Spiral bevel gears are typically made from hardened steel. The teeth of these gears are often ground for a more precise finish enabling little sound at high speeds. You can specify left hand or right hand depending on the direction you should run the gears
If you have a high speed application that requires a whole lot of torque then spiral bevel gears are a great option. The gears operate at 90° to each other and also have “spiral” shaped the teeth which provides maximum tooth surface contact while rotating. With get in touch with spread over the whole tooth the spiral bevel gear could be run much quicker than the straight tooth bevel gear and handle harder starts and stops.
We make spiral bevel gears limited to industrial applications.
Worm gears are used in large equipment reductions. Gear ratio ranges of 5:1 to 300:1 are standard. The setup is designed to ensure that the worm can change the gear, but the gear cannot turn the worm. The angle of the worm can be shallow and because of this the gear is held set up due to the friction between your two. The gear is found in applications such as for example conveyor systems in which the locking feature can act as a brake or 
an emergency stop.
The model cross-section shows an average placement and usage of a worm gear. Worm gears have an inherent protection mechanism built-in to its design given that they cannot function in the reverse direction.