扁长球体是将一个椭圆体依其主轴旋转而成的。
A prolate spheroid is generated by revolving an ellipse about its major axis.
根据螺纹导程，电力控制，主轴旋转和进给运动都是同步的。
With the synchronous spindle the spindle rotation and the feed motion are synchronized by an electronic regulation according to the lead of thread.
对内圈可分离的NNU49系列轴承，一般在内圈装上主轴后再作滚道的精加工，以获得高的主轴旋转精度。
NNU49 series of separable inner ring bearings, usually installed in the inner ring raceway spindle for finishing and then to obtain a high precision spindle.
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