Geometrical instruments – Gauge – Collocating
Patent
1989-01-03
1990-05-29
Haroian, Harry N.
Geometrical instruments
Gauge
Collocating
33412, G01B 525
Patent
active
049284010
ABSTRACT:
A shaft alignment system is disclosed to facilitate obtaining alignment measurement data on coupled rotating shaft machinery. The system includes one or more alignment scales which are mounted for relative sliding movement across the shaft coupling. The alignment scales include cooperating true and Vernier scale components for highly precise measurements with readings to an accuracy of 0.001" or 0.01 mm. This allows both axial displacement and parallel and angular misalignment to be checked and corrected. The system can be used on many different couplings, such as disc-type and diaphragm-type, flexible couplings. The alignment scales are mounted on U-shaped bases with the distal end of the true scale being held captive in the lateral direction within the Vernier scale base so as to stabilize against wind induced fluttering and vibration. Cold alignment checks may be taken first and then the machinery is brought up to speed, allowed to stabilize thermally, and a stroboscopic light source synchronized to the shaft speed to illuminate the scales. The scales are read at the desired relative positions according to standard alignment techniques.
REFERENCES:
patent: 4033042 (1977-07-01), Bently
patent: 4102052 (1978-07-01), Bloch
patent: 4428126 (1984-01-01), Banks
patent: 4516328 (1985-05-01), Massey
patent: 4586264 (1980-05-01), Zatezalo
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