-tainable, merely realistic Given
that human nature is involved,
it is likely impossible to end all
these things
Mike Stoneberg
Maybe the reason the younger
generation of students is
pes-simistic about the future is that
they have a real understanding
of the reasons behind global
warming and are all too often
faced with people who call them
“environmental extremists.”
Engineers should be working
towards solving the real problem
of global warming They should
be pushing for energy
conserva-tion and designing vehicles that
reduce CO2 emissions
Too often the youth of our
na-tion are faced with people such
as yourself who are standing in
their way
That’s a real cause of pessimism
Ed Malec
Per haps today ’s students are
more obser vant than Horgan
gives them credit for Perhaps
they are aware of the “success” of
the various War on Poverty
pro-grams over the past half century,
which demonstrate the inability
of the government to solve or
cure poverty
William Kelly
The job prospects for many college
students are terrible, while their
debt levels are astronomical
These students could probably
live with any of the world’s other
way I’ve designed it.” The result: parts that don’t fit, lots of rework, too much scrap, and a myriad of other issues that could have been avoided had the engineer only spent a little time learning how
to interact with the shop nel These guys can — and will
person-— be the friend of any engineer who treats them with respect In-sulting the shop personnel just cuts off the communication you need to understand how to redi-mension the part, or tweak the design for manufacturability — crucial items, if you want to move your career forward
Tim K Ries
This article makes it sound as if dimensional tolerances are op-tional Not so Every dimension on
a drawing must have an associated tolerance, whether specific to that dimension, or covered by general tolerances in the title block Lack
of a tolerance precludes your ity to reject parts made to dimen-sions you can’t use
abil-This is usually covered in gineering Drawing 101 The fact
En-t h a En-t m a n y e n g i n e e r s d o n o En-t understand this is indicative of many of the problems we face today in manufacturing
be pessimistic, especially when it comes to the gov-ernment’s ability to help anyone They also seem pes-simistic about geometrical dimensioning and toleranc-ing, an art or science few en-gineers have mastered
AUGUST 9, 2012 MACHINE DESIGN.com
12
Trang 15All the Tools you Need for Embedded
Measurements and Control,
in one rugged box.
The NI CompactRIO hardware platform can handle your embedded measurement and control applications, and do it in a way that outperforms other off-the-shelf systems so you don’t have to spend time developing a custom solution The range
of high-quality measurements, coupled with an extremely rugged design and the ability to modify the hardware using NI LabVIEW system design software, gives you all the benefits of customization with the convenience of an off-the-shelf platform.
©2012 National Instruments All rights reserved CompactRIO, LabVIEW, National Instruments, NI, and ni.com are trademarks of National Instruments
RS# 112
Trang 16Download EMI/RFI Shielding Product Catalog at
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-Even Britannica succumbed They pushed out fundamental reference data, their supposed bread and butter, to make room for the “news.” The CRC handbook took this same misguided route.They are all becoming tweets rather than tools
All these companies left out the first step in systems engineering when “improving” their software: Assemble the stakeholders, espe-cially the users, and find out how they really use the tools
William Elrod
to know that I drew a car toon expressing my general skepti-cism about the concept I titled
it the Horizontally Oriented Wind Generator, Jet stream Oriented, With Lifting Surfaces It was to
be known by its acronym: HOWG JOWLS
The software companies think they know what you want, but then with each update (hardly
an upgrade), they bury the tools you use 99% of the time under layers of “sales features.”
