Set of tools and resources for GearGen.XYZ.
Minimum recommended backlash values for gears based on the standards for AGMA, DIN and ISO. Backlash values are a reccomendation, It is important to understand what goes into deciding a backlash value, the standards are very helpful and are required reading.
Minimum recommended backlash from ANSI/AGMA 2002-B88 standard.
Backlash = 0.06 + 0.0005 × centerDistance + 0.03 × module
DIN backlash is based on the reference diameter and the application. It uses tables 1 and 2 from DIN 3967 to determine the tooth thinning and then normal backlash value must be calculated from them. The reference tooth thinning values are proposed by Niemann.
| Application | Recommended backlash (Niemann) |
|---|---|
| Casted rims | a29, a30 |
| Rims (normal backlash) | a28 |
| Rims (tight backlash) | bc26 |
| Turbo gears (high temperatures) | ab25 |
| Polymer machines | c25, cd25 |
| Locomotive gear trains | cd25 |
| Standard mechanical engineering, heavy machinery, not reversing | b26 |
| Standard mechanical engineering, heavy machinery, reversing | c25, c24, cd25, cd24, d25, d24, e25, e24 |
| Automobiles | d26 |
| Agricultural vehicles | e27, e28 |
| Machine tools | f24, f25 |
| Printing machines | f24, g24 |
| Measuring gearboxes | g22 |
Minimum backlash requirements from ISO TR 10064-2:1996 for ferrous gears in ferrous housings.
Backlash = (2/3) × (0.06 × module + 0.0005 × centerDistance + 0.03 × module)
List of modules for both fine and coarse pitch gears. Series I are the preferred modules, Series II are the extended modules. Use preferred modules for better availability and lower cost.
| Series I | Series II |
|---|---|
| 0.05 | - |
| - | 0.055 |
| 0.06 | - |
| - | 0.07 |
| 0.08 | - |
| - | 0.09 |
| 0.1 | - |
| - | 0.11 |
| 0.12 | - |
| - | 0.14 |
| 0.16 | - |
| - | 0.18 |
| 0.2 | - |
| - | 0.22 |
| 0.25 | - |
| - | 0.28 |
| 0.3 | - |
| - | 0.35 |
| 0.4 | - |
| - | 0.45 |
| 0.5 | - |
| - | 0.55 |
| 0.6 | - |
| - | 0.65 |
| 0.7 | - |
| - | 0.75 |
| 0.8 | - |
| - | 0.85 |
| 0.9 | - |
| - | 0.95 |
| Series I | Series II |
|---|---|
| 1 | - |
| - | 1.125 |
| 1.25 | - |
| - | 1.375 |
| 1.5 | - |
| - | 1.75 |
| 2 | - |
| - | 2.25 |
| 2.5 | - |
| - | 2.75 |
| 3 | - |
| - | 3.25 |
| - | 3.5 |
| - | 3.75 |
| 4 | - |
| - | 4.25 |
| - | 4.5 |
| - | 4.75 |
| 5 | - |
| - | 5.25 |
| - | 5.5 |
| - | 5.75 |
| 6 | - |
| - | 6.5 |
| - | 7 |
| 8 | - |
| - | 9 |
| 10 | - |
| - | 11 |
| 12 | - |
| - | 14 |
| 16 | - |
| - | 18 |
| 20 | - |
| - | 22 |
| 25 | - |
| - | 28 |
| 32 | - |
| - | 36 |
| - | 39 |
| 40 | - |
| - | 42 |
| - | 45 |
| 50 | - |
| - | 55 |
| 60 | - |
| - | 70 |