How Stuff Works The Gears Turning in Your Life

Spur gears

Gears are used to get things moving. Gears are one of the oldest tools around for transmitting motion. They are, in fact, behind most of your favorite moving items : trains, cars, watches, etc. American cartoonist Charles Schultz once said, “Life is like a ten speed bicycle. Most of us have gears we never use.” So get familiar with the gears that be and explore the possibilities!
Bevel Gear
A bevel gear is the kind of thing you might find in a hand drill. Spiral bevel gears have curved teeth and are usually set to meet eachother at a 90* angle. This way, a bevel gear and actually change the direction of movement by 90* just by changing directions. A bevel gear is usually shaped like a cone so that it can easily change directions. There is no need for splined shafts and hubs within the inter workings of a bevel gear.
Worm Gear
You’ll find an example of a worm gear in an old pencil sharpener. Worm and gear sets make high torque and rotational speed. So, items that need to go in a circle are great for worm gear design. Worm gears are also used to tune instruments like the guitar. In this case, a worm gear is used in conjunction with a spur gear to get the right torque.

Spur Gear
Now back to the basics : a spur gear. Spur gears are the simplest kind of gear and are also known as straight cut gears. A spur gear turns a piece that makes the splined shafts and hubs turn. Spur gears can be found in a watch, for example.
Gear manufacturing companies product all kinds of products that keep the world going. Imagine, a gear generally creates energy from its own motion rather than from a power source. This kind of efficient, industrious energy is a beauty to behold.

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