The steel can be used for high strength worm gears (worm wheel) and steel may be plain carbon steel or 
alloy steel. The steel gears are usually heat treated to be able to combine properly the toughness and tooth hardness.
The phosphor bronze is widely used for worms drive so that you can reduce wear of the worms which will be excessive with cast iron or steel.
Worm gear models are usually used to reduce speed and maximize torque. Since the worm drive undergoes more contact tension cycles than the worm equipment, the worm drive is normally of a more powerful material.
• Cast iron provides sturdiness and ease of manufacture.
• Cast steel provides much easier fabrication, strong operating loads and vibration resistance.
• Carbon steels are inexpensive and solid, but are susceptible to corrosion.
• Aluminum is utilized when low gear inertia with some resiliency is necessary.
• Brass is inexpensive, easy to mold and corrosion resilient.
• Copper is easily designed, conductive and corrosion resistant. The gear’s durability would increase if bronzed.
• Plastic is economical, corrosion resistant, quiet operationally and may overcome missing tooth or misalignment. Plastic material is less robust than metallic and is vulnerable to temperature improvements and chemical corrosion. Acetal, delrin, nylon, and polycarbonate plastics are normal.
This 27 tooth brass worm gear will be used with a worm gear to make a 27:1 decrease in speed while also changing the orientation of the rotating axis by 90 degrees. This equipment fastens to a 1/4″ shaft using a particular 1/4″ D-hub to be utilized with 1/4″ D-shaft.
The manufacturing ways of worms are roughly divided among cutting, heat treated and ground after cutting and rolling. And for worm wheels, they are often approximately divided among cutting pearly whites, cutting the teeth after casting, and pearly whites cutting after the outside rim is cast around the guts of the blank.