Th i s i s h ow G o o g l e r u i n e d their e-mail I have to make extra
years The problem in the
indus-try is that everyone believes you
can hire someone to snap a CAD
dimension and throw it over the
wall to manufacturing
Steve Washeim
What goes around
Your recent cover and associated
article struck a responsive chord
with me (“Better Alternatives for
Wind Power,” May 10) I worked
fo r o n e o f t h e N a t i o n a l L a b s
during President Carter’s
unco-ordinated lunge in the general
direction of what we now know
as green energy Someone at
an-other lab conceived the idea of
harvesting the jet stream by
fly-ing kites that were conceptually,
if not geometrically, similar to
the one on your cover That was
in 1980 You might be amused
RS# 113 AUGUST 9, 2012
MACHINE DESIGN.com
14
Trang 17Groschopp uses the Fast Track™ department to quickly build motors/gearmotors to meet customer’s demands Because Groschopp stocks components rather than fi nished motors/gearmotors, we can easily make modifi cations to the motor/gearmotor to meet your requirements Modifi cations include:
t Various bolt hole patterns
t Face/foot mountings with special fl ange
Need a few motors quickly? Submit your application specs at www.groshcopp.com/specs or call (800) 829-4135 and ask to speeak with a regional account manager
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RS# 114
Trang 18SCANNING FOR IDEAS
Edited by Stephen J Mraz
Rotary actuator
increases speed, rotation, and
response while cutting costs
Request free information vi
a our Reader Service Web site at
www.machinedesign.com/
rsc
reportedly capable of higher speeds,
greater range of rotation, faster
responses, and more-precise
shaft movement than other
actuators The low-power
unit, which is based on an
innovative dual-coil,
seg-mented stator design, also
costs about one-third less
than existing rotary
actua-tors This means the device
new and inexpensive way
to make segmented stators
without air gaps, which interfere
with the motor’s magnetic field The
de-sign also uses two, separately accessible
coils, resulting in a compact, quiet, and
durable actuator
To improve the speed and control of rotary actuators used in laser
scan-ning and other optical systems, engineers at Pangolin Laser Systems,
Orlando, Fla (www.pangolin.com), decided to take matters into their own
hands and designed a new rotary actuator The result, the VRAD-1510 is
For durability, the actuator uses a
mag-netic spring and preloaded ball bearings
The unit also does not need mechanical
stops on shaft rotation, which eliminates
much of the noise, wear, and vibration
The shaft rotates more than ±60° from
the neutral position The actuator also has
front and rear shafts, letting users add an
encoder or position sensor for closed-loop
operations, or other optional attachments
The VRAD-1510 features a linear
re-sponse So applying twice the voltage gives
twice the output angle; applying three
times the voltage results in three times the
output angle
The actuator’s coils can be driven in
se-ries, in parallel, or separately, which makes
the device flexible in terms of how it can be used For example, instead of using both coils to generate torque, one can be used for dynamic braking or to sense velocity
Units can be configured to meet tomers specs in terms of torque factor, magnetic-spring stiffness, coil resistance and inductance, shaft diameter and length, bearing preload, and operating tempera-ture range The rectangular shaped unit measures 1.5 × 1.0 × 1.5 in
cus-RS# 401
Stator
Coil Magnet
Output shaft Precision
bearing
Precision bearing
End block
AUGUST 9, 2012 MACHINE DESIGN.com
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Trang 19COMMUNITY: element14.com
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RS# 115
Trang 20SCANNING FOR IDEAS
Hardened high-alloy-steel spiral-bevel gears for high speed and loads, and smooth, quiet operation
Gear-drive units from Mitrpak, Uxbridge, Mass
(www.mitrpak.com), have proven reliable for
power transmission for over 30 years in the
most-demanding applications All of the
drives, including right-angle,
three-way, and counterrotating units,
give users mounting
flexibility, with each
drive having several
shafts are standard The
drives’ gear-meshing assembly
gives users quiet, vibration-free
performance And a bearing
locknut makes maintenance
in the field efficient and
economical
Drives are shipped
completely enclosed, sealed,
and lubricated for life with
Exxon Nebula EP-O This grease
withstands operating temperatures
from –65 to 250°F And bonded-lip
grease seals provide positive grease retention,
a feature recommended for food and
drug-handling equipment Users can also specify
hardcoated housings and bearing locknuts for
food-processing equipment Hardcoating is an
electrochemical penetrating process that prevents
peeling and flaking
Right-angle and three-way units range in weight
from 2 to 20 lb, can handle inputs from 20 to
4,000 rpm, and transmit 26.3 to 630 lb-in of torque
Counterrotating units weigh from 2 to 8 lb, handle
inputs from 100 to 4,000 rpm, and transmit 22 to
Bonded-lip grease seal, recommended for use in food and drug industries
Metric, double- shielded, permanently lubricated ball bearings
Corrosion-resistant, stainless-steel shafts
Bearing locknut lets users adjust for maintenance and meshing gears.
AUGUST 9, 2012 MACHINE DESIGN.com
18
Trang 21Flexibility: The King of Motion
Flexibility and fl at profi le make them the
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RS# 116
Trang 22REPORTER’S NOTEBOOK
The fat rear tire is turned by a heavy-duty chain There is no transmission The rear tire also has a minimal suspension.
