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对数控机床进给系统中齿轮传动级数和各级传动比的分配原则进行了探讨，并推出了在最小等效转动惯量条件下，确定传动链传动级数和各级传动比最佳值的计算公式，通过实例计算表明公式实用方便。
The distribution principle of gear transmission series and gear ratios at all levels in CNC machine tool feed system was discussed. And the principle of determining transmission chain number and transmission gear ratio at the minimum equivalent moment of inertia The calculation formula shows that the formula is practical and convenient.