Alignment bracket assembly integrity check and sag determination

Details Alignment bracket assembly integrity check and sag determination Alignment bracket assembly integrity check and sag determination

1992-06-03

1993-02-16

Haroian, Harry N.

Geometrical instruments

Gauge

Collocating

33412, G01B 525

Patent

active

051859378

ABSTRACT:
Methods for verifying the mechanical integrity of an alignment bracket, particularly a multi-configurable alignment bracket, used for aligning co-rotatable in-line machine shafts, and for determining the amount of alignment bracket "sag" to be accounted for when subsequently employing readings taken with the alignment bracket. The invention employs a previously-established relationship between sag and deflection of the alignment bracket under the influence of a known force to determine sag and to verify mechanical integrity of the alignment bracket in situ, avoiding the need for the usual prealignment sag determination on a separate straight pipe or mandrel. In the practice of the method, the alignment bracket is set up in a position for use, on the actual shafts being aligned. The extension bar of the alignment bracket is positioned above the centerlines of the shafts, and a known force is applied by hanging a known weight at a predetermined point on the alignment bracket. This force results in a deflection of the extension bar, which is measured. From the measured deflection, a sag value is determined based on a previously-determined relationship. To verify integrity of the alignment bracket, measured deflection is preliminarily compared to a range of acceptable deflection values for the particular alignment bracket dimensional configuration.

REFERENCES:
patent: 3525158 (1970-08-01), Torlay
patent: 4367594 (1983-01-01), Murray, Jr.
patent: 4586264 (1986-05-01), Zatezalo
Shaft Alignment Handbook, J. Piotrowski, Copyright 1986, pp. 101-103.
Alignment Manual for Horizontal, Flexibly Coupled Rotating Machines, 3rd Edition, M. Murray, Jr., Copyright 1983, p. 31.
Total Alignment, V. R. Dodd, Copyright 1974, pp. I-5, II-6, II-7.
"Coupling Alignment: The Reverse Indicator Method Simplified", Boalm, P/PM Technology, Jul./Aug. 1990, pp. 16-23.
"Aligning Shafts--Part 1, Measuring Misalignment", Durkin, Plant Engineering, Jan. 11, 1979, pp. 86-90.
"Aligning Shafts--Part 2, Correcting Misalignment", Durkin, Plant Engineering, Feb. 8, 1979, pp. 102-105.

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