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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 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 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. 10. More emphasis has been placed on full operating front wheel brakes. Eventually, automatic limiting valves (ALV) will be disallowed. A report filed by the USA National Transportation Safety Board identified them as contributing to truck accidents. Many truck manufacturers are now offering a bobtail proportioning valve for front brakes. It senses when the trailer is disconnected by sensing pressure in the tractor air line, and proportions air to the drive wheels whenever the tractor is operating without a trailer.Maintenance for proper balanceThe secret to successful brake balance through proper maintenance is in keeping the air brake system up to OEM (original equipment manufacturer) standards. Here is a baker''s dozen of suggestions that not only keep brakes in balance, but they also will contribute to maximum drum and lining life. Truckers that sub-contract brake maintenance should ensure the brake shop that they choose complies with the following: ©2003 www.autoheaters.net All rights reserved. |
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