Spur Gear - What Is A Spur Gear?

You may not know what a spur gear is upon hearing the word, but you are probably much more accustomed to them than you think. Mechanical gears have played an incredibly important role in the history of machining, and are 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 produce force, known as torque. When a gear is employed with one or more additional gear set, it becomes a simple machine known as a transmission. The simplest type 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 called the Antikythera Device, which was used to evaluate astronomical positions. It was discovered in 1900 when divers discovered a shipwreck off of the Greek island of Antikythera. The shipwreck location produced many artifacts, but probably none as compelling as the Antikythera Device. Upon its discovery, the significance of the device was not identified. It took another decade roughly for archaeologists to determine what the device was used for, and also the age. The device is estimated to be from the first century, B.C. The design of the Antikythera device was too ingenious that it is generally known as the "world's first analog computer."

Although the spur gear is the most commonly 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 with other gears, or it can be used with a rack, that is a straight piece of metal that has teeth for the gear to hold onto. Since different types of gears produce different amounts 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, as well as blenders. Spur gears are simple, cost effective, and efficient, when used at slow speeds.

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The majority of engineers will come to a degree where they will need to design gears for their projects. Spur gear drawing requires extensive training, and even a CAD program. The basic procedure involves drafting several circles that illustrate the spur gear dimensions, and then cautiously drawing a series of lines that come from the center point, to map out exactly where teeth will need to be cut. Once a gear has been created to the correct specifications for a project, it is ready to be milled.

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Most gears are produced 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 precision and relative low cost. Alternative methods of production include casting, broaching, and for plastic gears, injection molding. Nearly all metal gears need to be heat-treated to preserve the material durable enough to resist wear. The type of project that the gear is being used for will determine the appropriate 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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Spur gear dimensions - US
Traxxas 32P Spur Gear,72T:NR,NSP,TMX.15,2.5 TRA4472
Traxxas 32P Spur Gear,72T:NR,NSP,TMX.15,2.5 TRA447 Make:Traxxas
New:$2.01
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Spur and Bevel Gearing: A Treatise On the Principles, Dimensions, Calculation, Design and Strength of Spur and Bevel Gearing, Together with Chapters ... Tooth Forms and Methods of Cutting Gear Teeth
Spur and Bevel Gearing: A Treatise On the Principl Make:Ulan Press
New:$23.39
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Spur gear made of POM with hub module 3 48 teeth tooth width 25mm outside diameter 150mm
Spur gear made of POM with hub module 3 48 teeth t Make:Maedler
New:$79.53
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Atomik RC Spur Gear 45T for Metal Mulisha 1:18 RC Car
Atomik RC Spur Gear 45T for Metal Mulisha 1:18 RC Make:Atomik RC
New:$5.99
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San Antonio Spurs Single Shade Bar Lamp (14"/14", Black)
San Antonio Spurs Single Shade Bar Lamp (14-Inch/1 Make:TG
New:$51.62
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Spur and Bevel Gearing: A Treatise on the Principles, Dimensions, Calculation, Design and Strength of Spur and Bevel Gearing, Together With Chapters ... Tooth Forms and Methods of Cutting Gear Teeth
Spur and Bevel Gearing: A Treatise on the Principl Make:University of Michigan Library
New:$22.79
View University of Michigan Library
USA, Oregon, Seneca, Ponderosa Ranch. Cowgirl gear - US38 BJA0342 - Jaynes Gallery - 8x8 Inch Quilt Square
USA, Oregon, Seneca, Ponderosa Ranch. Cowgirl gear Make:3dRose LLC
New:$8.99
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Spur gear made of POM with hub module 0.7 18 teeth tooth width 5mm outside diameter 14mm
Spur gear made of POM with hub module 0.7 18 teeth Make:Maedler
New:$10.43
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Atomik RC 68T Spur Gear for MM 450 and VMX 450 RC Dirtbike
Atomik RC 68T Spur Gear for MM 450 and VMX 450 RC Make:Atomik RC
New:$5.32
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Spur and bevel gearing: A treatise on the principles, dimensions, calculation, design and strength of spur and bevel gearing, together with chapters ... tooth forms and methods of cutting gear teeth
Spur and bevel gearing: A treatise on the principl Make:University of Michigan Library
New:$21.84
View University of Michigan Library
 

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