6-10
ROTALIGN 01.2000
The ROTALIGN measurement principle
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ENTER
MAIN AUX
.....BATT ..... ........ ........
CHARGE
SLEEP
Shaft alignment in theory and in practice
To measure the misalignment, the shafts are rotated. The laser beam
shines onto the receiver detector, and during rotation any misalign-
ment in the shaft causes the laser beam to change its position in the
receiver.
The exact location of the beam is recorded by registering its
coordinates along with the corresponding rotation angle of the
shafts. This takes place at a number of points during shaft rotation
through 360° or less. Several different measurement procedures
(described on page 4-34) are available to handle special situations
such as uncoupled shafts and limited rotation.
The computer then uses the minute displacements measured by the
detector to calculate the current alignment condition. It displays the
resulting machine alignment diagram complete with coupling align-
ment values and position values for the machine feet. The former
allow the operator to compare the situation at hand with prescribed
tolerances.
Checking alignment with vibration analysis
One very impressive method of demonstrating the importance of
good alignment for smooth operation of rotating equipment is
comparative vibration measurement (for example, using
PRÜFTECHNIK VIBROSPECT
®
FFT or VIBROTIP
®
) before and after
alignment. A comprehensive vibration analysis can also point out
other specific machine problems.
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