A practical method for testing blasting efficiency, cycle time, coverage, first-pass acceptance, and bottlenecks in shot blasting operations.
Build a Test Plan
A blasting efficiency test should define part type, initial surface condition, target cleanliness, target profile, abrasive type, wheel settings, and inspection method before the trial starts. Without a fixed target, the test becomes a subjective demonstration.
Run enough parts to include loading, blasting, unloading, inspection, and reblast. For batch systems, record each batch. For conveyor systems, record line speed, loading gaps, part spacing, and rejected areas.
Measure the Right Values
Useful values include parts per hour, tons per hour, square meters per hour, first-pass acceptance, wheel amperage, abrasive top-up, dust pressure drop, and operator time. Capture photos of representative before and after surfaces and keep roughness readings with the trial record.
When efficiency is low, identify whether the bottleneck is wheel intensity, wheel coverage, loading labor, separator performance, dust visibility, part carryout, or inspection rework. Each root cause leads to a different equipment decision.
| Test Metric | How to Record It | Decision It Supports |
|---|---|---|
| Cycle time | Minutes per batch or pass | Machine capacity |
| First-pass acceptance | Accepted parts divided by total parts | Quality stability |
| Wheel amperage | Average and peak amps | Wheel loading and media flow |
| Surface profile | Ra/Rz readings | Coating readiness |
| Reblast time | Minutes per shift | Hidden productivity loss |