One potential source of serious injury in grinding comes from an oversight that is easy to make: operating the wheel in an over-speed condition. While a wheel that is run far enough in excess of its rated maximum speed may shatter within minutes of operation, northernindustrialtools16instraightlineairsandermodel15772 danger may also result from a wheel run just slightly faster than its rated speed. This less severe over-speed northernindustrialtools16instraightlineairsandermodel15772 condition can cause the northernindustrialtools16instraightlineairsandermodel15772 wheel to be damaged, and the damage may result in breakage after further use. For example, operating a reinforced, 9-inch diameter, Type 27 wheel rated for a maximum speed of 6,600 rpm on a 7-inch angle grinder with a speed of 7,700 rpm can cause the wheel to crack. This cracking can lead to breakage later. northernindustrialtools16instraightlineairsandermodel15772 Any of these actions sets up a disastrous scenario northernindustrialtools16instraightlineairsandermodel15772 that could lead to an accident involving serious injury or death.

The hazard of running man over-speed condition comes from centrifugal force. A result of rotary motion, centrifugal force is what causes a weight on the end of a string to pull the string taught when northernindustrialtools16instraightlineairsandermodel15772 the weight is swung in a circle. This same force causes the mass northernindustrialtools16instraightlineairsandermodel15772 of the grinding wheel to be northernindustrialtools16instraightlineairsandermodel15772 pulled outward from the center northernindustrialtools16instraightlineairsandermodel15772 of rotation as the wheel is spinning.

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