So, it is necessary to have a stabilized platform in the tool to obtain steady angle adjustable and independent to the rotation of drilling string.

因此，在调制式旋转导向工具中，就必须设置一个不受钻柱影响的、可以自动保持和调整工具面角度的稳定平台。

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Spindle bearing on the stability of operation in direct influence on the processing quality, once the spindle rotation precision decrease of the machine tool use value will be low.

主轴在轴承上运转的平稳性直接影响工件的加工质量，一旦主轴的旋转精度降低，则机床的使用价值就会降低。

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This paper presents a state space model based on spindle rotation speed for thermal errors of machine tool.

本文提出了一种基于主轴转速的机床热误差状态方程模型。

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