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Title: Telescoping magnetic ball bar test gage

Abstract

A telescoping magnetic ball bar test gage for determining the accuracy of machine tools, including robots, and those measuring machines having non-disengageable servo drives which cannot be clutched out. Two gage balls (10, 12) are held and separated from one another by a telescoping fixture which allows them relative radial motional freedom but not relative lateral motional freedom. The telescoping fixture comprises a parallel reed flexure unit (14) and a rigid member (16, 18, 20, 22, 24). One gage ball (10) is secured by a magnetic socket knuckle assembly (34) which fixes its center with respect to the machine being tested. The other gage ball (12) is secured by another magnetic socket knuckle assembly (38) which is engaged or held by the machine in such manner that the center of that ball (12) is directed to execute a prescribed trajectory, all points of which are equidistant from the center of the fixed gage ball (10). As the moving ball (12) executes its trajectory, changes in the radial distance between the centers of the two balls (10, 12) caused by inaccuracies in the machine are determined or measured by a linear variable differential transformer (LVDT) assembly (50, 52, 54, 56, 58,more » 60) actuated by the parallel reed flexure unit (14). Measurements can be quickly and easily taken for multiple trajectories about several different fixed ball (10) locations, thereby determining the accuracy of the machine.« less

Inventors:
 [1]
  1. (Pleasanton, CA)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
864908
Patent Number(s):
4435905
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
telescoping; magnetic; ball; bar; gage; determining; accuracy; machine; tools; including; robots; measuring; machines; non-disengageable; servo; drives; clutched; balls; 10; 12; held; separated; fixture; allows; relative; radial; motional; freedom; lateral; comprises; parallel; reed; flexure; unit; 14; rigid; 16; 18; 20; 22; 24; secured; socket; knuckle; assembly; 34; fixes; center; respect; tested; 38; engaged; manner; directed; execute; prescribed; trajectory; equidistant; fixed; moving; executes; changes; distance; centers; caused; inaccuracies; determined; measured; linear; variable; differential; transformer; lvdt; 50; 52; 54; 56; 58; 60; actuated; measurements; quickly; easily; multiple; trajectories; locations; ball bar; relative radial; radial distance; machine tools; measuring machine; machine tool; differential transformer; variable differential; linear variable; measuring machines; lateral motion; telescoping magnetic; servo drive; magnetic ball; /33/901/

Citation Formats

Bryan, James B. Telescoping magnetic ball bar test gage. United States: N. p., 1984. Web.
Bryan, James B. Telescoping magnetic ball bar test gage. United States.
Bryan, James B. Sun . "Telescoping magnetic ball bar test gage". United States. https://www.osti.gov/servlets/purl/864908.
@article{osti_864908,
title = {Telescoping magnetic ball bar test gage},
author = {Bryan, James B.},
abstractNote = {A telescoping magnetic ball bar test gage for determining the accuracy of machine tools, including robots, and those measuring machines having non-disengageable servo drives which cannot be clutched out. Two gage balls (10, 12) are held and separated from one another by a telescoping fixture which allows them relative radial motional freedom but not relative lateral motional freedom. The telescoping fixture comprises a parallel reed flexure unit (14) and a rigid member (16, 18, 20, 22, 24). One gage ball (10) is secured by a magnetic socket knuckle assembly (34) which fixes its center with respect to the machine being tested. The other gage ball (12) is secured by another magnetic socket knuckle assembly (38) which is engaged or held by the machine in such manner that the center of that ball (12) is directed to execute a prescribed trajectory, all points of which are equidistant from the center of the fixed gage ball (10). As the moving ball (12) executes its trajectory, changes in the radial distance between the centers of the two balls (10, 12) caused by inaccuracies in the machine are determined or measured by a linear variable differential transformer (LVDT) assembly (50, 52, 54, 56, 58, 60) actuated by the parallel reed flexure unit (14). Measurements can be quickly and easily taken for multiple trajectories about several different fixed ball (10) locations, thereby determining the accuracy of the machine.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {1}
}

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