Hi,
I have some issue with my Moon gear drive.
For the second time I broke 3 teeth on my gear, but not on the same side 
My setup is a 9" MTB with 100kv 6385 motors, 16s 70A per side and 5,5 ratio.
My backlash is perfect (20 years in R/C cars).
The first time, the bolts that hold the hub plate to the gear were a little bit loose.
My conclusion is that it created a small misalignment and it snaped under load. Helical require more precision than straight cut.
Moon was kind enough to send me a new gear for free because I explained him that I followed the instruction that says to not use loctite nor over torque.
I replaced the gear, I used loctite and more torque on the same bolts with a bearing inside the hub plate to improve the support and the correct amount of shims to be flush with the hub plate (most important point when you assemble those GD).
I did everything to make it bulletproof (well, that’s what I thought…)
I was on a trail, at around 10kph and suddenly, on the top of the climb, after my back wheels took off from the ground for 0.1s at slow speed I heard a snap when I “landed”. I was not full throttle, my wheels didn’t spin like crazy at all before hitting the ground.
Needless to say that i knew exactly what happened…
My question for you guys is : is POM gear not strong enough for my torquy setup ? 