I'm making mechatronic Dr Octopus arms (they're gonna be pretty sweet), and I'm in the process of prototyping the segments. They'll be roughly 2.5 cm in height, with a 2.5 cm gap from segment to segment, and they need to be attached securely, with smooth rotation on xyz to ≈ 10°. Planning on housing the servos in the base, and running cables down the arms to actuate them. Roughly 24 segments total, with separate control cables for the first 12 and second 12 (so the first half can bend in one direction, and the second half another), along with a drive cable down the center so it can rotate on the z axis. This also means I'll need some empty space running down the center of the segments to run the drive cable and the control cables for the second half, so they don't impede/aren't impacted by the bending of the first half.
As far as I can figure, spherical bearings are my only real option here. As a test, I bought 4 steel spherical bearings from Amazon to connect the segments. And man, I love these things. I'd never handled them before, and they are smooth as butter. Unfortunately, they were like $7/per, and I need around 100 of them. So, slightly more than I'm hoping to spend haha. Aliexpress has them for ≈ $1.50/per, but the shipping is obscenely expensive, and would take like 2 months.
So I'm trying to figure out another option. I'm a member of a local maker's space, so I have access to a bunch of tools (metal shop with lathe, CNC, FDM 3D printers), but still don't think I have a great solution.
The tools for making these the right way are obscenely expensive. I'm thinking I could machine the race in two halves and weld/clamp them around the ball, which would be a ton of work, and wouldn't be as smooth, but would probably be sufficient.
I could 3D print them, but I can't figure out a process that would be as smooth as I want. They'd need to be filled/sanded, probably coated with a dry lubricant. But the filling/sanding process would introduce tolerance issues, and I can't afford to have slop with how the cables will work.
Anyone have any insights here to help me out? Thanks!
It makes a lot more sense if you have the context from the Soulsborne games. The series started much simpler, with (mostly) linear progression, fewer weapons/abilities, and shorter "quests." Part of the appeal of those games was the mystery, and the community that grew around solving the unexplained quests/mechanics/lore. The games were shorter, and the maps smaller, so it was easier to explore on your own.
Then with Elden Ring, it just exploded with content, built around the same game play mechanics. For veteran Soulsborne players, it plays like the next title in the series. The only really novel mechanics are the open world and spirit ashes. The downside is (at least for me), the world is so large that it's a chore to explore everything. I finished my first play through and lost the will to start a +1 game. In contrast to Dark Souls 3, where I completed at least 6 play throughs.
But if you don't have that context...yeah i'd imagine Elden Ring is overwhelming in its complexity and scale. Trying to figure out Soulsborne mechanics and navigate this giant world with little direction sounds daunting. Pitting you against the grafted scion to die immediately, and right after putting the tree sentinel in your way, was a confusing way to start the game, even for me.