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本文谈及的罗茨泵转子型线为多圆弧──渐开线型。大型转子多用仿型法加工，仿型加工用转子样板是在线切割机上加工的。在计算线切割机输入数据时考虑了转子的移距（仿型加工后的转子为实际型线）及线切割机的钼丝直径（包括加工时烧蚀宽度）。文中提出“精度”概念，并给出了以“精度”求步长的计算公式。最后给出了电子计算机框图和一实际例子的电子计算机打印结果
This article referred to the Roots pump rotor profile is multi-arc ─ ─ involute type. Multi-purpose rotor with a large model processing, modeling processing rotor model is on-line cutting machine processing. In calculating the wire cutting machine input data to take into account the rotor displacement (imitation of the rotor after the actual line) and wire cutting machine molybdenum wire diameter (including processing ablation width). In this paper, the concept of “precision” is put forward, and the formula of calculating the step length with “precision” is given. Finally, the electronic computer block diagram and a practical example of electronic computer printing results