Carrier 17, Руководство по запуску и эксплуатации, Страница: 72 / 116

Measurement — Occasionally, coupling faces may not be per-
fectly true, or may have been damaged in handling. To com-
pensate for any such runout, determine the actual or ‘‘net’’
shaft misalignment as follows:
Check the opening at the top and at the bottom of the cou-
pling faces (or at each side when making plan adjustment).
Rotate both shafts exactly 180 degrees and recheck the open-
ings. Record the difference. (Example below is in inches.)
If the larger opening remains the same but changes from
side to side, the shafts are in perfect alignment. The change
in opening is due entirely to coupling runout, as above, or to
a burr or other damage to the coupling face.
If the larger opening remains the same, and remains
on the same side, the amount is entirely shaft (net)
misalignment.
If the larger opening remains on the same side but changes
amount, misalignment and runout are present. Add the two
amounts and then divide by two to get the actual or net
misalignment.
If the larger opening changes amount and also changes
from side to side, subtract the smaller amount from the larger
and divide by two to obtain the net misalignment.
Adjustment — Having obtained the net misalignment, the
amount by which the equipment must be moved can now be
calculated.
To determine:
S — amount of movement (in plan) or the thickness of
shim (in elevation) required.
Obtain:
D — coupling face diameter in inches (or indicator but-
ton circle)
L — distance between front and rear holddown bolts
(inches)
M — net misalignment in inches
And:
Divide L, the bolt distance, by D, the coupling diameter.
Multiply the result by M, the net misalignment.
L
S = × M
D
Fig. 39 — Measuring Angular Misalignment
in Elevation
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