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- No particle generation from tooth surface wear
- Operates without the need for Lubrication
- Barrier transmission allows for seal-less designs
- Low noise and vibration due to non-contact power transmission
- Easier assembly with high angular and eccentric misalignment tolerance
- Magnetic slip under overload enhances safety conditions
- Vibration Transmission Reduction
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What is diametral pitch (DP)?
The diametral pitch (DP) is often used in the United States and the United Kingdom, where the inch is the unit of measure, as a unit to express the size of gear teeth. Gears that use diametral pitch (DP) as a unit tooth size are called imperial gears or inch gears.
The diametral pitch (DP) is obtained by dividing the number of teeth (z) by the pitch circle diameter (d, in inches).
DP = z / d (inch)
In other words, the diametral pitch can be expressed as the number of teeth per 1" inch.
More teeth per inch mean a smaller tooth profile, so in the case of diametral pitch, the larger the DP value, the smaller the size of the teeth.
Inversely, for metric gears, the larger the module number means the larger the tooth profile.
The conversion formula for the module (m) from the diametral pitch (DP) is as follows:
m = 25.4 / DP
Internationally, the ISO designates the use of the module based on the metric system as the unit of measurement for gear tooth size.
In the United States, however, inch (DP) standards are the most common gearing used.
Below is a table comparing the diametral pitch (DP), module (m), and circular pitch (CP).
| Module m |
Circular Pitch CP |
Diametral Pitch DP |
|---|---|---|
| 0.39688 | 1.24682 | 64 |
| 0.5 | 1.57080 | 50.8 |
| 0.52917 | 1.66243 | 48 |
| 0.6 | 1.88496 | 42.33333 |
| 0.79375 | 2.49364 | 32 |
| 0.79577 | 2.5 | 31.91858 |
| 0.8 | 2.51327 | 31.75 |
| 1 | 3.14159 | 25.4 |
| 1.05833 | 3.32485 | 24 |
| 1.25 | 3.92699 | 20.32 |
| 1.27000 | 3.98982 | 20 |
| 1.5 | 4.71239 | 16.93333 |
| 1.59155 | 5 | 15.95929 |
| 1.58750 | 4.98728 | 16 |
| 2 | 6.28319 | 12.70 |
| 2.11667 | 6.64970 | 12 |
| 2.5 | 7.85398 | 10.16 |
| 2.54000 | 7.97965 | 10 |
| 3 | 9.42478 | 8.46667 |
| 3.17500 | 9.97456 | 8 |
| 3.18310 | 10 | 7.97965 |
| 4 | 12.56637 | 6.35 |
| 4.23333 | 13.29941 | 6 |
| 4.77465 | 15 | 5.31976 |
| 5 | 15.70796 | 5.08 |
| 5.08000 | 15.95929 | 5 |
| 6 | 18.84956 | 4.23333 |
| 6.35000 | 19.94911 | 4 |
| 6.36620 | 20 | 3.98982 |
| 8 | 25.13274 | 3.175 |
| 8.46667 | 26.59882 | 3 |
| 10 | 31.41593 | 2.54 |