You may not know exactly a spur gear is upon hearing the term, but you are probably much more accustomed to them than you think. Mechanical gears have played a significantly important role in the history of machining, and still being used in modern technology. A gear is a piece of metal, basically in the shape of a wheel, who have teeth around the perimeter. When a gear is used in combination with another gear and is rotated, the teeth catch one another to develop force, known as torque. When a gear is used with one or more additional gear set, it becomes a simple machine generally known as a transmission. The simplest form of gear available, and the one most commonly used, is the spur gear.
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Gears were initially used by the Greeks. Certainly one of the first examples of a gear was a device known as the Antikythera Device, which was used to calculate astronomical positions. It was discovered in 1900 when divers found out a shipwreck off of the Greek island of Antikythera. The shipwreck site produced many artifacts, but probably none as impressive like the Antikythera Device. Upon its discovery, the significance of the device was not identified. It took another decade approximately for archaeologists to determine what the device was used for, as well as the age. The device is estimated to be from the very first century, B.C. The design of the Antikythera device was so ingenious that it is generally known as the "world's first analog computer."
Though the spur gear is the most widely used gear, there are other types of gears, for various usages. A spur gear is distinctive in that is has teeth that are straight, versus a gear that has angled teeth. A spur gear can be used along with other gears, or it can be used with a rack, which is a straight piece of metal that has teeth for the gear to hold onto. Since various kinds of gears produce different quantities of torque, it is important to select the correct kind of gear for a given project. Spur gears are being used in slower-speed applications, such as washing machines, fuel pumps, and blenders. Spur gears are simple, economical, and efficient, when used at slow speeds.
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Most engineers will come to a degree where they will really need to design gears for their undertakings. Spur gear drawing requires extensive training, and even a CAD program. The basic procedure involves drafting several circles that demonstrate the spur gear dimensions, and then carefully drawing a series of lines that can come from the center point, to map out where teeth will need to be cut. Once a gear has been created to the correct specifications for a project, it can be ready to be milled.
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Most gears are made on a hobbing machine. A hobbing machine is a special piece of equipment that mills gears, as well as sprockets as well as splines. Hobbing machines have been used for some time, but are still used more often than any other gear-producing machine, due to the accuracy and relative low cost. Alternative methods of development include casting, broaching, and for plastic gears, injection molding. Most metal gears need to be heat-treated to preserve the material durable enough to resist wear. The type of venture that the gear is being used for will determine the suitable material from which to mill the gear. Steel is usually the most durable and cost-effective material, and can be used where corrosion would be of concern, for instance on a can opener.
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