Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Patent
1977-10-11
1978-12-05
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
318640, 250568, G05B 1928
Patent
active
041287940
ABSTRACT:
An interferometric correction system for a numerically controlled machine is provided to improve the positioning accuracy of a machine tool, for example, for a high-precision numerically controlled machine. A laser interferometer feedback system is used to monitor the positioning of the machine tool which is being moved by command pulses to a positioning system to position the tool. The correction system compares the commanded position as indicated by a command pulse train applied to the positioning system with the actual position of the tool as monitored by the laser interferometer. If the tool position lags the commanded position by a preselected error, additional pulses are added to the pulse train applied to the positioning system to advance the tool closer to the commanded position, thereby reducing the lag error. If the actual tool position is leading in comparison to the commanded position, pulses are deleted from the pulse train where the advance error exceeds the preselected error magnitude to correct the position error of the tool relative to the commanded position.
REFERENCES:
patent: 3708657 (1973-01-01), Kelling
patent: 3786332 (1974-01-01), Hepner et al.
patent: 3889164 (1975-06-01), Nishizawa et al.
Breeden David E.
Carlson Dean E.
Dobeck B.
Hamel Stephen D.
The United States of America as represented by the United States
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