ABSTRACT
A spur gear, especially if an old design, will give a T. E. with a strong regular excitation at once per tooth and harmonics (Fig.. 3.1), even when loaded. The idea of using a helical gear is that if we think of a helical gear as a pack of narrow spur gears, we average out the errors associated with each “slice” via the elasticity of the mesh by “staggering” the slices.
