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Here in the U.S., Independence Day is almost upon us. Some
celebrations focus on our country's founding, while others seem more
geared toward celebrating summer weather, friends, and family. Whatever
you're up to this holiday, let us know how summer is treating you. Is
work more lesiurely and flexible in the summer months? Or do recent cuts
mean you're working harder than ever?
In keeping with a more laid-back summertime attitude, today's
enewsletter features bolts that don't work
themselves loose, latches that install without
tools, and a way to secure printed circuit boards using lasers. Scroll down for some new
products, the latest updates from Machine Design, and industry
news.
As always, let us know what you think by commenting on aricles on the
Machine Design website, participating in our forums, or
by email.
Have a great holiday!
Jessica Shapiro
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What's a nice bolt like you doing in a joint
like this?
Threaded-fastener technology has been around since screws were used
at the Hanging Gardens of Babylon in the 7th century B.C. And many of
the nuts and bolts used today were originally designed a century or more
ago. Still, bolted joints remain one of the most common elements of
construction and machine design. But many organizations and people still
struggle with the problem of nuts and bolts loosening, which lead to
problems ranging from inconveniences to catastrophes.
Many bolt failures are caused by the joint losing clamp load due to
vibration and high dynamic loads. This can loosen bolts, the result of
relative movement eventually overcoming the friction between threads.
Loosening can also make bolts shear or fall out completely.
Read the full article.
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A better way to attach round rods to a
latch
Until now, designers who wanted to add a rod to a multipoint locking
latching system had to specify a rod with an eyelet on the end. The rod
attached to an adapter with a setscrew, and the adapter attached to the
latch’s cam using C-clips. The assembled metal components tended to
rattle against one another.
To solve this problem, engineers at Dirak Inc., Sterling, Va., developed a method of
fastening rods to latches that requires no tools or screws. Instead,
round rods slide into a polyamide adapter. The rod stays in place
without hardware, and the polyamide prevents rattling. The rod then
clips to the grooved stud of a two or three-point cam, a task that
requires no tools.
Read the full article.
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Lasers link plastic parts
Manufacturers of electronic components with printed-circuit boards
(PCBs) have a new method for mounting PCBs to their respective
thermoplastic housings or substrates: laser staking.
The technology uses the same principles as laser plastic welding. A
material transparent to the laser beam is joined to a material which
absorbs the laser energy. The absorbed energy is transmitted as heat
through the absorbing material and melts both the absorber and the
transparent layer through conduction. The technique is sometimes
referred to as laser through-transmission welding (LTTW).
Read the full article.
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UV-curing adhesive
UV22, a UV-curable, single-component epoxy reinforced with
<50-nm-diameter silica particles has good abrasion resistance, optical
clarity, shrinkage, and strength. It has a viscosity of 4,000 cps and
cures rapidly when exposed to UV light without heat.
The material has a low coefficient of thermal expansion. It is
electrically insulative and withstands exposure to solvents, acids, and
bases after postcure. Cured tensile strength is >4,600 psi, cured
tensile modulus is >500 ksi, and operating temperatures are between -60
and 300°F.
Master Bond Inc.
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Molten zinc alloy works as an
adhesive
A special injected-metal-assembly (IMA) method reduces costs as it
improves quality, performance, and productivity. The company replaces
medical assembly joining operations such as welding, soldering, press
fitting, crimping, and the like, with a molten zinc alloy as an adhesive
but without the peeling and thermal degradation issues of traditional
methods. IMA has good stress-distribution properties and performs well
in harsh environments. Molten zinc alloy cures in milliseconds, ensuring
close tolerances and part-to-part consistency over large volumes.
FisherTech
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Cure-indicating adhesive
Ultra Light-Weld 3220-SC rapidly bonds and laminates PC, PVC, PET,
ABS, and PU. It is RoHS compliant, has low viscosity, and absorbs little
moisture. The adhesive cures under light-curing spot lamps, focused-beam
lamps, or flood lamps.
When uncured, the adhesive is bright blue to let operators or machines
detect coverage gaps, voids, and air bubbles. As the adhesive cures, the
blue fades to transparency.
Dymax Corp.
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Machine Design Video Spotlight
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CAE Flow Simulation
Software |
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Jim Lindauer from CD-Adapco discusses
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Permabond adhesive certified to
standard
Permabond Engineering Adhesives announced the company's 791 adhesive
was tested and met and the specifications for Commercial Standard
A-A-3097 Type II Class 1.
Permabond 791 is a low-viscosity, fast curing, surface-insensitive
cyanoacrylate which cures faster on acidic and porous surfaces. The
company says it is ideal for bonding close-fitting components that
require a bond with good tensile and shear strength.
For information, contact Permabond.
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Vistagy introduces joint and
fastener-management software
Engineering software company Vistagy, Inc., announced the release of
SyncroFIT 2009. The software lets commercial 3D CAD users fully define
and manage joints and interfaces between parts within complex
assemblies. The tool permits fastener and hole specification, the use of
catalog part data, and design rule validation. SyncroFIT works alone or
with the company's AeroSuite package.
According to Vistagy, joint and interface definition are leading sources
of manufacturing errors. The software lets designers toggle between
point-and-vector fastener representations, clearance solids, and fully
defined hardware models depending on the design task. SyncroFIT also
provides a number of fastener related design checks, including edge
distance and pitch, countersink depth, angularity, and
length-to-diameter ratio.
For more information, contact Vistagy.
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Hernon Manufacturing, Inc.
High Performance Adhesives, Sealants, and Precision Dispensing Solutions
– Single Source Solutions
www.hernon.com
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Contact Information
Editorial questions: Jessica Shapiro
216-931-9850
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216-931-9893
Machine Design
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