A linear gear element that meshes with a rotating circular gear, known as a pinion. When the pinion turns, it drives the rack in a straight line, or conversely, pushing the rack turns the pinion. This mechanism is heavily used in steering systems, linear actuators, and machine tool slides to provide precise, high-force linear positioning.
Heard on the job
The carriage backlash is getting worse, so check if the teeth on the rack are worn down near the home position.
Also heard as
- gear rack
Related terms
Antibacklash
Designed to eliminate the clearance or play between mating mechanical parts like gears or lead screws.
Planet wheel
A gear that revolves around a central sun gear within an epicyclic gear train.
Escapement
A mechanical linkage that controls the release of stored energy in discrete, regular steps.