Split gearing, another method, consists of two gear halves positioned side-by-side. One half is set to a shaft while springs cause the other half to rotate slightly. This increases the effective tooth thickness to ensure that it totally fills the tooth space of the mating gear, thereby getting rid of backlash. In another version, an assembler bolts the rotated half to the fixed fifty percent after assembly. Split gearing is generally used in light-load, low-speed applications.
The simplest and most common way to lessen backlash in a set of gears is to shorten the distance between their centers. This movements the gears into a tighter mesh with low or actually zero clearance between tooth. It eliminates the effect of variations in center distance, tooth dimensions, and bearing eccentricities. To shorten the center distance, either change the gears to a set distance and lock them in place (with bolts) or spring-load one against the additional so they stay tightly meshed.
Fixed assemblies are typically used in heavyload applications where reducers must invert their direction of rotation (bi-directional). Though 
“fixed,” they could still require readjusting during assistance to compensate for tooth use. Bevel, spur, helical, and worm gears lend themselves to fixed applications. Spring-loaded assemblies, on the other hand, maintain a continuous zero backlash and tend to be used for low-torque applications.
Common design methods include short center distance, spring-loaded split gears, plastic-type zero backlash gearbox china material fillers, tapered gears, preloaded gear trains, and dual path gear trains.
Precision reducers typically limit backlash to about 2 deg and are used in applications such as instrumentation. Higher precision units that attain near-zero backlash are found in applications such as for example robotic systems and machine device spindles.
Gear designs can be modified in several methods to cut backlash. Some methods adjust the gears to a arranged tooth clearance during preliminary assembly. With this approach, backlash eventually increases due to wear, which requires readjustment. Other designs make use of springs to hold meshing gears at a continuous backlash level throughout their program life. They’re generally limited by light load applications, though.