给出了定向管平行度误差的计算方法。
In the end the calculation method of directional barrel's parallelism error is given.
该原理可扩展到其他平行度误差的评定。
This principle can be extended to other evaluation of parallelism errors.
孔系之间的平行度误差，会影响齿轮的啮合质量。
Holes in parallel between the degree of error will affect the quality of the meshing gears.
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