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Top Stories
Plastic seems to be taking over in what has been a metal-dominated
arena in the past. Our first article takes a look at self-locking
threaded fasteners and their function in the workplace. The second piece
explains why adhesive bonds in plastic parts may actually be more
beneficial than standard mechanical fastening. Finally, a discussion on
the Machine Design forums has opened up regarding the selection of raw
material. Add your voice to the conversation.
Two videos take the spotlight this week - one illustrating the suggested
use of stainless steel rivets to prevent a very unfortunate car hood
loss, one demonstrating exactly how one might go about MIG welding to
make things more secure. Visit them on Youtube and ExpertVillage,
respectively.
--Kelsey Rubenking
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Self-Locking Threaded Fasteners Open
Opportunities
For electrical engineers combating seismic, shipping, or operational
forces while working in soft materials, self-locking threaded fasteners
cannot be viewed as mere commodities. A new kind of Spiralock fastener
uses continuous contact that improves resistance to vibrational
loosening, joint fatigue, and temperature extremes. This is good news
for those who work with materials prone to stripping or joint failure.
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FLOATING ACCESS HARDWARE
 A captive screw
assembly for permanent installation into panels of any hardness with the
capability to compensate for up to .060"/1.52mm mating hole
misalignment. Their patented MAThread® anti cross-threading screw
technology adds value by correcting off-angle installations, reliably
aligning components, and easily sliding through potentially clogged
internal threads. Type PF11MW (knurled cap) meets "operator access area"
requirements similar to UL 508 and Type PF12MW (smooth cap) meets
"service access area" requirements similar to UL 1950. Universal
slot/Phillips recess is standard. They ideally suit close
centerline-to-edge applications and can be installed on painted surfaces
without marring.
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Secrets of Bond Strength
Plastic replacements for metal parts and assemblies are a hot topic
these days. Automotive and aerospace manufacturers use plastics to cut
weight and boost fuel efficiency. For other industries, plastic means
easy-to-mold, lightweight housings and internal components. And it turns
out that the preferred way to assemble plastic parts is through adhesive
bonding rather than mechanical fastening. Leakproof glued joints in
plastic assemblies are a cinch if the surfaces are clean.
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Fast Setting Epoxy Adhesive Has One to
One Mix Ratio
 Master Bond
EP24 is a new high performance two-component epoxy adhesive that sets in
10-15 minutes at room temperatures. Durable, tough EP24 has a convenient
one to one mix ratio weight or volume. Adhesion to similar and
dissimilar substrates is excellent. EP24 is resistant to many chemicals
and is a superior electrical insulator.
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Discussion: Raw Material Selection
An interesting question has come up on the Machine Design forums.
One user has checked the actual mechanical strength of a threaded stud
against its stated requirements – and the strength seems to far
surpass the specs. Readers are invited to read, contribute, and discuss
whether this is a better or worse development for a clamping stud.
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Plastic eye bolts
The eye bolts are injection molded Nylon 6/6. They resist aromatic,
chlorinated, and ketone solvents, and petroleum and natural oils. The
bolts are rated for very light duty. Thread sizes range from 6-32
through 3/8-16 in lengths from 1.25 to 5.5 in.
More Information:
Micro Plastics
Inc.
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Comprehensive New Line of
Cyanoacrylates
 Fast-setting
Permatex® brand ZipGrip® cyanoacrylate adhesives from ITW Devcon
eliminate the need for fixturing and are ideal for bonding or repairing
plastics, metals, rubber, and other materials. Viscosities range from
liquid formulations for close-fitting parts and porous substrates to
gap-filling gels that stay in place even on inverted surfaces.
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Foam tapes
The U6000 and U6200 tapes are high-density, open-cell urethane
foams. Both are coated with acrylic adhesive for long life and high tack
on most clean, dry surfaces. U6000 has adhesive on one side while U6200
is double-sided.
The tapes are supplied in thicknesses from 1/32 to 1/8 in. and in
lengths from 50 to 200 ft. Widths from 3/16 to 54 in. are available.
More Information:
Pres-On
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Rotating component fastening system
The 96-page "Handbook of Fairloc Components, The Integral Fastener,
D243," helps solve phasing, timing, positioning, and frequent removal
problems that clamps, keyways, pins, or setscrews can't handle properly.
Advantages of the system includes built-in overload protection, full use
of the bore, easy adjustment, and compact self-contained design. The
catalog covers 3,405 products such as inch and metric Fairloc hubs, spur
gears, timingbelt pulleys, couplings, shaft extenders, shaft collars,
and dials.
More Information:
Stock Drive Products/Sterling
Instrument
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Car Hood Gets Airborne
Racing for thrills is all well and good, but you have to wonder if
it’s worth the drop in your stomach when you realize that your car is
suddenly missing its hood. According to the author of this video,
stainless steel rivets might have been a better choice than aluminum for
the fastener brackets on his ride.
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How to MIG Weld
Looking for tips and techniques on how to set up and use a MIG
welder for various welding projects? ExpertVillage.com offers a few
instruction sets, including how to weld a butt joint, angled joint and
lap joint. Purchasing and safety tips for MIG welders are also included
in this series.
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Rev up your interdisciplinary design skills
What happens when a microcontroller turns on a power FET, sending a
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Sponsored
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UPCOMING IN-PERSON EVENTS
Design-2-Part Shows are America's longest running and most trusted
events for sourcing custom parts and services.
Ten shows covering the country offer OEMs, engineers and purchasing
personnel the opportunity to meet job shops and
contract manufacturers face-to-face.
UPCOMING WEBCASTS
More Machine Uptime through New Developments in Advanced Machinable
Plastics
Sponsored by Quadrant
DATE: August 26th, 2008
TIME: 2:00pm ET/11am PT
Engineers and designers are faced with the constant challenge of
increasing uptime and reliability - while improving the performance of
mechanical systems. New, machinable advanced plastic materials can help
you reduce weight, eliminate costly and complex lubrication systems and
increase the performance of your design. Newer, more cost-effective
materials might fit into designs where before only an exotic polymer
might have done the job. Our speakers will provide an update on new
materials, selection criteria and a few case histories to show how these
new ideas have worked for other designers.
Click here to learn more and register!
Direct Metal Laser Sintering (DMLS) Gives Designers New Freedom and
Manufacturers a Higher Degree of Quality Control
Sponsored by Morris Technologies
DATE: September 4th, 2008
TIME: 2:00pm ET/11am PT
DMLS is more than a prototyping tool; it’s a viable manufacturing
alternative that can deliver parts in volume with competitive pricing.
Primarily employed for rapid prototyping, DMLS now plays an important
role in manufacturing by delivering parts in volume with competitive
pricing. Applications are wide ranging and include inserts for plastic
injection molding and die casting, as well as direct parts for a variety
of applications and industries including aerospace, automotive, medical,
electronics and many others.
Click here to learn more and register!
ARCHIVED WEBCASTS AVAILABLE FOR FREE VIEWING
Click Here for a list of archived Machine Design
webcasts.
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