Acoustic detection of contact between cutting tool and workpiece

Details Acoustic detection of contact between cutting tool and workpiece Acoustic detection of contact between cutting tool and workpiece

1984-08-29

1986-12-23

Smith, Jerry

Boots, shoes, and leggings

364183, 364184, 364508, 371 62, 371 64, 307231, 307234, 377 16, 318563, 73609, 73613, 73660, G06F 1546, G01N 2404, G01M 700

Patent

active

046316833

ABSTRACT:
A system and method for monitoring vibrations of a machine tool metal-cutting tool insert and interpreting them to promptly detect the initial touch to the workpiece and signal the tool to stop advancing before marring the surface. The signal generated by a sensor such as an accelerometer is preprocessed to eliminate lower frequency machine noise and detect the energy in a higher frequency band, then sampled and analyzed by digital circuitry. In order to avoid false alarms on high amplitude spiky noise pulses generated by traverse operation of the machine tool, the tool touch alarm is delayed longer than the maximum duration of the noise pulses. Two techniques are given to ignore the noise spikes while still detecting the tool touch signal.

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