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At AirSanders.com we specialize in air sanders, as well as any other tools you can thinks of. Our large inventory of air sanders makes sure we have the air sander in stock that you are looking for. Enter hereIn short, never over-speed a grinding wheel. The speed of the grinder must be compared to the speed marked on the wheel or package to make sure the machine''s air and flow speed is at or below the maximum operating speed of the wheel. Surpassing this rating risks not just wheel breakage but also the safety of shop personnel. About the author: Roger Cloutier is a senior product safety engineer for the Norton highway Abrasives brand of Saint-Gobain Abrasives in Worcester, Massachusetts. One sander potential source of serious injury in grinding comes from an oversight that is easy to make: operating 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 result from a wheel run air 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 flow speed of 6,600 rpm on a 7-inch angle grinder with a speed of highway 7,700 rpm can cause the wheel to crack. This cracking can lead to breakage later. Any of these actions sets up a disastrous scenario that could lead to an accident involving serious injury or death. Danger sander 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 air small changes in speed can produce significant increases in force. In the example flow mentioned, changing from 6,600 rpm to 7,700 rpm multiplies the speed by 1.167. However, the corresponding centrifugal force would multiply highway by a factor of 1.167 x 1.167, or sander 1.36. To take a more extreme example, consider the same wheel with a maximum safe operating speed of 6,600 rpm air run on a 5-inch right angle flow grinder highway at 10,000 rpm. This represents an over-speed sander and air of about 1.5 times the wheel''s designed speed. But the corresponding centrifugal force-and the corresponding flow rotational stress on the wheel-would highway be about sander 2.3 times as much as the maximum allowed. ©2003 www.airsanders.com. All rights reserved. |