In short, never over-speed a grinding wheel. rodac The speed air of the grinder must be compared to the speed marked on the wheel or package to make sure the sander machine''s speed is at or tools below the maximum operating speed of the wheel. Surpassing rodac and air and sander and tools this rodac and air rating risks not just wheel breakage but also the safety of sander shop personnel. tools About rodac the author: Roger Cloutier is a senior product safety engineer for the Norton Abrasives brand of Saint-Gobain Abrasives in Worcester, Massachusetts.

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 air that relatively small changes sander in speed can produce significant tools increases in force. In the example mentioned, rodac changing from 6,600 rpm to 7,700 rpm multiplies air the speed sander by 1.167. However, the corresponding tools and rodac centrifugal force would multiply by air a factor of sander and tools 1.167 x 1.167, or 1.36. To take rodac 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 air at 10,000 rpm. This represents an over-speed of about sander 1.5 times the wheel''s designed speed. But the corresponding centrifugal force-and the corresponding rotational tools and rodac stress on the air and sander wheel-would be about 2.3 times as much as tools the maximum allowed.

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