最佳规模的确定将特别考虑以下两个相互矛盾的趋势:步骤过宽的规模会导致材料浪费和制造成本增加，而间距过小的规模会导致工具成本和库存价值增加。在选择数值比例时，选择与要满足的要求一致的比率最高的序列，顺序为R5、R10等。

The best scale will be determined by taking into consideration, in particular, the two following contradictory tendencies: a scale with too wide steps involves a waste of materials and an increase in the cost of manufacture, whereas a too closely spaced scale leads to an increase in the cost of tooling and also in the value of stock inventories. In selecting a scale of numerical values, choose that series having the highest ratio consistent with the desiderata to be satisfied, in the order: R 5, R 10, etc.