Various kinds of production systems have been established with high efficiency and flexibility in order to respond to the diversification of customer needs and machining cost reduction requests from makers. Manufacturing machines, which are considered to be at the core of the production system, play a very important role in achieving high manufacturing capability and efficiency. Machining centers, which can be considered general purpose manufacturing machines, have recently made rapid advances with regard to their high efficiency. The main spindle is one of the most important parts of a machine tool for achieving this high efficiency, and the main spindle bearings are an essential component for promoting high-speed operation. This paper presents the current status and future technical trends for main spindles and bearings.
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