Machine Design
When bevel gears having equal teeth and equal pitch angles connect two shafts whose axes intersect at right angle, then they are known as

Internal bevel gears
Crown bevel gears
Miter gears
Angular bevel gears

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Machine Design
The flank of the tooth is the

Surface of the top of the tooth
Surface of the tooth below the pitch surface
Surface of the tooth above the pitch surface
Width of the tooth measured along the pitch circle

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