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Apparatus for detecting damages of cutting tools

  • US 4,087,801 A
  • Filed: 12/16/1975
  • Issued: 05/02/1978
  • Est. Priority Date: 12/20/1974
  • Status: Expired due to Term
First Claim
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1. Apparatus for detecting damage of a cutting tool comprising a detector for producing a detection output signal in accordance with vibration created by at least one of a cutting tool or a workpiece worked thereby during a cutting operation, a signal processing circuit including a root mean square circuit for producing a root mean square signal representing the root mean square value of said detection output signal from said detector, a normal data memory circuit for producing an output data signal at the time of normal cutting, said normal data memory circuit comprising a timer which produces an output signal a predetermined interval after the appearance of said root mean square signal and an initial value setter which produces said output data signal having a value corresponding to the level of said root mean square signal existing at the time when said timer output signal is produced, and comparator means for comparing said output data signal from said normal darta memory circuit with said root mean square signal.

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