Acoustic detection of milling tool touch to a workpiece

Details Acoustic detection of milling tool touch to a workpiece Acoustic detection of milling tool touch to a workpiece

1986-08-25

1988-11-01

Lall, Parshotam S.

Boots, shoes, and leggings

364508, 73609, 73660, 340680, 340683, G08B 2100, G06F 1536, G01M 700

Patent

active

047824522

ABSTRACT:
The initial contact of a rotating milling tool to a workpiece is detected in the presence of spurious noise spikes by digitally processing samples of a preprocessed vibration signal concurrently through basic tool touch detection logic and milling tool touch detection enhancement logic, and generating a touch indication if either logic set is satisfied. The basic logic detects a continuously increasing signal level higher than a threshold set above background noise. The milling logic detects an above-threshold signal sample and sets up an acceptance window about the expected time of contact of the next cutter. Tool touch is declared when an above-threshold signal occurs during the window; the milling logic is reset by a noise spike in the interval before the window starts. The basic logic detects tool touch in a dense spiky noise situation.

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