Dell XPS 13 Ultrabook Review. Dell's XPS 13 Ultrabook starts at $999. So you have a MacBook Air, a man sitting next to me on a flight from New York to San Francisco says to me as he gestures at the laptop stuffed in my seat pocket.
In rear-wheel drive automobiles the central drive shaft (or prop shaft) engages the differential through a hypoid gear(ring and pinion). The ring gear is mounted on the carrier of the planetary chain that forms the differential. This hypoid gear is a bevel gear that changes the direction of the drive rotation.
Any type of gear can be a metric gear, including: 1  Differential end gears. 2  Gear stock or pinion wire. 3  Hypoid gears.  Miter and bevel gear 1  sets. Racks and pinions.  Spur 1  gears. Worm drives and worm wheels.