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GEAR DETAILS

V. Ryan © 2002 - 2010

The gears above are known as spur gears. The circle marked in red shows the outer limit of the teeth whilst the green circles are known as the pitch circles. The pitch circle of a gear is very important as it is used by engineers to determine the shape of the teeth and the ratio between gears (ratios will be explained later).
The pitch of a gear is the distance between any point on one tooth and the same point on the next tooth.
The root is the bottom part of a gear wheel.

The pitch point is the point where gear teeth actually make contact with each other as they rotate.

Draw a single gear wheel and label the following:
The root, pitch circle, pitch, pitch point.

Draw two spur gears meshing together (Hint - do not draw all the teeth, simply draw the gears with two circles representing each gear wheel - see earlier example)

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