How to troubleshoot media breakdown and excessive wear

Diagnose and resolve common media wear issues — including premature breakdown, glazing, and incorrect consumption rates.

Normal vs abnormal media wear

All finishing media wears down over time — this is normal and expected. As media wears, the abrasive particles within it are continuously exposed, maintaining cutting action. However, abnormal wear patterns indicate a process problem that needs addressing.

Common media wear problems

Premature breakdown

If media is breaking into small fragments or wearing down much faster than expected, the likely causes are:

• Bowl amplitude set too high — reduce amplitude
• Load ratio too low — too many components, not enough media causing impact forces
• Wrong media type for the application — media too soft for the cut required
• Compound pH incorrect — some compounds are corrosive to certain media binders

Media glazing

Glazed media feels smooth and has lost its cutting ability. The surface has become polished rather than abrasive. Causes include:

• Compound flow rate too high — excessive lubrication prevents abrasive action
• Cycle time too long without compound — media surfaces become burnished
• Wrong compound for the media type

Media loading (part material embedding into media)

This occurs when workpiece material — particularly soft metals like aluminium or copper — becomes embedded in the media surface, smearing and staining components. Solutions:

• Use a compound specifically formulated for the material being processed
• Ensure compound flow rate is adequate
• Reduce cycle time and check results at shorter intervals

When to replace media

Replace media when it has worn down to approximately 50% of its original size, or when cut rate has noticeably reduced even after compound and amplitude adjustments. Keep a log of media top-up quantities — a sudden increase in consumption indicates a process problem.