Crab Drive

[AdamHeard]

It looks like a really solid start for a crab drive. You have the overall concepts down, but there is a decent amount of detail work that can be improved.

Even with the bottom support for the module, I wouldn't use such a small shaft for the module rotation: It could potentially be taking a lot of load. Also, what is your method for attaching the shaft to the module?

I would definitely get it welded. It will be stronger than those L brackets by far, and won't loosen like the bolts will (You'd have to be rechecking the bolts constantly to be safe).

There doesn't seem to be a tensioner for the steering chain loop, what do you plan on doing?

I would try to make the bottom row of outer extrusion extend all the way into the corners for maximum strength. I see how it may interfere with that ring some, but you'll have to work that out. Since you are taking a lot of the module's load at the bottom with that turntable, the structure really needs to be strong there. I can see how the plate would strengthen it, but I would have the extrusion go the whole way just to be sure.


Don't let my comments get you down, it is definitely a promising start.

Good luck, and keep it up until you get a truly great design.