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 the weight is swung in a circle. This same force causes the mass of the grinding wheel to be pulled outward from northernindustrialtoolscompactairbeltsandermodel11285 the center of rotation as the wheel is spinning.

Danger comes from the fact that centrifugal force does not increase in direct proportion to an increase in speed, but instead it increases as the square of that speed increase. When rotational speed doubles, centrifugal force quadruples. This effect means that relatively small changes in speed can produce significant increases in force. In the example mentioned, changing from 6,600 rpm to 7,700 rpm multiplies the speed by 1.167. However, the corresponding centrifugal force would multiply by a factor of 1.167 x 1.167, or 1.36. To take a more extreme example, consider the same wheel with a maximum safe operating speed of 6,600 rpm run on a 5-inch right angle grinder at 10,000 rpm. This represents an over-speed of about 1.5 times the wheel''s designed speed. But the corresponding centrifugal force-and the corresponding rotational stress on the wheel-would be about 2.3 times as much as the maximum allowed.

One potential source of serious injury in grinding comes from an oversight that is easy to make: operating northernindustrialtoolscompactairbeltsandermodel11285 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, danger may also northernindustrialtoolscompactairbeltsandermodel11285 result from a wheel run just slightly faster than its rated speed. This less severe over-speed condition can cause the 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 northernindustrialtoolscompactairbeltsandermodel11285 of 7,700 northernindustrialtoolscompactairbeltsandermodel11285 rpm can cause northernindustrialtoolscompactairbeltsandermodel11285 the wheel to crack. This cracking can lead to breakage later. northernindustrialtoolscompactairbeltsandermodel11285 Any of these actions sets up a disastrous scenario that could lead to an accident involving serious injury or death.

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