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。

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.

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结果表明，在一定工作空间范围内，主动冗余支链可以显著提高并联机床的刚性。

The results show that in certain range of the workspace, active redundant leg can increase stiffness of PKM significantly.

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铸件经过严格的人工时效和振动时效，确保了机床的刚性、稳定性。

Casting pass by strict artificial aging and vibration aging so as to make sure the rigidity and stability of lathe.

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