Spiral bevel gears are typically created from hardened steel. One’s teeth of these gears are often ground for a more precise finish enabling little sound at high speeds. You can specify left hands or right hand based on the direction you need to run the gears
If you have a higher speed application that will require a whole lot of torque then spiral bevel gears certainly are a great choice. The gears operate at 90° to each other and also have “spiral” shaped the teeth which gives maximum tooth surface get in touch with while rotating. With contact spread over the whole tooth the spiral bevel gear can be run much faster than the straight tooth bevel gear and handle harder starts and stops.
We make spiral bevel gears only for industrial applications.
Worm gears are found in large gear reductions. Gear ratio ranges of 5:1 to 300:1 are standard. The setup is designed so that the worm can turn the gear, but the gear cannot turn the worm. The position of the worm is spiral gear china shallow and as a result the gear is held in place due to the friction between the two. The equipment is found in applications such as for example conveyor systems 
where the locking feature can act as a brake or an emergency stop.
The model cross-section shows a typical placement and use of a worm gear. Worm gears have an inherent security mechanism built-in to its design since they cannot function in the invert direction.