Spur Gears are the most common type of gear and are known as the slow speed gears. The teeth move radially on the disc, transmitting power between the parallel axes.

Spur Gears are the most common type of gear and are known as the slow speed gears. The teeth move radially on the disc, transmitting power between the parallel axes.

Occasionally, many spur gears are used at once for torque multiplication (usually for gear reduction) or resolution and accuracy improvement for positioning systems. The main reason for the popularity of spur gears is their simple design and ease of manufacture. However, spur gears mate only one tooth at a time, resulting in large amounts of stress on the gear teeth and noisy operation.