Spiral bevel gears are usually made from hardened steel. One’s teeth of these gears are usually ground for a more precise finish enabling little sound at high speeds. You can specify left hands or right hand depending on the direction you need to run the gears
If you have a high speed application that requires a whole lot of torque after that spiral bevel gears are a great choice. The gears run at 90° to each other and also have “spiral” shaped the teeth which gives maximum tooth surface contact while rotating. With contact spread over the whole tooth the spiral bevel gear can be run much quicker than the straight tooth bevel equipment and handle harder starts and stops.
We make spiral bevel gears limited to industrial applications.
Worm gears are used in large gear reductions. Gear ratio ranges of 5:1 to 300:1 are standard. The setup is designed so that the worm can change the gear, but the equipment cannot change the worm. The position of the worm can be shallow and as a result the apparatus is held in place because of the friction between your two. The gear is found in applications such as for example conveyor systems in which the locking feature can become a brake or a crisis stop.
The model cross-section shows an average placement and use of a worm gear. Worm gears possess an inherent safety mechanism built-in to its style given that they 
cannot function in the reverse direction.