Apparatus and method for sensing excessive wear or failure of ma

Details Apparatus and method for sensing excessive wear or failure of ma Apparatus and method for sensing excessive wear or failure of ma

1984-01-16

1986-06-03

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

340679, 73104, G08B 2100

Patent

active

045932778

ABSTRACT:
A channel is formed in the body of a machine tool holder, this channel extending to the area where the tool is working on the workpiece. A pneumatic flow away from the tool is established by means of a vacuum source connected to the channel. A pressure transducer is connected to the channel so that it is capable of sensing the pneumatic pressure therein. The transducer produces an electrical output in accordance with the sensed pressure, this electrical output being suitably processed to provide a control signal capable of shutting down the operation of the machine tool and simultaneously providing a warning signal. With the incipient failure of the tool, as evidenced by either excessive heating of the tool or the production of filamentary chips from the tool (this occurring when the outer hardened coating of the tool wears off), an abrupt change in the pneumatic pressure in the channel occurs resulting in the generation of a control signal which both shuts down the machine tool operation and provides a warning signal to the operator. A complete failure, such as breakage of the tool, will also cause a pressure change producing such a control signal.

REFERENCES:
patent: 4325163 (1982-04-01), Mattson et al.
patent: 4332161 (1982-06-01), Kakino
patent: 4471444 (1984-09-01), Yee et al.

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