Wooden Gear

Gears are necessary to craft BuildCraft Engines and machines, like the Quarry. The gears must be constructed sequentially, so in order to make one Diamond Gear you need four Sticks, four Cobblestone, four Iron, four Gold and four Diamonds.

To make one Tin Gear, you need 4 Sticks, 4 Cobblestone and 4 Tin Ingots.

To upgrade a gear, simply place your gear in the middle and surround it on adjacent sides with the next tier material (wood -> stone -> Iron -> Gold -> Diamond).

Usage
Stone Gear

Redstone Engine

Automatic Crafting Table