The simplest gears, with teeth cut straight across the face of the circumference of a disk, are called spur gears. Many low to medium speed gear trains use spur gears, which have a simple geometry ...

Scuffing often happens to new gears when tooth surfaces are not yet well run-in. Experiments show that a newly manufactured surface is able to carry only 20% of the load of a well run-in surface.

The gear tooth pattern must be dead center on the ring gear with 0.006-0.010-inch of backlash, using a dial indicator.

Strain wave gearing is a clever way to produce a high-efficiency, high ratio gearbox within a small space. It involves an outer fixed ring of gear teeth and an inner flexible ring of teeth which ...

The teeth of these natural gears don't look quite like man-made versions. The vast majority of man-made gears follow the same precise pattern, one proposed more than 200 years ago by Leonhard Euler.

John Thomas, Design and Manufacture of Spiral Bevel and Hypoid Gears for Heavy-Duty Drive Axles, SAE Transactions, Vol. 93, Section 4: 840772––841109 (1984), pp. 960-986 ...