That is the type of info we need, thanks
I am a layman and speak as a layman but when a chip is produced in a MRGB it is not because a gear is too soft but because it is too hard (brittle)
Obviously soft steel gears would not be used because they would wear out quickly so they harden them to a point where they have a long life at the risk of being brittle and designers walk a fine line trying to find the best balance.
In an earlier post I gave some (poor) examples of witnessing bearing races shatter from impact and I did not make my point properly so I will try a different slant ...
If planetary gears were made of mild steel we could place them on an anvil and hammer them flat and they
would never crack or break .... but if they were made of hardened steel they
would never bend or distort , they would shatter into several pieces
The failed gears in these MRGB's are never deformed , they break into several pieces as the photos show.