The steel is utilized for high strength worm gears (worm wheel) and steel could be plain carbon steel or alloy 
steel. The metal gears usually are heat treated so that you can combine effectively the toughness and tooth hardness.
The phosphor bronze is trusted for worms drive to be able to reduce wear of the worms which is excessive with cast iron or steel.
Worm gear units are usually used to reduce speed and maximize torque. Because the worm drive undergoes more contact pressure cycles compared to the worm gear, the worm drive is normally of a stronger material.
• Cast iron provides strength and ease of manufacture.
• Cast steel provides easier fabrication, strong operating loads and vibration resistance.
• Carbon steels are economical and solid, but are vunerable to corrosion.
• Aluminum can be used when low equipment inertia with some resiliency is required.
• Brass is inexpensive, simple to mold and corrosion resilient.
• Copper is easily designed, conductive and corrosion resistant. The gear’s strength would enhance if bronzed.
• Plastic is inexpensive, corrosion resistant, peaceful operationally and can overcome missing tooth or misalignment. Plastic material is a lesser amount of robust than metal and is susceptible to temperature adjustments 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 produce a 27:1 reduction in speed while also changing the orientation of the rotating axis by 90 degrees. This equipment fastens to a 1/4″ shaft utilizing 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 tooth, cutting the teeth after casting, and teeth cutting after the outside rim is normally cast around the center of the blank.