Definition of tumbling barrel in US English:

tumbling barrel

(also tumbling box)


  • A revolving device containing an abrasive substance, in which castings, gemstones, or other hard objects can be cleaned and polished by friction.

    • ‘In tumbling barrels, the friction is created by gravity as the media slides across the diameter of the barrel.’
    • ‘To tumble stones: place rough rocks or minerals in the tumbling barrel, add a rough grit, and turn on the motor.’
    • ‘These are complete Lortone tumbling barrels including the barrel, inner lid with liner, and the outer lid with knurled nut.’


tumbling barrel

/ˌtəmb(ə)liNG ˈberəl/