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.
Negative Reading
- Coupling half Y is to the left of coupling half X. Correct by sliding driver
evenly in the appropriate direction (Fig. 14).
Positive Reading
- Coupling half Y is to the right of coupling half X. Correct by sliding driver
evenly in the appropriate direction.
Figure 14: Top view
NOTICE:
Failure to slide motor evenly will affect horizontal angular correction.
4.
Repeat steps 1 through 3 until indicator P reads .05 mm (.002 in.) or less.
5.
Re-check both horizontal and vertical readings to ensure adjustment of one did not disturb the
other. Correct as necessary.
3.5.3 Complete alignment
A unit is in complete alignment when both indicators A (angular) and P (parallel) do not vary by more
than .05 mm (.002 in.) when measured at four points 90° apart.
Vertical Correction (Top-to-Bottom)
1.
Zero indicators A and P at top dead center (12 o’clock) of coupling half Y.
2.
Rotate indicator to bottom dead center (6 o’clock). Observe the needles and record the readings.
3.
Make corrections as outlined previously.
Horizontal Correction (Side-to-Side)
1.
Zero indicators A and P on the 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 the needle, measure and record the reading.
3.
Make corrections as outlined previously.
4.
Recheck both vertical and horizontal readings to ensure adjustment of one did not disturb the
other. Correct as necessary.
NOTICE:
With experience, the installer will understand the interaction between angular and parallel and
will make corrections appropriately.
3.5 Measurement
3500XD Installation, Operation and Maintenance Instructions
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