The influence of "non-standard accuracy" must be considerd among the key error factors of coaxiality of turnover boring, except the list errors in the standard of test accuracy;

影响调头镗孔同轴度的主要误差因素中，除机床精度标准中规定检测的有关误差项外，精度标准中未被列入检测的相关“非标误差”也有重要影响。

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The influence of "non-standard accuracy" must be considerd among the key error factors of coaxiality of turnover boring, except the list errors in the standard of test accuracy;

影响调头镗孔同轴度的主要误差因素中，除机床精度标准中规定检测的有关误差项外，精度标准中未被列入检测的相关“非标误差”也有重要影响。

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