The primary good thing about worm gears is their ability to provide high reduction ratios and correspondingly high torque multiplication. They can be employed as swiftness reducers in low- to medium-acceleration applications. And, because their reduction ratio is founded on the number of gear teeth by itself, they are smaller sized than other styles of gears. Like fine-pitch lead screws, worm gears are usually self-locking, making them suitable for hoisting and lifting applications.
Although the sliding contact minimizes efficiency, it provides extremely quiet operation. (The usage of dissimilar metals for the worm and gear also plays a part in quiet procedure.) This makes worm gears well suited for use where sound should be minimized, such as in elevators. In addition, the utilization of a softer material for the gear means that it could absorb shock loads, like those experienced in weighty equipment or crushing equipment.
The meshing of the worm and the apparatus is an assortment of sliding and rolling actions, but sliding contact dominates at high reduction ratios. This sliding action causes friction and high temperature, which limits the efficiency of worm gears to 30 to 50 percent. In order to minimize friction (and therefore, warmth), the worm and equipment are created from dissimilar metals – for example, the worm may be made of hardened steel and the gear manufactured from bronze or aluminum.
Like a ball screw, the worm in a worm gear might have an individual start or multiple starts – meaning that there are multiple threads, or helicies, on the worm. For a single-start worm, each full switch (360 degrees) of the worm increases the gear by one tooth. Hence a gear with 24 teeth provides a gear reduction of 24:1. For a multi-begin worm, the apparatus reduction equals the number of teeth on the apparatus, divided by the number of begins on the worm. (That is different from most other types of gears, where in fact the gear reduction is a function of the diameters of 
the two components.)
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