[asid61]

That weird custom pulley thing can be made on a 4-axis CNC. However, do you really need it? Is it not possible to just modify some Vexpro pulleys to do the same thing?

To hold the bevel gear in place axially along the shaft, you have a couple options:

1. A screw clamping down on a washer on the end of the bevel gear shaft. This is pretty easy, and you only need something like a 4-40 screw, Then use a spacer on the bak of the bevel gear.

2. E-clips or circlips. Both are good. I prefer e-clips because they are easier to mount, but they also need a deeper groove. Slap one on near the end of the shaft and you're good to go.

3. Roll pins. My least favorite option, as they are a PITA to get into a hole, but if you are up to the task go for it. Theya re very strong and hold position well.

Do not use set screws. There are still a lot of axial forces acting on the bevel gear due to their operation. Set screws can and will slip.