Tool failure detector

Details Tool failure detector Tool failure detector

1985-07-23

1987-02-10

Myracle, Jerry W.

Communications: electrical

Condition responsive indicating system

Specific condition

73660, 34037026, G08B 2100

Patent

active

046426183

ABSTRACT:
A failure detector detects breakage in a machine tool cutting element, such as a drill bit, by use of a accelerometer supported against a workpiece being operated on by the cutting element. Vibrations are induced in the workpiece by the cutting operation, the vibrations having spectral components in the audio frequency range which are characteristic of proper operation of the cutting element, the spectral components changing upon a breakage of the cutting element. A voltage produced by a positioning mechanism of the cutting element identifies the location of the cutting element relative to the workpiece. A bandpass filter separates the spectral components associated with proper operation from spectral components associated with faulty operation. Logic circuitry signals the joint occurrence of the spectral components of proper operation with the position of the cutting element at the site of the workpiece so as to permit the signaling of a cutting tool failure during operation on the workpiece.

REFERENCES:
patent: 3728919 (1973-04-01), Scott
patent: 3793627 (1974-02-01), Darrel et al.
patent: 3932836 (1976-01-01), Harrell et al.
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patent: 4207567 (1980-06-01), Juengel et al.
patent: 4340326 (1982-07-01), Buonauro et al.
patent: 4420685 (1983-12-01), Ohtani et al.
patent: 4558311 (1985-12-01), Forsgren et al.
Wray, T. E., "Broken (Missing) Drill Detector"; IBM Technical Disclosure Bulletin; vol. 25, No. 1; Jun. 1982.

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