Tumbling
Tumbling (barrel finishing) rotates parts with abrasive media in a barrel to deburr, clean and smooth them in bulk. It is one of the simplest and cheapest mass-finishing methods for small, robust parts.
What it is
As the barrel rotates, parts and media slide over each other, removing burrs and rounding sharp edges. Wet or dry processes, and different media and compounds, give results from rough deburring to bright burnishing.
Tumbling is slower and more aggressive on part-to-part contact than vibratory finishing, so it suits sturdy parts.
Typical applications
- Deburring small stamped and turned parts
- Descaling and cleaning
- Burnishing brass and steel
- Edge breaking on fasteners and pins
- Pre-plating preparation
Suitable materials
- Steel
- Brass and copper
- Aluminium (gentle media)
- Plastics (selected)
Points to consider
- Delicate parts can be nicked by impact; vibratory finishing is gentler.
- Keep similar parts together to avoid mixing damage.
- Choose media that won't lodge in features.
- Rinse and dry to prevent corrosion.
Frequently asked questions
What is the difference between tumbling and vibratory finishing?
Tumbling rotates a barrel; vibratory finishing vibrates a tub. Vibratory is faster and gentler, tumbling is simpler and suits sturdy parts.
Is tumbling suitable for delicate parts?
Usually not. Fragile parts can be damaged by impacts; vibratory finishing is better.
Can tumbling brighten brass?
Yes, burnishing with steel media and compounds brightens brass and steel parts.