Method for determining the misalignment in the horizontal plane

Details Method for determining the misalignment in the horizontal plane Method for determining the misalignment in the horizontal plane

1990-09-17

1992-06-23

Evans, F. L.

Optics: measuring and testing

Angle measuring or angular axial alignment

356153, 359872, G01B 1127

Patent

active

051237369

ABSTRACT:
A method for determining from optical measurement a measure of the misalignment, i.e. the deviation in the horizontal plane between the actual and the desired position of a rotatable elongated part (9) of a machine (1). Use is made of an imaginary vertical reference plane (.SIGMA.) lying at a distance from the machine (1). The reference plane (.SIGMA.) is determined by two base points (3, 4) which set up an imaginary base line (.GAMMA.) at an angle (.uparw.) relative to the longitudinal axis (L) of the machine (1), and by an optically reflecting device (5) disposed such that any cross-section thereof with a horizontal plane is a straight line at right angles to the imaginary reference plane (.SIGMA.). With an optical or electro-optical measuring instrument (7) equipped for angle measurement, and a further optically reflecting device (10) being placed on said machine part (9), the angle (.phi.) between the line of sight (Z) of the measuring instrument (7) and an arbitrary imaginary line (.OMEGA.) forming an angle (.sigma.) with the imaginary reference plane (.SIGMA.) is measured. With this measured angle (.phi.) the misalignment of the machine part (9) can be determined. The invention also provides an optical reflecting device (10) for placing on a machine part (9) to be measured.

REFERENCES:
patent: 3726600 (1973-04-01), Carmack et al.
patent: 3923402 (1975-12-01), Turcotte
patent: 4298281 (1981-11-01), Schave

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