Split gearing, another technique, consists of two gear halves positioned side-by-side. Half is fixed 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 getting rid of backlash. In another edition, an assembler bolts the rotated half to the fixed fifty percent after assembly. Split gearing is normally used in light-load, low-speed applications.
The simplest and most common way to reduce backlash in a pair of gears is to shorten the length between their centers. This moves the gears right into a tighter mesh with low or actually zero clearance between the teeth. It eliminates the result of variations in center distance, tooth sizes, and bearing eccentricities. To shorten the center distance, either adapt 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 usually found in heavyload applications where reducers must reverse their direction of rotation (bi-directional). Though “fixed,” they could still require readjusting during assistance to pay for tooth wear. Bevel, spur, zero backlash gearbox 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 brief center distance, spring-loaded split gears, plastic 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 devices that obtain near-zero backlash are found in applications such as robotic systems and machine tool spindles.
Gear designs can be modified in several methods to cut backlash. Some strategies change the gears to a set tooth clearance during preliminary assembly. With this approach, backlash eventually increases because of wear, which requires readjustment. Other designs make use of springs to carry meshing gears at a continuous backlash level throughout their services lifestyle. They're generally limited by 
light load applications, though.