What materials are typically used to manufacture large worm gears economically?

The choice of materials for manufacturing large worm gears often considers factors such as strength, wear resistance, manufacturability, and cost-effectiveness. In this case, the combination of a bronze rim with a cast steel spider is particularly advantageous for large worm gears.

Bronze is well-known for its excellent wear resistance and low friction properties, making it an ideal choice for the worm gear teeth that come into contact during operation. The bronze rim helps reduce wear on the mating surface, extending the lifespan of the gear while maintaining smooth operation.

On the other hand, the cast steel spider provides the necessary strength and durability to support the structure of the worm gear. Cast steel is capable of withstanding the high loads typically encountered by large worm gears, ensuring structural integrity and reliability during operation.

Overall, this combination presents a balanced approach that offers both durability and performance, while also being economically viable for large-scale manufacturing. The selection of these materials adheres to the industry's standards for robustness and efficiency in gear design.