Worn tool detector utilizing normalized vibration signals
Patent 4514797 Issued on April 30, 1985. Estimated Expiration Date: 
September 3, 2002. 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.
September 3, 2002. 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 References Re30298 3694637 Automatic machine tool including a monitoring system Broken, chipped and worn tool detector Method and system for determining the wear of a drill bit in real time Machine monitoring system and apparatus Rotating tool wear monitoring apparatus Patent #: 4471444 InventorAssigneeApplicationNo. 06/414735 filed on 09/03/1982US Classes:700/175, Condition of tool or workpiece (e.g., tolerance, tool wear)340/680, Machine tool340/683, Vibration702/34, Wear or deterioration evaluation73/104, SURFACE AND CUTTING EDGE TESTING73/660Rotating machinery or deviceExaminersPrimary: Smith, JerryAssistant: MacDonald, Allen R. Attorney, Agent or FirmInternational ClassesB23Q 17/09 (20060101)G05B 19/4065 (20060101) G05B 19/406 (20060101) AbstractA worn tool detector system for analyzing input signals from a sensor were the signal is in the form of an analog waveform exhibiting periodic impulses exceeding the average amplitude thereof as the tool wears. A microprocessor controlled variable gain amplification network is utilized to normalize the average waveform amplitude to a fixed level. During machine operation, impulses are detected by comparing the sensor waveform to a programmable selected ratio of the normalized level. When a given number of successive impulses are received the microprocessor generates a warning signal which may be used to retract the tool. An adaptive mode is disclosed wherein the sensor waveform throughout the course of the machining operation is repetitively normalized to adjust for different sensor waveform amplitudes.Other References
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