| 摘要 |
A vibratory burnishing machine includes a drum which is supported on a table for vibratory movement. A frame on the drum includes a rotating counterweight which during rotation imparts vibratory movement to the drum. The vibratory movement is imparted to burnishing media in the form of steel balls or shot which burnish metal articles within the drum. The machine is particularly adapted for polishing small articles of flat and circular configuration such as coins by the combination of an open end cylinder which is freely moveable in the drum in response to movement of the burnishing media.
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