In short, ingersoll never over-speed a grinding wheel. The speed rand of the grinder must be quiet compared to the speed marked on the wheel or package to make sure the machine''s speed is at or below 6in the dual maximum operating speed of the action wheel. Surpassing this rating risks not just wheel air breakage but also sander the safety of shop personnel. About the author: Roger Cloutier is a senior product safety model engineer for the Norton Abrasives brand of Saint-Gobain 311 and ingersoll Abrasives in Worcester, rand and quiet and 6in Massachusetts.

The dual and action and air and sander and model hazard of running man over-speed condition comes from centrifugal force. 311 A result of rotary motion, centrifugal force ingersoll is what causes a weight on the end of a string to pull the string taught rand when the weight quiet is swung in a circle. This 6in same force causes the mass of the grinding wheel to be pulled outward from the center of rotation as the wheel is spinning.

Danger comes from the dual and action and air fact that centrifugal sander and model and 311 and ingersoll force does not rand increase in quiet direct proportion to an 6in increase dual and action in air speed, but instead sander and model and 311 it increases as the ingersoll square of that rand speed increase. When rotational speed doubles, quiet centrifugal force quadruples. 6in This effect means that relatively dual small changes in speed can produce significant action and air and sander and model increases 311 in force. ingersoll In the rand example mentioned, changing from 6,600 rpm to 7,700 rpm multiplies quiet the speed by 1.167. However, 6in and dual and action the corresponding centrifugal air force sander and model would multiply by a factor of 1.167 x 1.167, or 1.36. To take 311 a more extreme ingersoll example, consider rand the same wheel quiet with 6in a maximum dual safe action operating speed air of 6,600 rpm run on a 5-inch right angle grinder at 10,000 rpm. This represents an over-speed sander and model and 311 and ingersoll of about 1.5 times rand the quiet wheel''s designed 6in and dual speed. But the corresponding centrifugal force-and the corresponding rotational action and air stress on the wheel-would sander and model be about 2.3 times as 311 much as the maximum allowed.

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