The manufacturing methods of worms are 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 teeth after casting, and tooth cutting after the exterior rim can be cast around the center of the blank.
As for the products for worm gears, for worms: plastic worm gear structural carbon metal (S45C, etc.), structural alloy steel (SCM415, etc.), stainless and cast iron will be applied; 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 MC Nylon, etc. As the combination of products for worms and worm tires affects the allowable transmission force and lubrication methods, the decision of mating supplies requires careful consideration. Also, related to the friction of the teeth, a harder materials for worm than worm steering wheel is generally used.
Ordinarily the lead angles of the proper and remaining tooth surface of a worm are the same. Yet, in duplex worm gears, they are created to ensure that the tooth thickness of the 
worm adjustments consistently in the axial course so that by shifting the worm axially with shims, it turns into possible to adjust the backlash.
If a worm equipment is used, a huge speed lowering can be acquired in a compact 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 cannot turn the worm and it is named its self locking characteristic. This works extremely well effectively in some applications but it can’t be called perfect preventative for reverse driving. (When the business lead angle is definitely large, you’ll be able to switch the worm with the worm steering wheel.) In addition, there are many benefits to worm gears such as for example low sound and vibration, but as a result of the significant sliding at the tooth areas (sliding contact), the productivity is usually low. (For cylindrical worm gears, the general efficiency is about 30-90%.) Likewise, there are down sides such as for example they tend to suffer from tooth surface warmth seizure.