I tried to make a 60° 3:1 bevel gear transmission. I used part-design to make the base geometry and at the end I used an intersection of the geometry with the bevel gear from the gear-wb to cut the teeth. This procedure works quite good, but there might be some better solutions. The boolean intersection for the bigger gear needs quite some time.
Also I have found a error with the clearance. This should work with the latest code from git. But still it is very difficult to set the right amount of clearance. There should be a better way to set this.