In every metal workshop, surface cleaning is a key step before painting, coating, or assembly. Different part shapes require different shot blasting machines. Two of the most common types are hook type shot blasting machines and tumble belt shot blasting machines. Choosing the right one will decide if your process is efficient or full of problems.
What is a Hook Type Shot Blasting Machine?
A hook type shot blasting machine is designed for medium to large parts that cannot tumble. Parts are hung on hooks, chains, or hangers, then transported into the blasting chamber. Turbines clean all sides by throwing high-speed abrasive.
- Best for heavy, large, or irregular parts
- No part-to-part collision
- Handles fragile surfaces or weldments
Common use: castings, automotive frames, welded structures, steel fabrications.
What is a Tumble Belt Shot Blasting Machine?
A tumble belt shot blasting machine is designed for bulk cleaning of small to medium parts. Components are loaded into a rubber or steel belt drum. As the belt rotates, parts tumble while turbines blast them from different angles.
- Best for small and medium batch production
- High efficiency with bulk parts
- Uniform cleaning by constant tumbling
Common use: bolts, nuts, gears, small castings, forgings.
What Are the Key Differences?
| Feature | Hook Type Machine | Tumble Belt Machine |
|---|---|---|
| Part Size | Medium to large, up to several tons | Small to medium, usually <15 kg each |
| Part Shape | Irregular, fragile, or welded structures | Simple, robust, can tumble without damage |
| Loading Method | Hook, hanger, chain conveyor | Bulk loading into belt drum |
| Collision Risk | Very low | Possible, since parts tumble together |
| Productivity | High for large, individual parts | High for bulk small parts |
| Typical Application | Castings, frames, weldments, heavy fabrications | Bolts, nuts, gears, small castings |
How to Decide Which Machine Fits Your Parts?
Ask yourself three questions:
What is the size of your parts?
- If they are big, heavy, or fragile → Hook type is better.
- If they are small and strong → Tumble belt is more efficient.
Do you process parts in bulk or one by one?
- Bulk cleaning → Tumble belt.
- Individual or irregular parts → Hook type.
What surface quality do you need?
- Both machines can reach Sa2.5 standard, but part geometry matters.
- Hook type gives more control for complex surfaces.
Why This Choice Matters?
Choosing the wrong blasting machine causes:
- Damaged parts (if fragile items tumble in belt machine)
- Low efficiency (if small parts are hung one by one in hook machine)
- High operation cost and wasted production time
Correct choice means better surface preparation, longer coating life, and reduced cost.
