Machine Design
When two non-intersecting and non-coplanar shafts are connected by gears, the arrangement is known as

Bevel gearing
Helical gearing
Spur gearing
Spiral gearing

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Machine Design
The face 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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