本文件规定了0.5模数至40模数通用滚刀的精度要求。 这些滚刀用于生产符合ISO 53和ISO 54的齿轮。 本文件适用于正齿轮和斜齿轮滚刀。它适用于实心（整体）和插入式刀片滚刀。 滚刀的基本特征根据精度分级如下: -4A级； -3A级； -2A级； -甲级； -乙级； -丙级； -D级。 4A级是精度的最高等级。 除了滚刀的基本试验外，本文件还提供了沿作用线上的切削刃进行的复合试验的允许公差。 这两组测试并不等同，人们可以选择其中一组或另一组。如果之前没有达成协议，则如果滚刀满足两种检验方法中的一种或另一种，则将其视为属于规定的精度等级。 注:本文件中的公差是为尺寸符合ISO 2490的齿轮滚刀确定的，但在采取某些预防措施后，这些公差可适用于本文件中未规定的滚刀。

This document specifies requirements for the accuracy of general-purpose hobs of 0,5 module to 40 module. These hobs are intended for producing gears which conform to ISO 53 and ISO 54. This document applies to hobs for spur and helical gears. It applies to solid (monobloc) and inserted blade hobs. The elemental features of hobs are graded according to accuracy, as follows: — Grade 4A; — Grade 3A; — Grade 2A; — Grade A; — Grade B; — Grade C; — Grade D. Grade 4A is the highest order of precision. In addition to the elemental tests for hobs, this document gives permitted tolerances for composite tests that are taken along the cutting edges on the line of action. The two groups of tests are not equivalent and one can choose between one or the other. If there was no previous agreement, the hob is regarded as belonging to the precision class specified if it satisfies one or the other of the two methods of inspection. NOTE The tolerances in this document were determined for gear hobs whose dimensions conform to ISO 2490, but with certain precautions they can be applied to hobs not specified in this document.