From the chariot wheels crossing the Gobi Desert in 3,000 BCE to the intricate bronze clockwork of the Antikythera mechanism ...

When you push or pull with a simple machine, you are applying a force and doing work. And, if you get more force out of a machine than you put into it, then that machine has a mechanical advantage.

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 ...

Gears keep the world moving. Available in a variety of shapes and made from a wide range of materials, gears are found absolutely everywhere. From the tiniest and most delicate gears used by ...