Rocket, an electric dragster,
zoomed into the record books
by setting a drag-racing record
speed, screaming through the
quarter mile in 6.9 sec and hitting
201.37 mph The epic run not only
set the record for electric
motorcy-cles, it set the record for all electric
vehicles
The bike belongs to Shawn
Lawless, president of Lawless
In-dustries in Poland, Ohio The
com-pany got its start building custom
electrically powered transport
ve-hicles Now it specializes in electric
floats and display vehicles used
mainly at theme parks
like Disneyland and
Uni-versal Studios So getting
involved with an electric
dragster wasn’t too far
removed from Lawless’
speciality But building
the electric dragster was
truly a team effort
Lawless devised the
drive and control system
“The 13-in General
Elec-tric motor is probably
from the 1960s or 70s and
originally came out of an
industrial lift truck,” says
Lawless The 29-hp motor
was rebuilt by Dennis Berube, a
fel-low racing enthusiast who runs a
welding repair shop in Arizona He
turned the integral-horsepower
induction motor into a lightened,
high-voltage racing powerplant
that typically puts out 800 hp ing a quarter-mile run
dur-The motor is controlled by a one-of-a-kind Zilla motion control-
ler from Manzanita Micro Power Systems, Kingston, Wash It can
handle 4,000 A and 400 V, and
stores 40 A-hr The motor drives the back wheel through a relatively simple chain drive There is no gear-box, so the driver needn’t worry about shifting He can concentrate
on just holding on, no mean feat on
AUGUST 9, 2012 MACHINE DESIGN.com
20
Trang 23The driver doesn’t have many controls or instruments to distract him when racing.
The Rocket gets its battery pack recharged, courtesy of a dc hookup and another large battery mounted on a trailer The process takes about 20 minutes.
A close-up of the strapped-down, 250-lb battery pack shows individual cells.
Larry McBride gets ready to set a
speed record on board Rocket, a
battery-powered electric drag bike.
mounted battery pack, which lets them take full advantage of the charger’s capability
Mechanics at Orange County Choppers in Newburgh, N. Y., from
the cable television show of the same name, designed and built the entire chassis But they got some help from Larry “Spiderman” McBride and his brother Steve The two have been racing super-charged, nitro-burning motorcy-cles for over 30 years Lawless says their know-how and experience was crucial in fielding the electric drag bike Larry was also the driver
on the record-setting run
Juice comes from a 250-lb, 355-V lithium battery pack custom
built by Derek Barger at High Tech Systems, Aurora, Colo It’s the
third and most-powerful battery pack the dragster has carried It holds up to 14.2 kW-hr of power and 40 A-hr of charge, and the bike needs all of it for each 7-sec run
The phate battery consists of 1,980 individual cells linked together It requires no cool-ing before or during racing runs To get those cells, Barger traveled to China and talked to battery firms to see what was available and what they could manufacture He found a com-pany willing to custom make cells to Barger’s specifications, and that company now supplies all of Rocket’s battery cells Still, each cell gets checked for impedance and self-discharge, and each connec-tion measured to ensure its resis-tance is sufficiently low
lithium/nanophos-A recharge is needed prior to each run and it now takes about
20 min for a full recharge using a custom charger built by Manzanita Micro that has a peak output of
75 A at 450 V At one time, ing was limited by the team’s power source, a generator But the charger has been modified to ac-cept a dc bus and the Rocket tech-nicians plug it into a large, trailer-
recharg-For safety, the bike carries a
12-V safety contactor with a kill
switch The driver also has lanyard
attaching his wrist to the throttle,
so if he “leaves” the bike, power
cuts off There is no
Resources:
High Tech Systems LLC, hightechsystemsllc.com Lawless Industries Ltd., paradefloats.com Manzanita Micro, manzanitamicro.com
Orange County Choppers,
orangecountychoppers.com
To see a video of the Rocket in action, scan this code or go to:
http://www.engineeringtv.com/ video/All-Electric-Drag-Racing- Motorc
AUGUST 9, 2012 MACHINE DESIGN.com 21
Trang 24REPORTER’S NOTEBOOK
The bike runs on special tires In
front, a Michelin Pilot slick made
for drag racing wraps around a
6-lb carbon wheel The wheel was
designed and built by technicians
at BST Wheels in South Africa
The company uses
manufactur-ing processes pioneered in the
aerospace industry Its racing
wheels are made in a single
mold-ing operation, resultmold-ing in wheels
that are stronger and much lighter
than any aluminum or magnesium
wheels The hollow-spoked wheels
also have their weight
concen-trated in the hub This reduces
inertia, which results in quicker
ac-celeration and braking
The rear wheel was another
design effort by Orange County
Choppers It was built by RC
Com-ponents, Bowling Green, Ky It
car-ries a wide Mickey Thompson drag
slick designed by Larry McBride
The bike has traditional hydraulic
brakes front and rear, but they’re
equipped with special Jay Brake
pads that can handle the stresses of
stopping a 1,080-lb bike going over
200 mph Despite the high top-end
