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Now hear this

Acoustic emission (AE) sensors detect ultrasonic sound waves emitted when the grinding wheel contacts a part or the dressing wheel and send that information to a process control unit. Monitoring the sound waves and comparing them with reference values allows operators to control the grinding and dressing processes. Variations in acoustic emissions indicate changes in cutting forces, which can then be modified. Some AE sensors are stationary while others rotate with the wheels. Electronic filters reduce or eliminate acoustic emissions from other nearby devices, such as bearings.

—As excerpted from "Now Hear This," CUTTING TOOL ENGINEERING, April 2008 



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