Tool breakage detecting apparatus

Details Tool breakage detecting apparatus Tool breakage detecting apparatus

1978-08-22

1981-01-20

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

173 21, 235 92MP, 318572, G01B 1114, G05B 304, G08B 2100

Patent

active

042465770

ABSTRACT:
A tool breakage detecting apparatus is provided with a preset counter to be preset with a predetermined value. The content of the counter is subtracted one by one each time either one of a tool and a workpiece to be machined is moved a unit distance toward the other thereof from a cutting movement start position being spaced a predetermined distance from the other thereof. If the content of the counter is reduced an amount corresponding to a distance larger than the predetermined distance, tool breakage is detected.

REFERENCES:
patent: 3001421 (1961-09-01), Martens
patent: 3339434 (1967-09-01), Sparling
patent: 3628002 (1971-12-01), Meese et al.
patent: 3646419 (1972-02-01), Holy et al.
patent: 3679955 (1972-07-01), Rhoades
patent: 3754178 (1973-08-01), Dormehl et al.
patent: 3794814 (1974-02-01), Lay et al.
patent: 3840792 (1974-10-01), Yokoe

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