speed, there is no parachute
The biggest hurdles enroute to
setting the speed record, according
to Lawless, were those imposed by
a TV crew eager to film the event
“Designing, building, testing,
and breaking the record within the
time constraints of the TV crew was
the biggest challenge But
every-one worked overtime to make sure
we got it done Failure was not an
option,” he says
Lawless and his team are still
working to improve their
mo-torcycle “There is still room for
improvement with the batteries,”
he says “Newer cells are becoming
available and they should let us
shave 50 to 100 pounds from the
bike We’ll also lighten the front
end and replace our conventional
bearings with ceramic versions
Ul-timately the chassis will be rebuilt
with stronger, lighter materials
The goal is to make the bike the
quickest drag bike, regardless of
its powerplant.” MD
Researchers at
the National Institute of Standards and Technol- ogy have
developed a sensor that detects mag-netic fields
as weak as one picotesla (one-trillionth
of a tesla) For comparison, the Earth’s magnetic field
is 50 million times stron-ger than a picotesla The sensor, about the size of a sugar cube, contains about 100 billion rubidium atoms heated and va-porized into a gas A low-powered IR laser is fired into the atoms and a fiber-optic sensor detects how much of the laser makes it through the rubidium
Rubidium atoms absorb more light as the magnetic field around them increases, the quality that let the researchers actually measure magnetic fields
The new device is slightly less sensitive to magnetic fields than a squid (superconducting quantum interference device), which is considered the gold standard of magnetic sensors and is the preferred sensor in magne-toencephalography (MEG) machines
MEG is a noninvasive procedure for imaging magnetic fields generated
by electrical brain activity It is used to explore the perceptual and tive process in healthy humans and to test the vision of newborns and map brain activity prior to brain surgery for removing tumors or treating epilepsy
cogni-The downside of squids: they must be kept at –269°C to get good sults, which requires they have cryogenic cooling The new sensor, how-ever, operates at room temperature and is small and lightweight It can also
re-be mass produced, while squids are difficult to fabricate and assemble.Researchers hope to get the cost of MEG machines down to where every hospital can afford one to test for traumatic brain injuries They even foresee the day football teams have their own MEG machines The research team is currently trying to boost the amount of light that gets detected and measured after making it through the rubidium This would make the new sensor as sensitive as squids MD
Continued from page 21
A new magnetic senor developed at NIST has already been used to measure alpha waves in brains of human volunteers.
A better way to look at brains , thanks to magnetic sensor
22
Trang 25THAT’S WHY THE LEADING INDUSTRIAL COMPANIES
COUNT ON TE CONNECTIVITY.
Productivity Effi ciency Reliability It all depends on better connectivity TE Connectivity
is there, every step of the way—leveraging innovations across markets to deliver the
broadest portfolio of solutions to connect power, data and signal in the toughest working
environments Whether it’s more automated processes, intelligent buildings, smarter
transportation or cleaner energy, we’re helping solve industries’ greatest connectivity
challenges And making every connection count EveryConnectionCounts.com
Trang 26REPORTER’S NOTEBOOK
In addition, the hydraulics are paired with environmen-tal chambers that let test engineers dial in different cli-
mates For example, the chambers can create temperature swings from -45 to 80°C over a 2-hr period, while maintaining humid-ity levels from 10 to 90% This isn’t quite the range needed to produce rain in the chamber, but it can create fog The chambers also let engineers check component resistance to sunlight The artificial sun within the chamber can generate 1,350 W/m2.According to Terence Miranda, program manager for NATRiP, the centers can replicate 1,000 customer-equivalent miles for every hour under test Manually driven tests usually only average ap-proximately 50 mph, and so it would take 20 hr of driv-ing time to replicate 1,000 miles of wear and tear.All equipment uses the same controllers and software for safety, reproducibility, and simpler maintenance MD
boost automotive-part manufacturing and exports
from India OEMs, along with Tier 1 and 2 component
suppliers, can use the testing facilities to help make
automotive products that meet specifications in the
world market
One of the suppliers
of test equipment in the
centers is the Industrial
Group of Moog Inc.,
Elma, N. Y It is providing
servohydraulic test
equip-ment, including
simula-tion tables (also known
as multiaxis shaker tables
or MASTs), tire-coupled
simulators, universal test
benches, and hydraulic
power units This test equipment can simulate on-road
load conditions in the laboratory for small
compo-nents or full-sized vehicles
Each MAST consists of a six-degree-of-freedom
ta-ble that can replicate the vibrations, frequencies, and
impacts of a vehicle traveling on a highway
Automo-tive simulators can easily recreate 10-g shock loads.
