Split gearing, another method, consists of two equipment halves positioned side-by-side. One half is fixed to a shaft while springs cause the other half 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 edition, an assembler bolts the rotated half to the fixed half after assembly. Split zero backlash gearbox china gearing is normally used in light-load, low-speed applications.
The simplest & most common way to reduce backlash in a pair of gears is to shorten the distance between their centers. This moves the gears right into a tighter mesh with low or even zero clearance between the teeth. It eliminates the result of variations in center distance, tooth dimensions, and bearing eccentricities. To shorten the guts distance, either adjust the gears to a fixed range and lock them set up (with bolts) or spring-load one against the other so they stay tightly meshed.
Fixed assemblies are typically found in heavyload applications where reducers must reverse their direction of rotation (bi-directional). Though “set,” they could still need readjusting during service to compensate for tooth wear. Bevel, spur, helical, and worm gears lend themselves to fixed applications. Spring-loaded assemblies, however, maintain a constant 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 models that attain near-zero backlash are found in applications such as robotic systems and machine device spindles.
Gear designs can be modified in many ways to cut backlash. Some methods modify the gears to a arranged tooth clearance during initial assembly. With this approach, backlash eventually increases because of 
wear, which needs readjustment. Other designs use springs to carry meshing gears at a continuous backlash level throughout their service lifestyle. They’re generally limited to light load applications, though.