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镗杆圆度误差呈现明显的规律性，当镗杆上通过中心互相垂直的两个主惯面上的惯矩不等时，磨削过程即形成椭圆，且长、短轴方位与主惯面成４５°。论证了形成椭圆的主要原因是周期变化的斜弯曲，同时提出了提高镗杆圆度精度的结构设计方案及工艺诀窍。
The error of roundness of boring bar shows obvious regularity. When the moment of inertia on the two main inertia of the boring bar perpendicular to each other is different from each other, the grinding process forms an ellipse, and the long and short axis azimuth and the main habitus At 45 °. It is demonstrated that the main reason for the formation of ellipses is the oblique bending with periodic variation. At the same time, the structural design scheme and process know-how for improving the roundness accuracy of the boring bar are proposed.