Real engineering parameters for evaluating shot blasting machine quotations and matching equipment to production requirements.
Throughput and Cycle Time
Throughput should be stated as accepted production at the required finish, not as empty machine speed. For batch systems, define kg per batch, blast time, load time, unload time, and expected batches per shift. For conveyor systems, define part size, line speed, loading gap, cleaning grade, and square meters or tons per hour.
A supplier estimate is only useful when it is tied to your part. The same machine can clean light rust quickly but slow down dramatically on heavy scale, casting sand, or complex geometry. Ask for sample blasting or a written cycle-time assumption.
Blast Wheel Power and Wheel Count
Blast wheel power is one of the strongest capacity indicators, but it does not work alone. Wheel count, wheel position, blade design, abrasive flow, hot spot shape, and part movement decide whether the energy reaches the surface. Standard table, tumblast, and roller machines often use wheels in the 5.5-18.5 kW range; larger fabrication and preservation lines may use higher-power wheels or many wheels.
When reviewing a quotation, ask for wheel motor power, number of wheels, recommended abrasive, rated abrasive flow, wheel access time, and expected blade life. A machine with easy wheel service may have better uptime than a machine with slightly higher installed power.
Abrasive Flow and Dust Collection
Abrasive flow commonly sits in the tens to hundreds of kilograms per minute per wheel, depending on wheel size and duty. Flow should be adjustable and repeatable. Too little flow wastes motor capacity. Too much flow overloads the wheel, increases wear, and can broaden the blast pattern.
Dust collection must be sized for cabinet volume, contaminant load, air leakage, media separator needs, and local exposure limits. Foundry sand and heavy scale require more dust-handling margin than clean automotive parts. Always review fan airflow, filter area, pulse cleaning, hopper discharge, and spark or fire protection where required.
| Parameter | Representative Range | What to Confirm |
|---|---|---|
| Throughput | 0.2-20+ tph | Accepted output at specified finish |
| Wheel power | 5.5-75 kW per wheel | Wheel count, position, access, blade life |
| Abrasive flow | 50-250 kg/min per wheel | Stable metering and media type |
| Dust airflow | Hundreds to thousands of cfm | Collector sizing and pressure drop |
| Surface profile | Rz 40-80 um common for coating prep | Measured acceptance method |