Geometrical instruments – Area integrators – Electrical
Patent
1985-07-16
1986-11-18
Little, Willis
Geometrical instruments
Area integrators
Electrical
33172D, 33DIG13, G01B 731
Patent
active
046227512
ABSTRACT:
A precision electromechanical measuring device utilizes a strain gauge or pressure transducer to sense changes of position in a workpiece contacting finger. The finger is pivotable about a relatively stiff pivot to different positions, enabling the instrument's use as a center finder for circular bores and pins or for verifying the flatness and perpendicularity of a disc or plate to the axis of rotation of a spindle. A housing of the device supports a rotatable shank extending from one end for engagement in a chuck, mandrel or collet associated with a spindle of a machine, and also supports pivotal apparatus including the finger extending out the other end of the housing. Brushes conduct a variable signal from the strain gauge in the housing to the exterior, where the signal is fed to an ammeter. In use as a center finder, the device is fixed in a chuck or mandrel, with a workpiece approximately alligned with the center of rotation of the mandrel, the finger is engaged against the interior of a bore or the exterior of a pin of the workpiece, and the machine spindle is power-rotated to sweep the finger around the bore or pin. Variations in the reading of the ammeter indicate eccentricity and direction and degree of eccentricity.
REFERENCES:
patent: 2849799 (1958-09-01), Muller
patent: 3102343 (1963-09-01), Plank
patent: 3167866 (1965-02-01), Steineman
patent: 3303572 (1967-02-01), Vreeland, Jr.
patent: 3914869 (1975-10-01), Merz et al.
patent: 4084323 (1978-04-01), McMurtry
Freiburger Thomas M.
Little Willis
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