渐近法计算挂轮比用对数计算要简捷得多;但是由于用在挂轮计算中的渐近值通常受到挂轮应满足的精度、机床最多可以安装的对数以及现有挂轮的数量等三个条件的约束,所以,如果某个传动比所有的渐近值不能同时满足上述三个条件。那么该传动比就不可能用渐近法计算得到满意的结果。 The asymptotic approach to calculate the number of rounds is much simpler than using logarithmic numbers; however, as the asymptotic values ​​used in the calculation of the number of rounds are generally affected by the accuracy that the number of rounds should meet, the maximum number of pairs the machine can be mounted on, Quantity and other three conditions, so if all the asymptotic values ​​of a certain gear ratio can not meet the above three conditions at the same time. Then the transmission ratio can not be calculated asymptotic satisfactory results.