Recently, there has been an increasing tendency throughout the market toward machining centers being used for production of general components and die & mold components. As complex-functionalization and multi-functionalization of machining centers progress, the market is increasingly demanding ever more sophisticated levels of performance. What is required of machining centers is minimization of dimensional errors, profile errors and machined surface roughness. These are all closely related to improvements in efficient machining of all kinds of components as well as reductions in lead times. The realization of these machining center performance demands is considered to depend on the performance of the feed drive system, system control and spindle unit system, which are the main component units of the machine, and therefore these units need to be improved. Especially, with high precision machining centers used for machining high accuracy workpieces, the performance of the spindle unit, which is located nearest to the machining point and significantly influences machining, must be improved.
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