The manufacturing methods of worms are plastic worm gear roughly divided among cutting, heat treated and ground after cutting and rolling. And for worm wheels, they can be roughly divided among cutting pearly whites, cutting tooth after casting, and the teeth cutting after the outdoors rim is usually cast around the guts of the blank.

As for the materials for worm gears, for worms: structural carbon steel (S45C, etc.), structural alloy metal (SCM415, etc.), stainless steel and cast iron are utilized; and for worm wheels: cast iron (FC200, etc.), non-ferrous metals such as phosphor bronze and specialized bronze (nickel bronze, aluminum bronze, etc.), engineering plastics such as for example MC Nylon, etc. As the combination of components for worms and worm wheels influences the allowable transmission pressure and lubrication methods, the decision of mating products requires careful consideration. Also, linked to the friction of tooth, a harder material for worm than worm steering wheel is generally used.

Ordinarily the business lead angles of the proper and left tooth surface of a worm will be 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 adjust the backlash.

If a worm equipment is used, a sizable speed lowering can be obtained in a concise space in comparison to using spur gears. Generally, the worm is utilized to carefully turn the worm steering wheel. However when the lead angle is especially small, the worm wheel can not turn the worm and it is called its self locking characteristic. This can be used effectively in a few applications but it can’t be called excellent preventative for reverse driving. (When the lead angle is usually large, it is possible to convert the worm with the worm steering wheel.) Furthermore, there are many advantages to worm gears such as low noise and vibration, but due to the large sliding at the tooth surfaces (sliding contact), the performance can be low. (For cylindrical worm gears, the general efficiency is about 30-90%.) Also, there are cons such as they tend to have problems with tooth surface high temperature seizure.