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Lot-O-Tumbler Vibratory Rock Tumblers


Widely known as "Uncle Tom's Calway Lot-O-Tumbler"

Lot-O-Tumbler vibratory tumblers
Age Recommendation
This is a large-capacity tumbler that should be used by adults who are mechanically inclined.Find out why.

Single-Barrel
Lot-O-Tumbler

Only $349.99

Adult signature required upon delivery.


Twin-Barrel
Lot-O-Tumbler

Temporarily UnavailableMore Information

Vibratory Tumbler Grit Kit


Grit kit vibratory tumblers
Includes two pounds of 150/220
medium grit, one pound of 500F fine
grit and one-half pound of #61 Rapid
Polish. Enough for many batches.
More Information / Larger Kits
Only $35.99

Lot-O-Tumbler Vibratory Tumblers



  • Tumble about four pounds of rock per barrel
  • Tumbles rocks up to about 2 1/4" in diameter
  • Run in medium grit until stones are smoothed
  • To check progress, open the lid, pull out a rock
  • Two days in fine grit to prepare for polish
  • Two days in polish for most polishable stones
  • Uses about 1/2 as much grit/polish as rotary
  • Save on grit, polish, electricity and time
  • Durable rubber barrels last a long time
  • Vibrates at over 2500 VPM
  • Motor is 0.07HP
  • Must be attached to a concrete block
  • See how we use the Lot-O-Tumbler in this video
  • Lot-O-Tumbler's 90-Day Guarantee
  • Guarantee begins on the date of purchase.


  • When we used the Lot-O-Tumbler for the first time, we were really surprised. It doesn't look like a tumbler, but it processed our rocks quickly and produced an awesome polish! The machine makes the load of rocks vibrate very rapidly and churn through the barrel with a thin film of grit on them. That thin film of grit turns every rock-to-rock contact into a rapidly-vibrating point of abrasion. The surface of every rock in the barrel turns into instant sandpaper!

    The Lot-O-Tumbler is fast. It will process a batch of rocks from rough to polish in under a week if you rinse the rock and add new grit every 12 hours. That is an easy job, you just lift the barrel off of the machine, pull off the red cap, fill the barrel with water, invert the barrel to drain, rinse again, add grit, and place the barrel back on the machine. Watch our video below to see how easy it is.

    NOTE: As with any tumbler, don't allow the used grit and mud to go down a drain - it can clog your plumbing.

    Only three abrasives are needed. We use medium grit silicon carbide (220 or 150/220 grit), fine grit silicon carbide (500 or 600 grit) and polish (we have obtained great results on agate and jasper with inexpensive TXP aluminum oxide polish. The instructions that come with the machine give specific suggestions for other materials.

    The Lot-O-Tumbler uses very little grit and polish - less than 1/2 the amount of abrasives that you would normally use for the same amount of rocks in a rotary tumbler.

    ***   Lot-O-Tumbler's 90-Day Guarantee   ***

    With a Lot-o-Tumbler you will save lots of money on grit and you will produce a load of finished rocks in under seven days - that's a lot faster than one month minimum in a rotary tumbler. That short tumbling time will save electricity too!

    ***   Learn how we use a Lot-o-Tumbler   ***

    Here are the downsides for some people: 1) the Lot-o-Tumbler must be attached to something heavy; and, 2) it makes a little more noise than a rotary tumbler - it hums!

    We got a standard concrete block, painted it to make it look nice, then used "Goop" to glue a single-barrel machine to the block. It works great. Many people use super double-stick tape strips supplied with the tumbler. The instructions recommend gluing the single-barrel machine to a standard 40-pound concrete block (we filled the holes in our block with concrete for extra weight). They recommend gluing the two-barrel machine to a 100-pound block or a concrete floor!

    You can see our Lot-o in operation in the video below. We run ours in a small room in our garage and think that the noise sounds like we are sitting in the cabin of a small commuter plane - but not quite as loud. If you have a shed or garage where a little noise will not be a problem, then the Lot-o-Tumbler will work great for you. We run a single Lot-o-Tumbler in a garage that is below our bedrooms. We turn it on in the morning and let it run all day, rinse the rocks before bedtime, and leave it off for the night. With that schedule we can polish many types of rocks from start to finish in a little over a week.


    As with other vibratory tumblers, the Lot-O-Tumbler "smoothes" the surface of the rocks and does minimal rounding. If you like your tumbles nicely rounded, just run them for one or two weeks in a rotary machine and finish the job in the Lot-O-Tumbler. Here is how we use the Lot-o-Tumbler. If you have a rotary tumbler that produces four pounds of rounded rock per week, then you can run both machines and finish a load of nicely-rounded tumbles every seven days. You will be running a gemstone factory!

    For Best Polishing Results:

    If you are really serious about getting a high quality polish we recommend getting a separate barrel and using it exclusively for the polishing step. A dedicated barrel for polish (and a thorough cleaning of your rocks after the 600 grit step) will help avoid grit contamination of your polishing step.