March 2015
March 2015 (Complete Issue PDF)
Feature Articles
Diagnosing the Health of Medical Motors
John Morehead, national
sales manager of Crouzet Motors
(Vista, CA), was bunkered
down in his office in Palatine,
IL surrounded at all points by
ankle-deep snow from an unfortunately
terrible Chicagoâ™s
winter night.
The Future Rests on the River Leine
âœ[Motion, Drive & Automation]
at Hannover Messe is
the place where the future is
determined.â
Engineering Showcase 2015
One of our goals at Power Transmission Engineering is to help you
understand, identify and select the best technology for your
mechanical power transmission or motion control applications. With
every project, you have to decide which components to use, and which
suppliers, based on functionality, quality and price. We aim to help you make
those decisions informed by providing the latest information on current
technology, especially when it comes to mechanical components.
Technical Articles
Precision Bellows Couplings
Bellows couplings first began to be
widely used by machine tool builders
in the mid-to-late 20th century. With the
advent of CNC technology, machine
engineers started looking to improve
upon some of the negative influences
traditional power transmission couplings
can have on a precision rotary /
linear motion system.
The Modified Life Rating of Rolling Bearings: A Criterion for Gearbox Design and Reliability Optimization
Engineers typically learn that the bearing L10 life can be estimated using the so called âœC/P methodâ â” or the âœbasic rating lifeâ of
the bearing, a method rooted in the 1940s. Major developments have since led to the âœmodified rating life,â released in ISO 281:2007,
which includes the aiso life modification factor. In this paper a succession of equations used for bearing life ratings are reviewed, and
current bearing life rating practices are discussed in detail. It is shown that â” despite the introduction more than 30 years ago of
the adjustment factor of the basic rating life, and the standardization in 2007 of the aiso modification factor â” use of these improved
calculation methods are not practiced by all engineers. Indeed â” many continue referring to the old model as a way of seeking
compliance with existing, established practices.
Four-Point Bearings Do Triple Duty While Saving Space
A four-point contact ball bearing makes it easy to simplify
machine designs that combine radial, thrust and moment
loads, because it can handle all three simultaneously. They
are primarily used for slow-to-moderate-speed applications,
or where oscillatory movement is predominant.
Departments
Engineering Extravaganza (Publishers Page)
This issue we present our Hannover Fair preview.
As most of you know, Hannover is one of the biggest
trade shows on Earth, and by far the largest that includes a
significant focus on mechanical power transmission components.
Global Industrial Outlook: Oil Slick, Currency Headwinds Challenge Growth (Market Update)
End market conditions for the power transmission industry
have arguably worsened since our last column. In
December we stated that with two armed conflicts underway
impacting economic performance in Eastern Europe and the
Middle East our stance was âœBuy on the Sound of Cannonsâ¦.
Selectivelyâ while cautioning PTE readers not to be sanguine.
Product News (Product News)
New products within the Industry
CALENDAR (Events)
Events Calendar
INDUSTRY NEWS (Industry News)
News From the Industry
3-D PRINTING IS HERE! (Power Play)
Necessity is the Mother of Invention,
goes the bromide, but
this 3-D printing thing is taking
manufacturing to an entirely
different â” yes â” dimension.