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 rodacairsandertools speed doubles, rodacairsandertools 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 rodacairsandertools rpm. rodacairsandertools 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.

The hazard of running man over-speed condition comes from centrifugal rodacairsandertools 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 rodacairsandertools weight is swung in a circle. This same force causes the mass of the grinding wheel to be pulled rodacairsandertools outward from the center of rotation as the wheel is spinning.

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