Imported spindle is the original Japanese NSK bearing, P4 level, automatic up basically no noise, and the speed of 3,600 RPM no vibration, the front cover is made of waterproof type, long-term in the process of water grinding can not be water, water bearing is broken, the accuracy is not good, the back-end motor and motor are used Datong or new motor device, The domestic spindle is made of Harbin bearings, although it is copied and imported, but at high speed, there is no imported endurance, the front end is easy to water, the service life is short, the long time flushing is easy to water, the maintenance rate is much, the speed will have no small vibration, so the imported spindle will be better than the domestic.