Danger comes from the fact that centrifugal force does not increase in direct proportion to an increase in speed, but instead random it increases as orbital and air the square of that speed increase. sander When rotational speed doubles, centrifugal force quadruples. This effect random means that relatively small changes orbital in speed can produce air and sander significant increases in force. In the random example mentioned, changing from 6,600 rpm to 7,700 rpm multiplies the speed by orbital 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, air consider the same wheel with a maximum safe operating speed of 6,600 rpm run on a 5-inch right sander 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.

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

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