Soft footFigure 7-28:
Correcting this type of problem with a full shim can make the condition worse (see
Figure 7-29, figure on the left). Correction should be determined with a set of thickness
gauges (feeler gauges). The result is usually a wedge shim (see Figure 7-29, figure on the
right).
Correcting soft footFigure 7-29:
The Laser Align Application allows you to locate the problematic feet and bypass those feet
that are good. While the hold-down bolts are individually loosened and re-tightened, the
laser and sensor measure the shaft-to-shaft position. This actually measures how much
each connection affects shaft alignment. In a perfect condition, loosening bolts should not
move the shafts at all.
The foot pre-check methods to evaluate measured movement at the shafts include:
• Soft Foot
• Frame Distortion Index (FDI)
Although they evaluate data differently, both methods give you a sense of soft foot
severity at each location. Soft Foot results are shown by the number of Xs displayed and
FDI results are shown as a numerical value.
Advanced Laser Alignment
MHM-97432 Rev 7 215
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