GearsReview

The gear across the beam from the orange motor on the left is the gear that drives the gear on the axle. The gear on the left is called the driving or motor gear. The gear on the grey axle to the right is the gear that is driven. The wheel on the right is called the driven or wheel gear, because the wheel will be by it on the axle. Motor gear = Driving gear and Wheel gear = Driven gear (The driving gear has the power and the wheel-gear is driven.) (A hammer drives a nail. The nail is driven by the hammer. The hammer has the power and the nail is driven.) Assume the motor will turn at the same speed for each picture below. Notice the sizes of the two gears in the above picture. If the driving gear on the left turns a distance of 16 teeth, the driven gear on the right will also turn a distance of 16 teeth. This is because the gears are the same size. Each gear has 16 teeth, so both gears will turn one revolution. If the gears are the same size they will both go the same speed. With gears the same size, neither speed nor power will be increased. . . Notice the sizes of the two gears in the above picture. The larger driving gear has 24 teeth and the smaller driving gear has 12 teeth. If the driving gear turns a distance of 24 teeth, then the driven gear will also turn a distance of 24 teeth. If the driving gears turns one revolution(24 teeth), then the driven gear will turn two revolutions (24 teeth), be cause the driven gear has half as many teeth. If the driving gear is bigger, then the driven gear will go around faster. This will turn the wheel faster causing a greater speed or a high gear. . . Notice the sizes of the two gears in the above picture. The smaller driving gear has 12 teeth and the bigger driving gear has 24 teeth. If the driving gear turns a distance of 12 teeth, then the driven gear will also turn a distance of 12 teeth. If the driving gears turns one revolution(12 teeth), then the driven gear will turn only a half revolution(12 teeth), be cause the driven gear has twice as many teeth. If the driving gear is smaller, then the driven gear will go around slower. This will turn the wheel slower causing greater power or a low gear. ..