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Koyo Machinery is a world leader in the development and manufacturing of custom Centerless, Surface and Specialty Grinders. We repair and install specialty grinders for a variety of industries including Automotive, Aerospace, Bearing, Construction, Energy and MedicalThis hardens the balls, but it also changes their size. The size of bearing balls has to be perfect, sometimes within millionths of an inch, so a few more operations are needed after heat-treating. The balls next go through a grinding operation. The same kind of machine is used, but this time the coolant contains an abrasive.