The primary good thing about worm gears is their ability to provide high reduction ratios and correspondingly high torque multiplication. They may also be employed as rate reducers in low- to medium-acceleration applications. And, because their decrease ratio is founded on the quantity of gear teeth alone, they are smaller sized than other types of gears. Like fine-pitch lead screws, worm gears are usually self-locking, which makes them perfect for hoisting and lifting applications.
Although the sliding contact decreases efficiency, it provides very quiet operation. (The make use of dissimilar metals for the worm and gear also contributes to quiet procedure.) This makes worm gears suitable for use where sound should be minimized, such as in elevators. In addition, the application of a softer materials for the gear means that it could absorb shock loads, like those knowledgeable in weighty equipment or crushing equipment.
The meshing of the worm and the apparatus is a mixture of sliding and rolling actions, but sliding contact dominates at high reduction ratios. This sliding action causes friction and temperature, which limits the efficiency of worm gears to 30 to 50 percent. To be able to minimize friction (and therefore, temperature), the worm and equipment are created from dissimilar metals – for instance, the worm could be made of hardened steel and the gear made of bronze or aluminum.
Like a ball screw, the worm in a worm gear might have a single start or multiple starts – meaning that there are multiple threads, or helicies, on the worm. For a single-start worm, each total turn (360 degrees) of the worm advances the gear by one tooth. Thus a gear with 24 teeth provides a gear reduced amount of 24:1. For a multi-begin worm, the gear reduction equals the number of teeth on the gear, divided by the amount of begins on the worm. (This is different from most 
other types of gears, where the gear reduction is a function of the diameters of both components.)
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