Bevel Helical GearboxBevel helical gearboxes are most often found in the power transmission industry. In this gearbox, the face of the gear on which the teeth sit is conical and the two axes of rotation intersect. The gear teeth are also not aligned with the axis of rotation, tracing a helical path. As a result of these two characteristics, the bevel helical gearbox allows the gears to mesh even when the shafts are not aligned. The shaft angle at which the gears can operate depends on the bevel and gear tooth angles.