Recently Japanese machine tool manufacturers have been keen to improve and develop their machines with better productivity. That is why Japan maintains its No.1 position in world production of machine tools. As for high productivity, the spindle speed of the machining center is increasing year by year. Lathes are also becoming increasingly multi-functional to meet the requirements of the market. The trend for high-speed spindles is to integrate the motor into the spindle. Therefore several customers are waiting for extra high-speed cylindrical roller bearings to simplify the spindle structure. NSK has boon developing extra high-speed cylindrical roller bearings with robust design and this paper reports on this development, test results and recommendations.
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