Abstract
The intended purpose of small ball bearings is mainly for motors in home electric appliances. The production quantity of small motors is over 12300 million according to the prediction of the year 2013. Assuming that ball bearings are applied for the 70% of them, about 17200 million small ball bearings are necessary. Usage environment of small motors becomes more hostile, and requirement for high speed and low noise is increasing. Furthermore, low cost is also requested. Therefore, bearing manufacturers are pressed for such correspondence. In this paper, some case studies performed so far by the author are described
