Threaded rods, timing belts, or long bolts (ie cheap threaded rods). I’m leaning towards bolts, not just for price, bit too see how accurate it could be. Especially if I added in some profiling of the bolt itself, it might be perfectly accurate for what I’m doing.
I’ll never understand why I’m so irrationally against timing belts. It’s not like I have a rain for my bias, never having designed anything using timing belts out threaded rods. It’s just something about them. Maybe it’s the perception of slop. Lord knows I never think slop sounds appealing. Come get it, fresh slop, dinner time! Nope, not tasty.
So bolts it is.
Peter's stuff.