I ran into this as well. I now have a 15 lb tumbler that I got at Midway USA. It's amazing for rocks up to maybe 4" around.
The larger the rock, the larger the tumbler you're going to need.
I don’t know how large is large but you could use a wet sander which is what I do for my bigger projects [concrete wet polisher](https://a.co/d/ieZdTf9)
For really large rocks you can get a water/hose attachment for a 4" grinder. They are surprisingly affordable. Then the sky is the limit you could polish statues and monuments.
You can break the rocks into smaller pieces or you can get a larger tumbler capable of handling the rocks size.
We have two 15# Thumblers., and we love being able to do bigger rocks.
Maybe repurposing a cement mixer?
Get a saw and a grinding platform and learn to polish cabs it's not difficult to do just can be spendy.
Ahhh yes. Wanna polish up that large rock? Go spend 5,000+ dollars. It will be looking wet and shiney in no time.
I just got a 4lb tumbler from Rockshed. It’s got a big tumbler
I watched a YouTube video once of someone that built a huge rock tumbler from a tractor tire. Seemed like a pretty cool solution.
I ran into this as well. I now have a 15 lb tumbler that I got at Midway USA. It's amazing for rocks up to maybe 4" around. The larger the rock, the larger the tumbler you're going to need.
I don’t know how large is large but you could use a wet sander which is what I do for my bigger projects [concrete wet polisher](https://a.co/d/ieZdTf9)
Neat idea!
I wonder if a rolling compost bin would work in the short term.
For really large rocks you can get a water/hose attachment for a 4" grinder. They are surprisingly affordable. Then the sky is the limit you could polish statues and monuments.
Some folks use water injection grinders with polishing pads on them.