Single-direction and double-direction angular contact thrust ball bearings (Figures 1.50 and 1.51) are used for machine tool spindles requiring rigid axial guidance.

单向和双向推力角接触球轴承（图1.50和1.51）都用机床主轴轴向刚性作为指导。

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A method for roll angular error measurement of NC machine tool vertical axis was studied based on straightness measurement using laser interferometers system.

以激光干涉仪直线度误差测量为基础研究了数控机床垂直轴滚转角误差的检测方法。

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