Detector to discriminate between tool break acoustic signatures and spiky noise
Patent 4707687 Issued on November 17, 1987. Estimated Expiration Date: 
May 5, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 5, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesAcoustic detection of tool break events in machine tool operations Acoustic monitoring of cutting conditions to detect tool break events Acoustic tool break detection system and method Patent #: 4642617 InventorsApplicationNo. 06/859533 filed on 05/05/1986US Classes:340/680, Machine tool340/683, Vibration73/104, SURFACE AND CUTTING EDGE TESTING73/660Rotating machinery or deviceExaminersPrimary: Rowland, James L.Assistant: Hofsass, Jeffery Attorney, Agent or FirmInternational ClassesG05B 19/4065 (20060101)G05B 19/406 (20060101) AbstractIn some machining conditions the background noise in an acoustic cutting tool break detection system is a low mean level with fairly dense high amplitude noise spikes. A common tool break vibration signature is the sudden appearance of a dense spiky noise. Digital signal pattern recognition logic uses an up/down counter to reject the noise on the basis of its lower spike density while alarming on such a tool break signature. Preprocessed vibration signal samples are tested against a detection threshold and an alarm generated if those whose amplitude is above the threshold amplitude exceeds those below by a preset count.Other References
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