Practical ideas for surface preparation and machine selection.
Buying guide
The CE mark on a blast machine is a manufacturer's own declaration, not a third-party certificate. Here is what it legally covers, the four documents that must agree with each other, and the blast-specific hazards where conformity most often breaks down.
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Applications
Zinc does not bond to dirty steel, which makes hot-dip galvanizing self-checking. Where abrasive blasting fits in the degrease-pickle-flux chain, why preparation before galvanizing and touch-up after it demand opposite media, and how to size nozzles, airflow and dust collection honestly.
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Maintenance
Spent abrasive does not get used up, it gets finer. How sieve analysis, gravity air wash classification and disciplined top-ups keep a working mix cutting well instead of turning into dust.
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Process
Media choice decides cost per tonne, surface profile and how many castings get scrapped. A practical look at shot versus grit, SAE size bands, hardness grades, the cleanliness-versus-profile distinction, and the failure modes that show up in foundry and machine-shop blasting.
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Sizing a blast machine for long castings comes down to three numbers: the workpiece envelope, the required hourly output, and the finish you have to hit. Get those wrong and you either overpay for capacity you never use or undersize the chamber and fight the job forever.
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