pressure angle
the angle at a pitch point between the line of pressure which is normal to the tooth surface, and the plane tangent to the pitch surface
en-GB/ˈpɹɛʃə ˈæŋɡəl/
en-US/ˈpɹɛʃɚ ˈæŋɡəl/
the angle at a pitch point between the line of pressure which is normal to the tooth surface, and the plane tangent to the pitch surface