6-4
ROTALIGN 01.2000
Shaft alignment in theory and in practice
Comparison of alignment methods
2
mils
1
mm
1
100
mm
1000
1
0,05 mils
O
N
O
F
F
C
L
R
D
I
M
M
E
N
U
M
0
3
8
4
1
2
7
9
5
6
ENTE
R
E
NTE
R
A
C
C
U
B
A
T
T
L
O
A
D
S
L
E
E
P
Measurement
Messen
Correction
Korrigieren
5 mils
mm
1
10
Straightedge
The straightedge is the most well-known
and widespread shaft alignment tool. If
both the coupling surface and the mea-
suring eye are in good condition, align-
ment accuracy may approach 1/10 mm
(5 mils). This may be sufficient for some
machines and couplings.
Thanks to its simplicity, the straightedge
is ideal for quickly performing a rough,
preliminary alignment.
Dial indicators
Dial indicators offer much more accu-
rate alignment readings: when used cor-
rectly, they can achieve shaft alignment
accuracy of 1/100 mm (1/2 mil). To do
so, however, bracket sag must always be
measured first, and the mounting ar-
rangement must be very rigid. The mea-
surement values must be recorded cor-
rectly (without mixing up +/- signs or
transposing values, of course) and then
the alignment corrections must be cor-
rectly calculated from the indicator
readings.
Laser optics
This approach has the highest accuracy
available. ROTALIGN has an actual reso-
lution of 1/1000 mm—better than any
other available system (except for our
other products!). Laser optics also give
the user several other distinct advantag-
es. Custom-made brackets are no longer
required for each individual machine/
coupling arrangement. Instead, since no
mechanical linkage across the coupling
is involved, just a few universal brackets
can be used to mount quickly on nearly
every machine. Measurements must no
longer be read and written down, and
correction values for the machine feet
appear automatically in the display.
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