General: Spur gears are the most commonly used gear. They are characterized by teeth which are parallel to the axis. The basic descriptive geometry for a spur gear is shown in Figure 15.18.
Advantages: Spur gears are easy to find, inexpensive, and efficient.
Limitations: Spur gears generally cannot be used when a direction change between the two shafts is required. Also, this type of gear is used for smaller speed due to noise creation at high speed power transmission.
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