The manufacturing methods of worms are roughly divided among cutting, heat treated and ground after cutting and rolling. And for worm wheels, they could be approximately divided among cutting teeth, cutting pearly whites after casting, and the teeth cutting after the outside rim is definitely cast around the guts of the blank.

As for the components for worm gears, for worms: structural carbon steel (S45C, etc.), structural alloy steel (SCM415, etc.), stainless and cast iron happen to be employed; and for worm tires: cast iron (FC200, etc.), nonferrous metals such as phosphor bronze and specialty bronze (nickel bronze, aluminum bronze, etc.), engineering plastics such as for example MC Nylon, etc. As the combination of materials for worms and worm tires influences the allowable transmission force and lubrication strategies, the decision of mating products requires careful consideration. Also, related to the friction of pearly whites, a harder material for worm than worm wheel is generally used.

Ordinarily the business lead angles of the proper and kept tooth surface of a worm will be the same. However in duplex worm gears, they are made to ensure that the tooth thickness of the worm changes continuously in the axial way to ensure that by shifting the worm axially with shims, it becomes possible to change the backlash.

If a worm gear is used, a sizable speed lowering can be obtained in a concise space in comparison to using spur gears. Generally, the worm is used to carefully turn the worm steering wheel. But when the lead position is particularly small, the worm steering wheel can not turn the worm and it is known as its self locking feature. This can be utilized effectively in some applications but it can’t be called best preventative for invert driving. (When the business lead angle is large, it is possible to change the worm with the worm steering wheel.) Furthermore, there are many benefits to worm gears such as for example low sound and vibration, but due to the significant sliding at the tooth floors (sliding contact), the performance is certainly low. (For cylindrical worm gears, the plastic worm gear general efficiency is about 30-90%.) As well, there are negatives such as they tend to have problems with tooth surface heat seizure.