Page 143 - Rotating Machinery Pratical Solutions to Unbalance and Misalignment

Advanced Machine Alignment

Figure 8-14. Rim & Face Calculator Method for Vertical Alignment

Figure 8-15. Rim & Face Vertical Alignment Solution

exact procedures as outlined in the first run. This will assure that
the correct adjustments have been made. If the second run calls for
additional adjustments, the correct amount of shims should once
again be installed or removed. Certain machines, especially those
with weak or semi-flexible frames, may require three or even four
runs to obtain the exact alignment.
Remember, the amount of torque applied to the hold-down
bolts, the sequence in which they are tightened, small burrs on the
shims, dirt or grit can all influence the final outcome. By paying
attention to the small details and being clean, an exact alignment
can often be made on the first try. Once the fixtures are set up and
the machine is down, and the alignment tools are on site, it takes