lly 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.