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10.1.2 Other errors
Errors of alignment fall into categories of angularity and eccentricity, or a combination of both.
NOTE: ABOUT SHAFT ALIGNMENT!
Errors of angularity should be checked for, and corrected, before errors of eccentricity.
Alignment in accordance with the following procedure will ensure vibration levels meeting
those set out in ISO 10816 Part 1.
Errors of Angularity:
Figur 17. Angularity
1. Take measurements with a block gauge and feelers at the four points 1, 2, 3 and 4 as shown in the figure below.
1
2
3
4
NOTE: ABOUT WORKING TEMPERATURE!
Check the alignment after running the unit until it has attained its normal working
temperature. Any discrepancies can then be rectified.
Figur 18. Four points
– The difference between the reading 1 and 3 will give the
error of alignment in the vertical plane, (over the length
of shaft equal to the diameter of the coupling flanges, and
from this the difference in the relative heights of the feet
of the motor or other connected machine can be found by
proportion.)
– The difference between the reading 2 and 4 gives the
amount of sideways adjustment necessary to correct any
errors of alignment in the horizontal plane.