Split gearing, another technique, consists of two equipment halves positioned side-by-side. One half is set to a shaft while springs cause the spouse to rotate somewhat. This increases the effective tooth thickness so that it completely fills the tooth space of the mating equipment, thereby removing backlash. In another version, an assembler bolts the rotated half to the fixed fifty percent after assembly. Split gearing is normally found in light-load, low-speed applications.
The simplest and most common way to lessen backlash in a pair of gears is to shorten the distance between their centers. This movements the gears into a tighter mesh with low or even zero clearance between tooth. It eliminates the effect of variations in middle distance, tooth sizes, and bearing eccentricities. To shorten the center distance, either adapt the gears to a fixed range and lock them set up (with bolts) or spring-load one against the various other therefore they stay tightly zero backlash gearbox meshed.
Fixed assemblies are typically found in heavyload applications where reducers must reverse their direction 
of rotation (bi-directional). Though “fixed,” they could still need readjusting during services to pay for tooth wear. Bevel, spur, helical, and worm gears lend themselves to set applications. Spring-loaded assemblies, on the other hand, maintain a continuous zero backlash and are generally used for low-torque applications.
Common design methods include short center distance, spring-loaded split gears, plastic-type 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 accomplish near-zero backlash are used in applications such as robotic systems and machine device spindles.
Gear designs could be modified in many ways to cut backlash. Some methods modify the gears to a set tooth clearance during preliminary assembly. With this approach, backlash eventually increases because of wear, which requires readjustment. Other designs use springs to carry meshing gears at a continuous backlash level throughout their assistance life. They’re generally limited to light load applications, though.