The accuracy of a gear rack generally refers to the error between teeth. The smaller the error, the higher the accuracy. The DIN standard divides the accuracy levels into 5-10 levels, with 5 being the highest and 10 being the lowest. Among them, level 6 is the basic level and is also the commonly used level. It can be achieved by using commonly used processing methods such as hobbing and gear shaping, and can be measured with general measuring instruments. We generally select levels 6-8 in non-standard applications. This article introduces the characteristics of each level of linear rack and pinions in the DIN standard.
DIN 6 Grade
High precision level, belonging to the grinding level.
Tooth profile error: The tooth profile error of DIN 6 gears is very small, the tooth surface is smooth, and there is almost no friction and noise, so it can ensure efficient and stable transmission.
Tooth pitch error: The small pitch error ensures the stability of gear transmission.
Applicable fields: Linear rack and pinion DIN 6 accuracy level is usually used for applications with very high precision requirements, such as precision machine tools, robots, aerospace equipment, precision transmission systems, etc.
DIN8 Grade
Medium precision level, belonging to the fine milling level.
Tooth profile error: The tooth profile error is small, but compared with DIN 6, there is still a certain tolerance range, which is suitable for more common industrial equipment.
Tooth pitch error: The tooth pitch error is low, which ensures a relatively smooth transmission effect in most applications.
Application areas: Linear rack and pinion DIN 8 accuracy level is suitable for applications with high precision requirements, but not as strict as DIN 6. It is usually used for medium-precision mechanical equipment, such as automated production lines, general machine tools, gear reducers, etc.
DIN9 Grade
A lower accuracy level, belonging to the fine milling level.
Tooth profile error: The tooth profile error is relatively large, the tooth surface is rough, and certain friction and noise may be generated during the transmission process.
Tooth pitch error: The tooth pitch error is large, and there may be obvious gaps and vibrations during the transmission process, but these errors are acceptable for some applications that do not require high precision.
Application areas: Linear rack and pinion DIN 9 accuracy level is suitable for applications with low precision requirements, usually for equipment with large loads and less concern for precision. For example, heavy machinery, conveyors, lifting equipment, etc.
| Accuracy Grade | Applicable Applications | Manufacturing process | Advantages |
| DIN 6 | High-precision applications (CNC machine tools, robots, etc.) | High-precision machining, grinding | High precision, low noise, long life, high efficiency |
| DIN 8 | Medium precision applications (automatic production lines, reducers, etc.) | Fine processing | Stable, reliable, suitable for most industrial applications |
| DIN 9 | Low-precision applications (cranes, conveyors, etc.) | Simple processing | Suitable for equipment with large load but low precision requirements |
Summary
Choosing the right linear rack and pinions accuracy level can improve the stability, efficiency and life of the mechanical transmission system, so it is very important to decide according to the accuracy requirements of the actual application.
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