Media tumbling is a surface finishing process that uses abrasive media and a tumbling action to improve the texture and appearance of machined parts.

Media tumbling enhances part appearance, smooths surfaces, removes burrs, and can create a matte or polished finish.

Media tumbling is suitable for various materials, including metals, plastics, and ceramics.

There are two common types of media tumbling processes in CNC machining, magnetic tumbling and vibratory tumbling.

Magnetic Tumbling: Magnetic tumbling typically uses stainless steel pins or small abrasive particles mixed with water and a compound. It is well-suited for materials like stainless steel, aluminum, and other metals.
Vibratory Tumbling: Vibratory tumbling can use a variety of abrasive media, including ceramic, plastic, or organic materials like walnut shells or corn cob. The choice of media depends on the material being processed. Ceramic media is often used for metals, while organic media is gentler and suitable for plastics or delicate materials.