Practical ideas for surface preparation and machine selection.
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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Selection guide
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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