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HORIZONTAL
The following are examples of readings taken and plotted on the graph. First side to side and
represented by the line Y - Y. Hub A Total Indicator Reading (TIR) + 0.014in. Hub B total Indicator
Reading (TIR) - 0.008in.
As these are total readings they are first halved and so become A + 0.007in, and B - 0.004in.
Therefore as A is plus it is plotted above C - C and as B is minus it too is plotted above C - C.
These two points are connected by the line Y - Y. If this intersecting line when projected is below C
- C where it crossed the F1 and F2 lines then the required movement of the motor is towards the
FAR side. From the graph it can be seen that Y - Y intersects F1 0.002 in below and at F2 0.016in
below, so by moving the motor feet towards the FAR these amounts, front foot moved 0.002in and
the rear foot moved 0.015in we will achieve side to side alignment.
VERTICAL
The line X - X represents the reading taken from top to bottom which were, A minus 0.034in and B
plus 0.024in.
This means that A is minus so it is plotted below C - C 0.017in divisions, B is plus so it is also
plotted below C - C 0.012 divisions.
From the graph it can be seen that the intersecting line X - X passes through F1 0.002 in below C
- C which means that this is the thickness of shimming to be added to the front feet. However, at
F2 the line is 0.020" above C - C this means that the motor is high at the rear feet and this is the
thickness of shimming to be removed from these feet.
See also examples 2 and 3.
