Geometrical instruments – Gauge – Straightness – flatness – or alignment
Patent
1985-11-13
1987-04-28
Haroian, Harry N.
Geometrical instruments
Gauge
Straightness, flatness, or alignment
33655, G01B 338
Patent
active
046602941
ABSTRACT:
A method and apparatus are disclosed for measuring and displaying parallelism, or the lack thereof, of first and second flat surfaces using a video monitor and three displacement transducers. The first surface is in a fixed position while the second surface may be fixed or may be adjustable so as to attain parallelism between the surfaces. A first point is selected on the first surface and a second point is selected on the other surface such that the line between the two points is perpendicular to the first surface. The three displacement transducers are zero calibrated between the two points. Subsequently, the transducers are mounted between the two surfaces in a triangular pattern and their output signals are summed and supplied to the video monitor which has a fixed display indicating theoretical parallelism. The output of the transducers is combined so as to display the actual angular relationship between the two surfaces. Movement of the second surface allows alignment of the two displays, which indicates parallelism of the two surfaces. The disclosure illustrates the use of the apparatus for aligning turbine wheels. Additionally, a further transducer may be used to check the flatness of the second surface relative to the first surface after parallelism has been attained.
REFERENCES:
patent: 1272976 (1918-07-01), McLucas
patent: 3128561 (1964-04-01), Payne
patent: 3670421 (1972-06-01), Kiewicz
patent: 3711955 (1973-01-01), Holt
patent: 4406069 (1983-09-01), Clement
Cahill Robert A.
General Electric Company
Haroian Harry N.
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