2.
Check setting of indicators by rotating coupling half X to ensure indicators stay in contact with cou-
pling half Y but do not bottom out. Adjust indicators accordingly.
3.5 Measurement
1.
To ensure accuracy of indicator readings, always rotate both coupling halves together so indicators
contact the same point on coupling half Y. This will eliminate any measurement problems due to
runout on coupling half Y.
2.
Take indicator measurements with driver feet hold-down bolts tightened. Loosen hold down bolts
prior to making alignment corrections.
NOTICE:
Take care not to damage indicators when moving driver during alignment corrections.
3.5.1 Angular alignment
A unit is in angular alignment when indicator A (Angular indicator) does not vary by more than .05 mm
(.002 in.) as measured at four points 90° apart.
Vertical Correction (Top-to-Bottom)
1.
Zero indicator A at top dead center (12 o'clock) of coupling half Y.
2.
Rotate indicators to bottom dead center (6 o'clock). Observe needle and record reading.
3.
Negative Reading - The coupling halves are further apart at the bottom than at the top. Correct
by either raising the driver feet at the shaft end (add shims) or lowering the driver feet at the other
end (remove shims), shown below.
Figure 12: Negative reading correction
Positive Reading - The coupling halves are closer at the bottom than at the top. Correct by either
lowering the driver feet at the shaft end (remove shims) or raising the driver feet at the other end
(add shims).
4.
Repeat steps 1-3 until indicator A reads .05 mm (.002 in) or less.
Horizontal Correction (Side-to-Side)
1.
Zero indicator A on left side of coupling half Y, 90° from top dead center (9 o'clock).
2.
Rotate indicators through top dead center to the right side, 180° from the start (3 o'clock). Ob-
serve needle and record reading.
3.5 Measurement
16
3501 Installation, Operation, and Maintenance Instructions
