Straight bevel gears are the simplest of the bevel gears. They are manufactured on precision generating machines by indexing method ensuring that the teeth should be of tapered depth and thickness. Teeth are cut on the outside of the cone. They have a straight tooth geometry, which if extends, passes through the intersection of their axes.
Straight bevel gears angle can also be with one gear flat with a pitch angle of 90 degrees. These have conical pith surfaces that operate on intersecting axes. They can be designed and cut to operate on any shaft angle. In straight bevel gears when each tooth engages it impacts the corresponding tooth and simply curving the gear teeth can solve the problem.