Page 247 - Machinery Component Maintenance

Machinery Alignment 229

t Two-element optimum-move
corrections-move OB feet
south and IB feet north on
both elements by the amounts
as scaled from the plot

IB misalignment

Motor Motor Motor
OB midpoint IB
For horizontal corrections. a midpoint plot. asshown above. is often useful
for minimizing movements
If however we cannot move south (or down for vertical misalignmentl. our
optimum-move plot would look like one of the following
t or t
N UP
\Moveme;--r- point --- I -_ .
PlVOt
pivot
point
_r
.. 4-
A
v - i v o t points ;' Movement
r Movement
- f Movement
A
_- PlVOt h
1' Movement
Pivot point A
With three or more elements. the same principles apply For example the
followmg would give us minimum movements assuming two-directional
capability

The following would be our solution assuming t movement only:

Figure 5-46. Various possibilities in plotting minimum displacement alignment.