De quoi est fait gear
A toothed wheel that transmits rotation and changes speed and torque.
- Torque — utilise. The gear ratio changes torque and speed.
- Bronze — est fait de. Ancient gears were bronze.
- Wood — est fait de. In mills — wooden ones.
- Fonte — est fait de. Large gears of machines and mills were cast in iron: it fills a mould well and wears slowly.
- Plastic — est fait de. Small gears in toys, clocks and printers are plastic: light and quiet.