Different gears like spur, bevel, worm and wormwheel, rack and pinion, meshed gears, and threaded bars serve various purposes. When selecting a gear system, consider speed, direction, force, space, ...

This article was updated Feb. 28, 2023. It was originally published March 1, 2000. Planetary gears can supply high levels of torque and high-speed reduction. They are also relatively compact compared ...

In any given quarter mile there is nearly a second of just sitting there coasting. On the average road course, maybe 2 or 3 seconds per lap of utterly failing to accelerate. In something like the ...