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The Thumler's Tumbler Model A-R1 is a small rotary tumbler with a molded rubber barrel that holds a 3 lb total load, media and workpieces included. Its continuous-duty motor is built for long unattended runs, and the rubber barrel quiets the machine and cushions parts. It handles burnishing with steel shot, deburring and surface cutting with plastic or ceramic media, and lapidary rock tumbling with silicon carbide and cerium oxide. It suits jewelers, metalsmiths and hobbyist rock tumblers who want a compact, US-made unit; its 3 lb capacity is small next to larger rotary and vibratory tumblers, which finish faster but cost more and take up more space.
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Lowest price we've seen: $171.84 on Nov 13 at FindingKing. Tracked across 4 stores since Nov 13.
The Thumler's Tumbler Model A-R1 is a compact rotary tumbler for jewelry, metalsmithing, and lapidary work. It has a continuous-duty motor, so it can run long cycles unattended. The molded rubber barrel cushions parts and reduces operating noise.
It can burnish with stainless steel shot, water, and a small amount of burnishing compound, run for several hours to work-harden and brighten surfaces. For more aggressive surface refinement, use plastic or ceramic media with a detergent compound. For lapidary rock tumbling, run progressive stages with silicon carbide grits, then finish with cerium oxide.
Do not exceed the 3 lb total load of media, parts, and liquid combined. Rinse the media and barrel thoroughly after use to prevent grit carryover when switching between finishing processes. Rotary tumbling is the slowest mass-finishing method and is not ideal for final polishing of broad, flat surfaces.
