Plastic gears are quiet and lubricate themselves. but they're inferior in nearly every other way. The materials mentioned are as much the past as the future. H

Plastic gears are quiet and lubricate themselves. but they're inferior in nearly every other way. The materials mentioned are as much the past as the future. High tech polymers like Delrin and nylon have been in use for decades and saturate their markets already. These "future" gears have been around forever.