The manufacturing ways of worms are plastic worm gear roughly divided among cutting, heat treated and ground after cutting and rolling. And for worm wheels, they may be roughly divided among cutting tooth, cutting the teeth after casting, and tooth cutting after the outside rim is usually cast around the guts of the blank.
As for the supplies for worm gears, for worms: structural carbon steel (S45C, etc.), structural alloy steel (SCM415, etc.), stainless steel and cast iron happen to be utilized; and for worm tires: cast iron (FC200, etc.), nonferrous metals such as for example phosphor bronze and specialized bronze (nickel bronze, lightweight aluminum bronze, etc.), engineering plastics such as for example MC Nylon, etc. As the combination of products for worms and worm tires affects the allowable transmission induce and lubrication methods, the choice of mating components requires careful consideration. Also, linked to the 
friction of pearly whites, a harder material for worm than worm wheel is generally used.
Ordinarily the lead angles of the right and still left tooth surface of a worm are the same. However in duplex worm gears, they are made in order that the tooth thickness of the worm alterations continuously in the axial course in order that by shifting the worm axially with shims, it becomes possible to adapt the backlash.
If a worm equipment is used, a big speed lowering can be obtained in a compact space in comparison to using spur gears. Generally, the worm can be used to turn the worm steering wheel. But when the lead angle is particularly small, the worm steering wheel cannot turn the worm in fact it is known as its self locking feature. This can be utilised effectively in some applications but it can not be called excellent preventative for reverse driving. (When the business lead angle is usually large, you’ll be able to flip the worm with the worm steering wheel.) Furthermore, there are many advantages to worm gears such as for example low noises and vibration, but because of the significant sliding at the tooth surfaces (sliding contact), the efficiency is low. (For cylindrical worm gears, the general efficiency is approximately 30-90%.) As well, there are disadvantages such as they tend to suffer from tooth surface high temperature seizure.