Plastic Gears: Material Selection and Dimensioning

Plastic Gears: Material Selection and Dimensioning

Several options exist for manufacturing plastic gears. We offer a wide selection of plastic materials suitable for this, including POM-C, PA6, and PEEK. But which material is best, and how do you dimension the gears correctly?

Material Selection for Gears

A common plastic material for gears is POM-C, a polyoxymethylene-based plastic. POM-C is a good choice for gears subjected to lower loads because it has a relatively low hardness of 65° Shore D. Hardness affects the gear's performance.

For gears subjected to higher loads, PA6 might be a better option. PA6 has a higher hardness, making it more resistant to abrasion and wear. However, PA6 is more expensive than POM-C, so consider whether the improved performance justifies the increased cost.

For demanding applications, PEEK can be a good choice. PEEK is a plastic with a very high hardness of 90° Shore D. PEEK is also chemical resistant and has a low weight, making it suitable for applications where weight and corrosion resistance are important factors.

Things to Consider When Dimensioning

When dimensioning plastic gears, consider factors like tooth profile, backlash, thermal expansion, and lubrication. The tooth profile is important to ensure the gears work smoothly. Backlash affects the gear's accuracy and performance.

Thermal expansion is another important factor. When a gear is exposed to heat, it can expand and change shape, which can affect performance. Therefore, it's important to choose a material with low thermal expansion.

Lubrication is also important. Plastic gears can be self-lubricating or require external lubrication. Self-lubricating gears are often made of materials like POM-C or PA6, which have low friction. External lubrication may be needed for more demanding applications.

When calculating the load on a plastic gear, consider several factors, such as the gear's size, shape, and material.

Choosing the right gear for your application requires thought. Is it better to choose a gear made of POM-C, PA6, or PEEK? It depends on your specific needs.

Do you have questions about plastic gears or need help choosing the right material and dimensioning your gear? Don't hesitate to contact us at PlastShop. We have extensive experience with plastic materials and can help you find the right solution. Contact us for advice!