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Another way to prevent (or reduce) backlash is preload, which can be achieved with either of two designs: a split-pinion or a dual-pinion.
The split-pinion method uses two pinion halves, which mesh with opposite tooth flanks on the same rack. One half of the pinion is driven, and the other half is preloaded with an axial spring pack, which compensates for backlash.
With the dual-pinion method, one pinion is driven (aka the “master” pinion), and the other pinion (aka the “slave” pinion) is preloaded. Each pinion is driven by a gearbox and a motor, and preload is managed by the controller.