Angle Grinders & Abrasive Wheels Safety

Why must the Maximum RPM stamped on an abrasive wheel ALWAYS be equal to or higher than the grinder's No-Load RPM?

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 Correct IncorrectMounting a wheel rated for 6,000 RPM on an 11,000 RPM grinder subjects the outer diameter to centrifugal forces exceeding bonding strength, causing catastrophic centrifugal burst.

Why must the Maximum RPM stamped on an abrasive wheel ALWAYS be equal to or higher than the grinder's No-Load RPM?

• The wheel will melt into liquid plastic
• Centrifugal force increases with the square of speed, causing an under-rated wheel to burst into shrapnel
• It will cause the grinder to blow a 15A fuse
• It causes reverse thread spin-off