Geometrical instruments – Area integrators – Electrical
Patent
1982-03-15
1984-03-13
Little, Willis
Geometrical instruments
Area integrators
Electrical
33180R, 33DIG1, G01B 731
Patent
active
044359055
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, 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.
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patent: 2943394 (1960-07-01), Schabot
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Hallett et al., "Technology for Industrial Manufacturing," 1972, pp. 73 to 76 and pp. 409-411.
"Notes on Applied Science No. 15, Application of Spring Strips to Instrument Design", National Physical Lab (England).
"Handbook of Industrial Metrology," American Society of Tool and Manufacturing Engineers, pp. 234-236.
"American National Standard Measurement of Out-of-Roundness, ANSI B89.3.1-1972", The American Society of Mechanical Engineers.
Carnahan L. E.
Esposito Michael F.
Little Willis
Roth Gary C.
The United States of America as represented by the United States
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