alt Hacker NewsThe simple of it: Gear teeth are made in such a way so that when their faces touch as the gear rotates, they "roll" against echother faces rather than slide.
The simple of it: Gear teeth are made in such a way so that when their faces touch as the gear rotates, they "roll" against echother faces rather than slide.
The fact that it's a rolling contact, if the gears axis are parallel, and the pitch circles meet at one point, means that well made gear sets can run for decades, if properly maintained.
Some of the thousands of gears I've made will still be in service in the year 2100.