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Thumler's A-R12 Rock Tumbler

Large Twelve-Pound Barrel

Thumler's 12lb rock tumbler

Age Recommendation
This is a large-capacity tumbler that should be used by adults.
Find out why.

A-R12 Rock Tumbler

MSRP $257.85
Only $199.95

Tumbler Only
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Thumler's Model A-R12 Rock Tumbler

This is a rock tumbler for the experienced person or for the beginner who has access to lots of rock. The metal frame and heavy-duty, overload-protected, maintenance-free motor easily turns the 12-pound capacity barrel.

If you fill the barrel about 1/2 to 2/3 full of rock as recommended it will process about nine pounds of rock. The soft rubber barrel will tumble your stones with a minimum amount of noise.

The A-R12 tumbler quickly converts from a large-capacity tumbler into a machine that turns two 3-pound capacity barrels (sold separately).

The tumbler is supplied with an instruction book that will guide you through tumbling your first batch of rock.

We want you to enjoy this hobby as much as we do.

This video shows how easy it is to convert the Thumler's A-R12 rock tumbler to a small-capacity two-barrel tumbler similar to the Thumler's A-R2 tumbler.

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.
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Gemstones of the World We highly recommend: Gemstones of the World (fifth edition) by Walter Schumann. One of the most popular gemstone books ever written, with over one million copies sold. It has about 100 pages of basic gemstone information and about 200 pages dedicated to photos and descriptions of over 100 gems and gem materials.

  Gemstone and Jewelry Book
Gemstone Tumbling, Cutting, Drilling and Cabochon Making We highly recommend: Gemstone Tumbling, Cutting, Drilling and Cabochon Making (by Jim Magnuson and Val Carver. This is our favorite book for a person who does rock tumbling and now wants to make beads, pendants and other jewelry from tumbled stones. Includes an introduction to cabochon cutting.

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