Interferometric correction system for a numerically controlled machine

Patent · Sun Jan 01 00:00:00 EST 1978

OSTI ID:863232

Burleson, Robert R ^[1]

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1. Clinton, TN

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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: W-7405-ENG-26
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4128794
• OSTI ID: 863232
• Country of Publication: United States
• Language: English

Related Subjects

interferometric
correction
numerically
controlled
machine
provided
improve
positioning
accuracy
tool
example
high-precision
laser
interferometer
feedback
monitor
moved
command
pulses
position
compares
commanded
indicated
pulse
train
applied
monitored
lags
preselected
error
additional
added
advance
closer
reducing
lag
leading
comparison
deleted
exceeds
magnitude
correct
relative
numerically controlled
tool relative
pulse train
machine tool
controlled machine
laser interferometer
interferometric correction
positioning accuracy
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