India beefs up its
automotive testing
A technician at a NATRiP automotive test center in India sets the parameters for a driver’s chair mounted on a Moog 6 DOF multi-axis shaker table The table can simulate the vibrations, frequencies, and impacts of a vehicle on the road, compressing 20 hours of driving into a single hour of table time.
When one thinks about
coun-tries noted for their
automo-biles, thoughts usually turn to
Germany, Italy, France, and,
of course, the U. S India as an
automotive manufacturer
sel-dom comes to mind But a joint
project by the government
of India, a number of state
governments, and the Indian
Automotive Industry may
change all that
Their combined effort has
led to the establishment of
centers that are part of the
National Automotive Testing
and R&D Infrastructure Project
(NATRiP) That project is
tar-geting basic automotive R&D,
component testing, and
vali-dation procedures to ensure
compliance with national and
international automotive
stan-dards The goal of the project is
to move India into a prominent
position in the global
automo-tive market
NATRiP facilities also aim to
The goal of the National Automotive Testing and R&D Infrastructure Project
is to move India into a prominent position in the global automotive market.
AUGUST 9, 2012 MACHINE DESIGN.com
24
Trang 27Penton Media’s Design Engineering Group and the National Fluid Power Association will present two in-depth conference tracks — 1) Motion Control in Automation, and 2) Hydraulics and Pneumatics in Automation — for engineers and individuals tasked with improving performance, productivity, life, effi ciency, and environmental footprint of manufacturing equipment and industrial automation systems
027,21&21752/,1$8720$7,2175$&.
INDUSTRIAL AUTOMATION
NORTH AMERICA at IMTS 2012
For more information please contact: Adrian Piazza at 216-931-9426 or adrian.piazza@penton.com
To register for the MDA conference and IMTS, please visit industrialautomation-na.com
RECENT ADVANCES IN PREDICTIVE TECHNOLOGIES FOR NEXTGENERATION
MACHINES AND MANUFACTURING SYSTEMS
Unscheduled downtime is a productivity killer that can cost a company tens of
thousands of dollars in damaged goods and lost output Here’s a look into the
latest research involving condition monitoring and predictive maintenance,
along with advice on how to economically upgrade controls and equipment
Speaker: Research Center on Intelligent Maintenance Systems, University of Cincinnati
TRENDS IN HIGHSPEED BEARINGS
Spindles on machine tools, and machines in general, are running faster
That can lead to issues like vibration, chatter, and other unwanted dynamic
characteristics that adversely aff ect cutting speed and quality, as well as the
precision and repeatability of movements New bearing designs, lubricants,
and sophisticated software counteract these problems and let engineers further
push the machine-design envelope Speaker: Schaeffl er Group
SECURITY IN INDUSTRIAL AUTOMATION
Computer viruses like Stuxnet, Duqu, and now Flame are making news for
infecting and wreaking havoc on industrial computers and controllers This
session off ers timely advice on steps to take to protect your equipment from
viruses, hackers, industrial espionage, and even the well-intentioned but
misguided worker on the plant fl oor Speaker: Rockwell Automation
HOW SMART ENGINEERING & MODULAR HARDWARE CONCEPTS
CONTRIBUTE TO EFFECTIVE MACHINE AUTOMATION SOLUTIONS
We will explore the latest market trend of OEMs transitioning from a
one-size-fi ts-all approach to custom solutions Plus, learn eff ective ways to overcome
the challenges of completing more engineering projects with fewer resources
and how a mechatronic engineering approach, effi cient software tools, and
modular hardware provide eff ective solutions for your equipment
Speaker: B&R Industrial Automation
TECHNIQUES FOR BOOSTING MACHINE EFFICIENCY
The motors and drives, gears and drive trains, controls, cooling, and auxiliary functions, as well as proper power management, all play a role in machine
effi ciency Several techniques can be employed to reduce the amount of energy
a machine consumes Speaker: Heidenhain Corporation
THINK LIKE A MACHINIST
Many designers and engineers learn solid modeling in universities or technical schools and then start designing machines and components without considering whether the 3D CAD component is actually manufacturable The result: The machinist is often confronted with parts that are unnecessarily diffi cult
or impossible to make This discussion will off er some practical tips on how engineers and CAD/CAM users can design easier-to-manufacture components that cost less, off er faster turnaround, and consistently higher quality
Speaker: Aztalan Engineering
MECHANICAL AND STRUCTURAL CONSIDERATIONS FOR PRECISION MOTION CONTROL
