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Title: Interferometric correction system for a numerically controlled machine

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.

Inventors:
 [1]
  1. Clinton, TN
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
863232
Patent Number(s):
4128794
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G05 - CONTROLLING G05B - CONTROL OR REGULATING SYSTEMS IN GENERAL
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
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; /318/250/702/

Citation Formats

Burleson, Robert R. Interferometric correction system for a numerically controlled machine. United States: N. p., 1978. Web.
Burleson, Robert R. Interferometric correction system for a numerically controlled machine. United States.
Burleson, Robert R. Sun . "Interferometric correction system for a numerically controlled machine". United States. https://www.osti.gov/servlets/purl/863232.
@article{osti_863232,
title = {Interferometric correction system for a numerically controlled machine},
author = {Burleson, Robert R},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1978},
month = {1}
}

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