Machinery Vibration: Alignment

The most significant task in the total alignment process is actually moving the machines. This generally takes the most time and is independent of the measurement or calculation methods. The graphical calculations are the easy part of the alignment process. It takes only a few minutes to arrive at the proper moves from dial-indicator readings, and this part can be done in the shade. Taking the measurements accurately is next in level of difficulty. After the readings and calculations are complete, that heavy machine must be wrestled into position. Any person, and even some gorillas, can move a machine with brute force. A master mechanic will orchestrate precise, small movements of any size machine with finesse so that it slides into position almost naturally. These practical aspects of alignment will be addressed in this chapter, i.e., how to make moves smooth and positive, and how to solve "bolt-bound" problems.
Every machine is movable. Some are easier to move than others. The start of every alignment job usually considers one machine fixed and the other movable. If one must begin with that restriction, the following guidelines are offered:
Move electric motors rather than the driven equipment.
For heavy drivers, like diesel engines or steam turbines, try moving the driven equipment first.
Move equipment with no heavy piping attached.
For equipment that operates at temperature extremes, consider first moving the machine that operates closer to ambient temperature.
The only absolute rule to retain is that everything is adjustable. The degree of...