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Suggesting a bicycle is environmentally
friendly is stating the obvious. But
the Copenhagen Wheel, unveiled at the
2009 COP15 United Nations Climate
Conference, is taking green technology
and cycling in a new direction.
In the history of machine tools, spindles have been very good relative
to other bearings and structures on
the machine. So quality professionals
have developed a cache of tools—-ball
bars, grid encoders displacement lasers, etc.—-to help them characterize and understand the geometry of the structural loop. But as machine tools have improved in their capability and precision, and the demands of part-geometry and
surface finish have become more critical, errors in spindles have become a larger percentage of the total error.
The recent trend toward using segmented laminations as a means to increase slot fill and facilitate automated fabrication of electric machines comes with a penalty of increased core loss at the segment joints.
Th e ISO defi nition of a full- complement bearing states that the bearing does not have a cage. When that defi nition was written, it was not technically possible to have a full-complement bearing with a cage. But SKF’s new high-capacity cylindrical roller bearing combines
the load-carrying capacity of a fullcomplement bearing with the benefi ts of a bearing with a cage (Fig.1).