Because of the complexities in geometric forms of the axle and the supporting Patterns, most of the calculations of the critical speed of turning axle are difficult.

由于轴的几何形状及支承方式的复杂性，转轴临界转速计算中的许多问题，是困难的问题。

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Therefore, for improving the accuracy of exceed slender axle on turning, must need to do with the lathe fixture and cutting tool for further improvement.

因此，要提高超细长轴车削加工的精度，必须对车床的夹具和刀具做进一步的改进。

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The concept of evaluation error of the mainshaft rotary precision for turning machines defined with rotary center error and that for boring machines defined with rotary axle center are presented.

提出了用回转中心误差定义的车削类主轴回转运动精度的评定误差和用回转轴心误差定义的镗削类主轴回转运动精度的评定误差的概念。

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