He came upon a set of cockpit indicators from a Cold War-era RAF airplane — sorry, “aeroplane” — that used a magnetically driven rack and pinion to swivel a set of prism-shaped pieces to ...

The pinion is a small gear at the end of the vehicle’s steering column that engages the rack. Though steering racks are hearty, they sometimes require replacement. Signs of a failing rack ...

where the drive gear is larger than the driven gear. A pillar drill with a rack and pinion arrangement The speed at which a gear or wheel rotates is measured in revolutions per minute (rpm).