In high-speed and high-precision motion systems, controls engineers who ignore the mechanical components and machine structure do so at their own risk We examine mechanical factors engineers should consider, such as inertia, natural frequency, vibration, thermal deformation and other factors that lead to
a loss of precision, and explain how to compensate for or totally eliminate the problems Speaker: Bosch Rexroth
NEXT GENERATION CNCS
CNCs and motion controllers are the brains of many manufacturing systems Here’s a look at recent advances in “intelligent” machine controls, artifi cial intelligence, adaptive control, and low-cost controllers with advanced functions.Speaker: Siemens
Trang 28Our New Standard in Geared AC Motors
• 2 Times More Torque
• High Strength, Long Life
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Stepping Motors • Servo Motors • AC Motors • Brushless Motors •
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REPORTER’S NOTEBOOK
Custom couplings
The NASA rover Curiosity recently
reached Mars and if all went well, the wheeled robot is relying on several cus-tom components from the engineers at
Helical Products Co Inc., Santa Maria, Calif For example, the
subsys-tem mounted on the rover’s front-mounted arm that will dig up and retrieve soil samples makes use of a flexible coupling from Helical The coupling lets soil samples be vibrated and sifted, so only powder
is transferred inside Curiosity for further processing and analysis The
coupling is compliant in all directions (axial, angular, and parallel), so
it can compensate for misalignments to the vibratory drive The pling also reduces bearing loads on the drive while reliably transmit-ting the torque needed to sift the samples
cou-After five months of intensive design work, Helical manufactured the couplings out of 15-5PH stainless steel heat treated to H1025 This will give the device the strength, fatigue resistance, and ability
to maintain these characteristics despite the frigid Martian tures (–160°F) Engineers at Helical also had to add NASA-specified connectors to both ends of the coupling
tempera-The rover also incorporates custom-machined springs from Helical They are critical components in a locking mechanism that ensure the rocker-bridge joints in the rover’s six-wheeled suspension stay locked
in place once unfolded and deployed on the surface of Mars The lightweight titanium springs had to meet strict requirements for com-pression and lateral translation spring rates And like the couplings the company made for the rover, the springs needed to have NASA-approved connectors. MD
The arm on front of Curiosity,
NASA’s latest Martian rover, will carry a custom coupling.
Trang 29Brushless Motor Advantages
• Compact, High Torque
• Wide Speed Range
• Continuous Duty
• No Maintenance
Brushless Motors offer all the design flexibility needed for many different types
of applications
Learn more about the Brushless Motor Advantages from Oriental Motor.
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Stepping Motors • Servo Motors • AC Motors • Brushless Motors • Linear & Rotary Actuators • Cooling Fans
REPORTER’S NOTEBOOK
New chips offer
efficiency with accuracy?
Not exactly…
gies University in Singapore, the Center for Electronics and
Micro-technology in Switzerland, and the University of California, Berkeley,
has been working on the project since 2003 The goal was to get
“inex-act” chips that use less power by making a few mistakes in calculations
By managing the likelihood of errors and limiting which calculations
cre-ate errors, researchers found they can cut energy demands while
boost-ing performance
One approach eliminates rarely used portions of digital circuitry The
first pruned chips were twice as fast, half the size, and only needed half
the energy of their more-accurate, intact cousins
Another approach uses a technique called confined voltage scaling It
takes advantage of processing speed to cut power demands Tests show
inexact chips with an average 0.25% error rate cut energy demands by a
factor of 3.5 compared to traditional chips That factor could rise to 15
Obviously, high-error rates would not work well in an engineering
environment But processing a photo is another matter There, small
er-rors are ignored by the human eye For example, it was found relative
errors up to 0.54% were almost indiscernible while rates up to 7.5% still
produced discernible images Initial uses for the pruning technology will
most likely be in application-specific processors embedded in hearing
aids, cameras, and other electronic devices
The inexact hardware is also key to a new educational computer
tab-let called an I-slate The I-slate is for classrooms in India with no
electric-ity and few teachers The low-power needs of the pruned chips should
let the I-slate run on solar panels similar to those in handheld calculators
The first I-slates are expected to go on sale next year. MD
Inexact computer chips like this prototype are 15 times more efficient in terms of speed, size, and energy consumption than today’s microchips.
