Unlike pitch plane motions, the lateral modes involve both roll and yaw motion.
2.
The former is used in the pitch plane.
3.
The pitch plane of a rack or crown gear is also the pitch surface.
4.
A pitch plane in an individual gear may be any plane tangent to its pitch surface.
5.
The "'transverse plane "'is perpendicular to the axial plane and to the pitch plane.
6.
A "'normal plane "'is normal to a tooth surface at a pitch point, and perpendicular to the pitch plane.
7.
The "'pitch plane "'of a pair of gears is the plane perpendicular to the axial plane and tangent to the pitch surfaces.
8.
The pitch plane of a rack or in a crown gear is the imaginary planar surface that rolls without slipping with a pitch cylinder or pitch cone of another gear.
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