Operating the Thumler’s UV-10 Rock Tumbler
The Key to Success is the Right Amount of Water
This video shows how we operate the Thumler’s UV-10 vibratory rock tumbler. The key to success is adding just the right amount of water. You want just enough water to make the grit stick to the rock and lubricate the material for a vigorous tumbling action. Too much water will wash the grit from the rock.
It is very important to check the tumbler at least two or three times per day. You will need to add a few tablespoons of water to replace what evaporates and to thin the rock mud that will develop in the barrel. We provide complete instructions for running this machine below the video.
Instructions for Operating the UV-10 Vibratory Rock Tumbler
Getting Started with the UV-10 Tumbler
The first thing that we do is tighten the wing nut that holds the barrel on the machine and then load the tumbler barrel. The Thumler’s UV-10 vibratory rock tumbler is designed to process about ten pounds of material. The machine operates best when the barrel is about 3/4 full of material with the motor not running. To obtain the best tumbling action in the barrel, we always run our rocks with at least ten to twenty percent small ceramic cylinders. The ceramic cylinders act as roller bearings in the tumbler barrel and improve the tumbling action of the angular rock material. They also keep larger pieces of rock from hammering the bowl and making a lot of noise.
The Thumler’s UV-10 tumbler uses a lot less grit per pound of rock than a rotary tumbler. For the first grinding step we add about six ounces of medium silicon carbide grit to a barrel that is about 3/4 full. The proper size grit is 180 mesh, but medium 150/220 ungraded grit (or a similar size) will work just fine.
[Note: Coarse grit is not used in a vibratory tumbler. The particles are too large to cling to the rocks. Medium grit is always used for the first grinding step.]
After you add the grit you can turn on the machine. Now start adding water, one tablespoon at a time. Take your time adding the water and watch how the grit clings to the rock. Your goal is to have just enough water to make the grit stick to the rock and produce a nice tumbling action in the barrel. If you add too much water the grit will not stick to the rock. Instead it will wash off and fall to the bottom of the barrel. If the grit starts washing off or if you see water splashing then you have added too much. Add water slowly to avoid this.
After adding the water, place the lid on the machine and tighten the wing nut securely.
[Note: It takes a little experimentation to learn how to use this tumbler. The amount of water needed varies. The proper amount depends upon the size, shape and volume of rocks in the barrel. Don’t hesitate to experiment and keep records!]
Check 2 to 3 Times Per Day
It is very important to check the tumbler at least two or three times per day. As the machine runs, some water will evaporate and a thick rock mud will start to accumulate in the bowl as the rocks are worn down by the grit. This rock mud will slow the tumbling action. When you see this add water one tablespoon at a time. You want to add just enough water to dilute the mud and restore a vigorous tumbling action. Don’t add too much!
How Long to Tumble?
We run this first step for about three days. Then we rinse the rocks in a plastic colander over a large plastic bucket. (Don’t allow the rock mud to go down the drain. It will clog your plumbing!) We then inspect the rocks to see if they have been smoothed to our satisfaction. If they need more smoothing, we rerun in medium grit for about three more days. If you are really picky about producing perfectly smooth rocks or you are tumbling hard, tough materials this first step might be run two or three times.
Pre-polish and Polishing Steps
After you run the rocks in medium grit it is time for the fine grit, or pre-polish. For pre-polishing, we run the rocks two or three days in 3 ounces of fine 500 or 600 mesh silicon carbide grit and enough water to make the grit stick to the rocks. We continue to check the tumbler two or three times per day and add water when needed. Two full days is usually enough unless you are tumbling really tough materials. Clean the rocks and barrel thoroughly after the pre-polish. Remember to rinse the rocks in a colander over a plastic bucket and don’t let used grit or rock mud go down the drain.
For the polishing step we have great results running the rocks for two or three days in 3 ounces of TXP aluminum oxide polish and enough water to make a milky coating on the rocks. TXP costs a lot less than cerium oxide or tin oxide and produces great results on agates, jaspers and most other materials that we have tumbled. After two days remove a few rocks, rinse them, and dry them to inspect their polish. If the polish is satisfactory then you are finished. If not, put the rocks back in the barrel and run it for another day.
When we are ready to stop the tumbler for clean-up we usually give it two shots of Dawn Direct Foam soap and allow to run for an additional two to five minutes. The soap foams up on the rocks and liberates the grit and mud clinging to them. It is then much easier to rinse them clean. Be careful in your selection of soaps. They might contain abrasives or leave deposits on the rocks. We have not had any problems with Dawn Direct Foam.
What We Like About the UV-10 Tumbler
We really like the Thumler’s UV-10 tumbler. It smooths and polishes rocks much faster than a rotary tumbler and it uses a LOT less grit and polish – about half of what you would normally use. It can also easily tumble rocks up to two inches in diameter or larger. We tumbled some igneous stream cobbles that were up to 3 1/2″ x 2 1/2″ x 2″ thick. The barrel can accommodate two or three of these large rocks if you have them swimming in smaller material and ceramic cylinders. Here’s a photo of some igneous and metamorphic rocks that we tumbled in the UV-10.
What We Dislike About the UV-10 Tumbler
OK… to be fair we want to tell you what we don’t like about the Thumler’s UV-10 vibratory tumbler. It is louder than any other tumbler that we sell. The amount of noise depends upon the amount and size of rocks in the barrel and how smoothly they are tumbling. Large rocks (two inches or larger), less than a full load in the barrel, or inadequate water will produce extra noise. Make sure that you have small pieces of rock or small ceramic media to cushion larger rocks – we always run about 25% small ceramic media to keep the large rocks from hammering the bowl and improve the tumbling action.
We think that this tumbler is louder than most people will want to have running in their house. So, you will need a garage, an outbuilding or a well-insulated basement where a loud HUM will not cause a problem. We have found that adding just one shot (JUST ONE!) of Dawn Direct Foam soap will significantly reduce the amount of noise. However, it will also slightly decrease the effectiveness of the grit at cutting the rock. Don’t add more than one shot of soap or you will be cleaning up a frothing mess!