The boring machine used to process larger diameter hole, to achieve higher machining accuracy.
镗床用来加工直径较大的孔，能达到较高的加工精度。
In this new way, a group of change gears and pitch can be selected and higher machining accuracy obtained. It is practical in production.
用本方法可以快速地选择挂轮和螺距，达到了较高的加工精度，在生产中具有实际意义。
In this new way, a group of change gears of high kinematic accuracy can be selected and higher machining accuracy obtained. It is practical in production.
用本方法可以快速地选择高精度挂轮，达到较高的加工精度，在生产中有实际意义。
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