Automatic gain control for machine tool monitor

Details Automatic gain control for machine tool monitor Automatic gain control for machine tool monitor

1986-12-19

1988-08-16

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340683, 73104, 73660, 364474, G08B 2100

Patent

active

047647604

ABSTRACT:
An acoustic tool break detector monitors vibration caused by a cutting process and has an analog amplifier to condition the signal, then searches for a rapid sustained change in signal level indicative of a cutting tool break. An automatic gain control circuit dynamically controls the gain of the analog amplifier and adjusts the output cutting noise signal to a desired average level during an active cut while allowing use of such a break algorithm. The time rate at which the AGC changes gain is constant and independent of gain; it is set such that a gain change of 2:1, for instance, takes longer than the confirmation period for a tool break. The analog amplifier has a variable attenuator whose gain is set by the outputs of an up/down counter; these outputs are fed back to a variable clock whose rate is dependent on gain at any instant. The clock outputs drive the counter until the analog cutting noise signal is within a preselected window.

REFERENCES:
patent: 4514797 (1985-04-01), Begin
patent: 4563897 (1986-01-01), Moore
patent: 4724524 (1988-02-01), Thomas et al.
S. R. Hayashi et al., "Automatic Tool Touch and Breakage Detection in Turning", Intl. Congress of Metalworking and Automation, Hanover, Sep. 18-19, 1985, pp. 96-101.

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