pic: Shaker 2011 Arm Gearbox (Maybe?)

[Chris is me]

Originally Posted by squirrel

what if you were to use 1/8" stock for the sides? Have you done any loading or deflection calculations that show that the thicker stuff is actually needed?

Nope, none at all. The 1/4" is heavily pocketed on the inside and is mainly used as a shim to prevent that bearing right next to the Planetary from sticking out. I figured that worse comes to worst, a little overkill on such a vital part of the robot wouldn't hurt.

This is designed to interface with a 16 tooth hex sprocket to a 54 tooth sprocket, both available in 25 chain size on AM's website. I think if I did a bit more work we could squeeze a stage of reduction out of the gearbox by using a larger sprocket reduction - I can't figure out how to right now but that could save a lot of weight. Either way, this puts less load on the chain by doing more "work" in the gearbox.

I don't see why this couldn't be integrated into the side of the arm - the only thing is that the 50 / 56 tooth gears are more than 2 inches wide so they'd stick out.

Pocketing the middle 50 tooth gears brings this box down to about 4.2 pounds.