Comparison of tumblast, hanger type, table type, roller conveyor, and continuous shot blasting systems by workpiece handling and production fit.
Tumblast Machines
Tumblast machines use a rubber or steel belt to tumble small and medium parts under one or more blast wheels. They are used for castings, forgings, fasteners, heat-treated parts, brackets, and compact components that can collide without functional or cosmetic damage.
The commercial advantage is dense batch loading and simple operation. A tumblast machine can deliver a low cleaning cost per kilogram because many parts are exposed in one cycle. The limitation is part safety: thin, delicate, threaded, or precision surfaces may be damaged by tumbling.
Hanger Type Machines
Hanger machines suspend parts from hooks, rotating hangers, or overhead rails. The part rotates in the blast chamber so multiple faces pass through the hot spot. This design is common for irregular castings, frames, weldments, wheels, pump bodies, and mixed production.
Hanger type machines are often the best flexible choice for manufacturers with many part families. They cost more than a simple tumblast cell but protect non-tumbling parts and can accept crane-loaded work. Hook load, hook envelope, rotation quality, and hanger wear must be specified clearly.
Table Type Machines
Rotary table shot blasting machines place the workpiece on a table while one or more wheels blast from above or from angled positions. They are useful for heavy, fragile, flat, or awkward parts that need crane or forklift access.
A single-table machine is simple and economical for repair or low-volume production. A double-table design improves productivity because one table can be loaded while the other is blasting. Important parameters include table diameter, table load, wheel angle, door opening, and seal design.
Roller Conveyor and Continuous Systems
Roller conveyor machines process plates, H-beams, tubes, profiles, pipes, and fabricated structures in a continuous pass. Multiple wheels are arranged to cover top, bottom, and side surfaces. These systems are common in steel structure plants, service centers, bridge fabrication, shipbuilding, and preservation lines.
Continuous systems extend the same logic to wire mesh belts, monorails, drum machines, cylinder machines, pipe lines, and robotic cells. They are selected when high repeatability, stable takt time, and labor reduction justify the capital cost.
| Type | Best Fit | Main Limitation |
|---|---|---|
| Tumblast | Small bulk parts | Tumbling damage risk |
| Hanger | Heavy or irregular mixed parts | Loading time and hook utilization |
| Table | Crane-loaded heavy parts | Lower automation unless double-table |
| Roller conveyor | Plate, beam, tube, profile | Requires line space and stable flow |
| Continuous special | High-volume product family | Higher engineering and capital cost |