Yes, the right tumbling media can reach some small holes, grooves, and internal corners, but media size and shape are critical.
If the media is too large, it may not enter narrow openings. Smaller media can reach more complex areas and provide better contact with internal surfaces.
Media shape also affects accessibility. Triangular, cylindrical, and other specially shaped media can create different contact patterns during finishing.
However, extremely small passages may require specialized processes such as magnetic pin polishing rather than conventional barrel or vibratory finishing.
When selecting media, manufacturers should consider the smallest opening of the workpiece, hole depth, geometry, and required finishing result.
A practical sample test can determine whether conventional mass finishing media can effectively reach the target areas without becoming trapped inside the component.