Photo: Avinash Lingamneni/Rice University/CSEM
Resources:
Rice University,
bit.ly/JNjFdN
Prototypes of a new
computer chip recently
unveiled at the ACM
International
Confer-ence on Computing
Frontiers are 15 times
more efficient than
equivalent chips made
using current
pro-duction technology,
promising major power
reductions and
ex-tended battery life for
portable devices But
these efficiency gains
didn’t come without a
price: the chips make
occasional errors
Though the concept
is deceptively simple,
a research team with
members from Rice
University in Houston,
Nanyang
Technolo-RS# 119 AUGUST 9, 2012
Trang 30from Hypercom Corp., Phoenix.
A driver’s license or other valid photo-ID card is first scanned, en-crypted, and stored on the True ID device, along with payment informa-tion When the customer next pays with a check or credit card, the device instantly displays their photo on the terminal for verification
The ICE 7000CE has a 6-in., 256-color ¼-VGA touch graphics and pen-input screen It uses a 32-bit CPU running at 128 MHz
30 YEARS AGO — 1982
Screen eliminates CRT keyboard: An
unusual touch-sensitive CRT screen
from Detector Electronics,
Minneapo-lis, supplements — and can supplant
— a conventional keyboard Called TouchMagic, the transparent control screen is said to
be a simple and straightforward method of inter-facing between people and com-puter memory No special training
or keyboard expertise is needed The screen, which fits over conventional CRT screens, has 16 horizontal electri-cal paths on a convex glass panel posi-tioned opposite 16 vertical paths on a plastic sheet Each position where the
32 paths cross is a switch position
50 YEARS AGO — 1962
Manned moon landing from an
or-biting spacecraft is foreseen by two
Lockheed Missile & Space Co
engi-neers A space vehicle carrying three or four men would be launched from the Earth and enter moon’s orbit at an alti-tude of 100 miles A two-man vehicle would detach
from the craft, descend to the moon for
a week’s stay, the return to the orbiting vehicle for the trip back
to Earth This plan is similar to one for Project Apollo, which was recently ap-proved by NASA MD
AUGUST 9, 2012 MACHINE DESIGN.com
28
Trang 315IFPSJHJOBM4,'&YQMPSFSCFBSJOHTTFUBOFXXPSMETUBOEBSEGPS QFSGPSNBODFBOEFOEVSBODF/PXBMMTUBOEBSE4,'TQIFSJDBM SPMMFSUISVTUCFBSJOHTIBWFCFFOVQHSBEFEUPBOFXMFWFMPG QFSGPSNBODF
$PNCJOJOHDMFBOBOEIPNPHFOPVTIJHIRVBMJUZTUFFMXJUIBO BTVQFSJPSCBMBODFCFUXFFOIBSEOFTTBOEUPVHIOFTT5IJT BEWBODFNFOUHJWFTVQHSBEFE4,'&YQMPSFSTFMGBMJHOJOHSPMMFS
UIFSFBSFIJHIMFWFMTPGDPOUBNJOBUJPOPSQPPSMVCSJDBUJPO DPOEJUJPOT
Trang 32REPORTER’S NOTEBOOK
NEW FACILITY
Altra Industrial Motion, South
Beloit, Ill., is building a 90,000-sq-ft
manufacturing facility in
Chang-zhou, China (near Shanghai) The
new plant will be home to Altra
Industrial Motion Changzhou
(AIMC) Altra is multinational
de-signer, producer, and marketer of mechanical power-transmission products, as well as the largest se-lection of industrial couplings
ACQUISITION
Agilent Technologies, Santa
Clara, Calif., will acquire the test
and measurement business of
Centellax, Santa Rosa, Calif
Centel-lax designs and manufactures error ratio testers and signal gen-erators used for testing high-speed digital-communication systems and components Agilent offers measurement product for chemical analysis, life sciences, electronics, and communications
bit-AWARDS
3V Fasteners Co Inc., Corona, Calif.,
a subsidiary of PennEngineering Co., received the prestigious “2011 Platinum Supplier Award” by Spirit AeroSystems Inc., Wichita, Kans The
award recognizes overall customer satisfaction and excellent perfor-mance 3V Fasteners, one of only 13 companies – and the only fastener manufacturer – selected from Spirit’s entire worldwide supplier base to win the award Spirit designs and manu-factures aerostructures for commer-cial aircraft 3V Fasteners manufac-tures precision aerospace fasteners
AGREEMENT
Dunkermotor, Elgin, Ill., a
manufac-turer of intelligent servomotors, has expanded its distribution agreement
with Axis New England, Danvers,
Mass., to include Dunkermotor’s complete line of rotary motor prod-ucts Axis provides manufacturing solutions in the motion-control and machine-automation fields
PARTNERNETWORK PROGRAM
New suppliers and machine builders
have joined the Rockwell tion PartnerNetwork Program.
