The spiral bevel gearbox design involves 2 gears mating at 90 degrees. The gears like to run away from each other, so to maintain contact the support structure is critical for best performance. The internal gear and bearing design requires understanding of radial and thrust forces.
Rototime Spiral Bevel Gear>> https://vimeo.com/592260804
Rototime Gearbox Design
Gearbox inside Basic
