A buyer-focused guide for specifying shot blasting machines based on workpiece type, production volume, surface finish, utilities, and supplier evidence.
Specify the Workpiece First
A useful RFQ starts with workpiece facts: material, size envelope, weight, geometry, contamination, temperature, sensitivity to impact, and whether the part can retain abrasive. Include drawings and photos from several angles. If the part family varies, define the minimum, average, and maximum cases.
Do not let chamber size become the only specification. The machine must expose the surfaces that matter. Complex castings, weldments, and profiles may need rotation, multiple wheels, special fixtures, blow-off, or post-blast media removal.
Match Production Volume and Finish
Define production volume as accepted output per hour or shift. For coatings, specify cleanliness and profile. For peening or fatigue improvement, specify coverage, intensity, media, and process controls. For cosmetic finishing, define acceptable color, brightness, and defect limits.
A supplier should be able to state the assumed cycle time, wheel arrangement, abrasive recommendation, dust collector size, connected load, and operator requirement. If the answer is generic, ask for a sample trial.
RFQ Checklist
A complete RFQ reduces quote ambiguity and prevents later cost surprises. Include site voltage, available compressed air, foundation limits, noise expectations, dust discharge rules, crane or forklift access, and desired automation interfaces.
Ask every supplier for a two-year spare parts list, critical spare lead times, blade change procedure, liner access, dust filter details, warranty terms, installation scope, and commissioning acceptance tests.
| RFQ Item | What to Provide | Why It Matters |
|---|---|---|
| Part data | Drawings, photos, material, weight | Drives handling and chamber design |
| Finish target | Cleanliness, Ra/Rz, coating spec | Defines blast intensity and media |
| Production volume | Parts/h, tph, shifts/day | Determines wheel power and automation |
| Site data | Voltage, air, floor, dust rules | Prevents installation surprises |
| Commercial scope | Spare parts, training, install | Makes quotes comparable |