Detection by automatic gain control features of gradual cutting

Details Detection by automatic gain control features of gradual cutting Detection by automatic gain control features of gradual cutting

1987-05-07

1989-02-21

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340683, 73104, 73660, G08B 2100

Patent

active

048069140

ABSTRACT:
A tool break detection system has an automatic gain control to adjust the analog signal channel gain and hold the cutting vibration signal at a desired average level. The AGC time constant is long enough that the detection of abrupt tool breaks and sudden large signal level transistions by the digital signature recognition logic is unaffected. However, the gradual decrease in signal level produced by a crumbly-type break would be removed by AGC action. In a system with a hardware AGC, crossing a high gain threshold resets gain to a low value and the resulting abrupt and persisting change in signal level is detected by the abrupt tool break logic. Another embodiment uses the gain command output by a software AGC and generates a break detected signal directly, without resetting the gain command, as gain rises above a high gain alarm level which is recalculated at the start of each cut.

REFERENCES:
patent: 4514797 (1985-08-01), Begin
patent: 4563897 (1986-01-01), Moore
patent: 4636779 (1987-01-01), Thomas et al.
patent: 4636780 (1987-01-01), Thomas et al.
patent: 4642617 (1987-02-01), Thomas et al.
patent: 4764760 (1988-08-01), Bedard et al.

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