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At first glance, ball bearings are
relatively simple mechanisms. However,
an analysis of their internal geometries
reveals that they are quite complex. For
example, the ball to raceway conformity,
the radial play, and the number of balls all impact the ability of a ball
bearing to support loads under a variety
of conditions.
A new solution has been developed around
the use of microprocessor-controlled
prostheses. Just like natural limbs, these
can react automatically, adapting to the
current situation.
This article takes a look at alternative-material, non-metal bearings, and it turns out the first bearings of that type - wood, in this case, were the
norm - not an alternative.
American Bearing Manufacturers Association (ABMA) Standard 9 and ISO 281 give equations for calculating
the basic dynamic radial load rating for ball bearings. These equations are based on a number of assumptions, many
of which are not valid for thin-section bearings. (Thin-section bearings are described in ABMA standard 26.2.)
Nevertheless, many thin-section bearing catalogs report load ratings based on these equations. Kaydon has developed a new method for calculating the dynamic radial load rating for thin-section ball bearings. The new method uses the contact stress and the number of stress-cycles-per-revolution to calculate the capacity. The new numbers are based on five years of actual test results. These equations can also be used to calculate the dynamic radial load rating for four-point contact ball bearings, which are not covered in ABMA standard 9 or ISO 281.
Despite posting its slowest quarter
since early 2007, AWEA remains
optimistic that the wind industry can
and will work successfully with the
revolving doors in Washington.