rackwork
/ˈrækˌwɜrk/
noun
- A mechanical system using a rack (a bar with teeth) and a pinion (a small gear) to convert rotational motion into linear motion.
- Rackwork is common in industrial machinery for precise movement.
- The steering in many cars uses rackwork to turn the wheels.
- The old clock's rackwork needed oiling to keep it running smoothly.