Automa-New Automation Encompass members in the Americas region
are 3M Cogent, a wholly owned subsidiary of 3M Co within 3M’s Security Systems Div.; General Cable, a developer, designer, man-
ufacturer, marketer, and distributor
of copper, aluminum, and optic wire and cable products for the energy, electrical infrastructure,
fiber-and communications markets; RF IDeas Inc., a provider of card read-
ers A new Asia Pacific member is
InHand Networks, a
machine-to-RS# 121 AUGUST 9, 2012 MACHINE DESIGN.com
30
Trang 33Optocouplers are the only isolation devices that meet or exceed the IEC 60747-5-5 International Safety Standard for insulation and isolation. Stringent evaluation tests show Avago’s optocouplers deliver outstanding performance on essential safety and deliver exceptional High Voltage protection for your equipment Alternative isolation technologies such as ADI’s magnetic or TI’s capacitive isolators do not deliver anywhere near the high voltage insulation protection or noise isolation capabilities that optocouplers deliver.
For more details on this subject, read our white paper at: www.avagoresponsecenter.com/672
Avago Technologies Optocouplers
Trang 34COMSOLCONFERENCEBOSTON
20 1 2 OCTOBER 3 - 5
REPORTER’S NOTEBOOK
machine technology company
Control Station Inc., a
manufac-turer of Loop-Pro software, has
expanded its membership
New members of the Rockwell
Automation OEM Program
(for-merly the Machine Builder
Pro-gram) include Aagard Group LLC,
Alexandria Minn., which designs, engineers, and manufactures auto-mated packaging machinery; and
Tennessee Rand, a provider of
en-gineering, machining, and robots
RADIOTRONIX PRODUCTS
Linx Technologies, Merlin, Oreg.,
a developer and manufacturer of wireless products including radio-frequency modules, is shipping the
product lines it acquired from tronix earlier this year.
Radio-ANNIVERSARY
TÜV Rheinland, Boxborough, Mass.,
is celebrating 140 years of pendent certification, testing, and assessment services to businesses worldwide The company began as an entrepreneurial endeavor to inspect boilers in the districts of Elberfeld and Barmen in Germany
inde-NAME CHANGE
Thermadyne Holdings Corp.,
St Louis, has changed its name to
Victor Technologies Group Inc
and the name of its wholly owned
subsidiary Thermadyne Industries Inc to Victor Technologies Inter- national Inc Victor Technologies
provides cutting, welding, and control equipment
gas-RETIREMENT
Punita Pandit, cofounder of Animatics,
has retired after 24 years Punita started Animatics upon graduating from San Jose State Univ and was instrumen-tal in establishing operations and processes of the company including finance, distribution, manufacturing,
and marketing Moog acquired
Ani-matics in 2011, at which time the pany became Moog Animatics
com-PERSONNEL
Wilbrecht LEDCO Inc., St Paul, a subsidiary of Microprecision Elec- tronics SA, has appointed Robin Lin-
dorfer as Switches and Foil Resistors Product Manager
ENGINEERING SCHOLARSHIP PROGRAM
Exlar Corp., Chanhassen, Minn.,
awarded $1,000 scholarships to four high-school graduates planning to pursue engineering degrees In its second year, the Exlar Scholarship Program is awarded to students planning to pursue engineering degrees Exlar designs and manu-factures linear and rotary-motion products MD
RS# 123