If you've spent any time looking for a faster way to polish stones, you've likely come across the lot o rock tumbler and wondered if it actually lives up to the hype. Most people start this hobby with a traditional rotary tumbler—the kind that looks like a little barrel and rolls around for weeks on end. Those are great, don't get me wrong, but they take forever. If you're the impatient type (like me), or if you've got a mountain of rough stones sitting in your garage that you want to see finished before next year, a vibratory tumbler is a game-changer.
The Lot O is a bit of a legend in the rockhounding community. It's a vibratory tumbler, meaning instead of tumbling rocks over each other in a heavy barrel, it vibrates the whole load at high speeds. This creates a friction that polishes the stones in a fraction of the time. But it's also a bit of a quirky machine. It's not exactly "plug and play" in the way a cheap plastic toy from a big-box store might be. It requires a little bit of setup and a decent understanding of how slurry works, but once you dial it in, the results are honestly spectacular.
What Makes the Lot O Different?
The first thing you'll notice about the lot o rock tumbler is that it doesn't look like most other tumblers. It's got this red frame, some heavy-duty springs, and a plastic cap that sits on top. While a rotary tumbler might take four to six weeks to go from "jagged rock" to "shiny gem," the Lot O can often do the same job in about a week.
Because it vibrates rather than tumbles, the rocks don't crash into each other with as much force. This is a huge plus if you're working with more delicate materials or if you want to keep the original shape of the stone. A rotary tumbler will eventually turn every rock into a rounded bean shape. The Lot O, however, follows the natural contours. If you have a cool-looking piece of agate with interesting jagged edges, the vibratory action will polish those edges rather than grinding them flat.
Setting It Up Right
I'll be honest: the first time I set mine up, I didn't realize how much it wanted to move. You can't just set a lot o rock tumbler on a workbench and walk away. If you do, you'll come back ten minutes later to find it's vibrated itself right off the edge and is currently doing its best impression of a jackhammer on your garage floor.
Most people mount theirs to a heavy cinder block or a thick piece of plywood that is then weighted down. I personally went the cinder block route. I used some industrial-strength outdoor mounting tape to stick the base to the block, and then I put the whole thing on a rubber mat to dampen the noise. It sounds like a lot of work, but once it's mounted, it's solid. It stays put, and the vibration is transferred into the rocks where it belongs, rather than into your floorboards.
The Secret is the Slurry
When you're using a rotary tumbler, you usually fill it with a lot of water. With the lot o rock tumbler, you have to be much more precise. You're looking for a specific "slurry" consistency. If you add too much water, the grit just sinks to the bottom and doesn't do much. If you don't add enough, the rocks get gummy and stop moving.
The goal is to have the rocks look "wet and shiny" but not submerged. When you turn the machine on, you should see the rocks at the top slowly circulating down while the ones on the side move up. It's almost hypnotic to watch. I usually start with just a few tablespoons of water and add it drop by drop until the movement looks right. It takes a little practice to get the feel for it, but once you see that perfect "roll," you'll know exactly how to replicate it next time.
Choosing Your Grit
One of the best ways to use this machine is in combination with a rotary tumbler. A lot of folks (including me) use a rotary for Stage 1 (the coarse grind) because the Lot O isn't great at removing large amounts of rock material. It's a "finishing" machine.
So, I'll run my rocks in a rotary barrel with 60/90 grit for a week or two to get the shapes I want. Then, I'll move them over to the lot o rock tumbler for the medium, fine, and polish stages. In the Lot O, these stages usually only take about 24 to 48 hours each. It cuts the total processing time down by weeks.
Noise and Placement
Let's talk about the elephant in the room: the noise. Vibratory tumblers aren't necessarily louder than rotary ones, but the type of noise is different. A rotary tumbler makes a low-frequency rumbling sound, like clothes in a dryer. The Lot O makes a high-frequency hum. It sounds like a giant beehive is living in your shed.
Because of this, you probably don't want it running in your kitchen or right outside your bedroom door. A garage, a basement, or a dedicated workshop is the way to go. If you've mounted it to a cinder block on a rubber mat like I mentioned earlier, the noise is actually pretty manageable. It's more of a background buzz that you eventually stop noticing.
Maintenance and Longevity
The Lot O is built like a tank, but it does have a few wear parts. The springs can eventually get tired, and the motor needs to stay clean. The most important thing you can do to keep it running for years is to avoid overloading it. It's tempting to cram as many rocks as possible into that little tub, but if the motor is struggling to move the mass, you're going to burn it out.
Also, make sure you're cleaning the tub thoroughly between stages. Because the vibratory action is so fast, even a tiny bit of leftover coarse grit can ruin your final polish. I like to give the rocks and the tub a good scrub with a soft toothbrush and some dish soap before moving on to the next grit. It's a bit of a chore, but it's the difference between a "pretty good" shine and a "holy cow, I can see my reflection" shine.
Why Enthusiasts Love It
You might wonder why people spend the extra money on a lot o rock tumbler when there are cheaper options out there. It really comes down to the quality of the finish. There is something about the way a vibratory tumbler works that produces a deep, glass-like luster that is hard to achieve with other methods.
It's also surprisingly efficient with grit. Because you aren't using nearly as much water, the grit stays in contact with the stones more consistently. You end up using less material over the long run, which helps offset the initial cost of the machine.
Final Thoughts on the Lot O
If you're just starting out and you aren't sure if rock tumbling is going to be a lifelong hobby, a cheap rotary tumbler is a fine place to begin. But if you've already got the "rock bug" and you're tired of waiting a month to see your treasures finished, the lot o rock tumbler is an investment you won't regret.
It's a specialized tool for people who want high-quality results and want them relatively fast. Yes, you have to mount it to a block, and yes, you have to baby the water levels a bit, but the first time you pull out a handful of shimmering, mirror-polished agates after only a few days of work, you'll be hooked. It turns the hobby from a test of extreme patience into something much more active and rewarding. Just remember to keep an eye on that slurry, keep your springs clean, and maybe buy some earplugs if you're planning on keeping it in the house!