The national standard specifies 13 Accuracy grades for gear pairs for gears. Use Arabic numerals 0, 1, 2 The accuracy of each level is 12, and the accuracy of the rest is the lowest. The accuracy grade of the two gears in the gear pair is generally the same grade, or different grades are allowed. At this time, the accuracy grade of the gear pair shall be determined according to the one with lower accuracy.
Among the 13 Accuracy grades, the processing technology level and measurement means of grade 0, 1 and 2 accuracy are still difficult to be popularized and need to be further developed. Grade 6 is the basic level and is also the commonly used level in design. The commonly used processing methods such as gear hobbing and gear shaping can be achieved for a long time, and can be measured with general measuring instruments. We generally choose level 6-8 in non-standard applications.
