Installation, operation and maintenance instructions
High voltage flameproof motors for explosive atmosphere
AMD Rg 355-400-450-500
Aligning with driven equipment – Horizontal and vertical machines
Issued by: MOLM
Sheet No.
3AAM101032 E
Rev. B
Page. 3 of 3
01.2023
W
e
res
erv
e
a
ll
right
s
in
this
d
oc
u
ment
an
d
in
the
inf
or
mati
o
n
con
tai
n
e
d
th
er
e
in.
R
epr
od
uct
ion
,
use
o
f
disc
losur
e
to
t
h
ir
d
par
tie
s
w
itho
ut
ex
pr
es
s aut
h
or
ity
is
st
ric
tly
for
bidd
en.
Axial gap and misalignment
The axial gap is determined by taking readings from the two dial indicators A I and A II, whereby the first reading from the top
indicator A I is designated by e
1
and that from the bottom indicator A II by h
1
. The values for vertical and lateral misalignment
can be determined as shown in Table 2; axial displacement (in example 0,2 mm) during the measurement does not affect the
results (Fig. 2).
Table 2
Measuring location
Dial AI
Dial AII
Example - measures
Vertical Gap
in hundredth of mm
Top
e1
g1
50
42
Bottom
f1
h1
62
50
Gap
(
) (
)
f
e
g
h
1
1
1
1
2
10
2
)
50
42
(
)
50
62
(
+
The gap is greater at the top
The gap is greater by
-
The gap is greater at the right
0,1 mm at the top.
Lateral Gap
Left
i1
l1
40
36
Right
k1
m1
48
40
Gap
(
) (
)
k
i
l
m
1 1
1
1
2
6
2
)
40
36
(
)
40
48
(
+
The gap is greater at the left
The gap is greater by
Fig. 2
-
The gap is greater at the right
0,06 mm at the left.
Schematic for Table 2
Radial misalignment of the two coupling halves must be read in the 4 position each of 90° at same distance.
In the example it is assumed that an axial movement of the shaft of 0,2 mm took place during the measurement.
Maximum permissible value of vertical and lateral gap:
Rigid coupling …………………................................................
b =
0,02 mm
Gear coupling ………………………………………………………
b =
0,05 mm
Flexible coupling (e.g. rubber-bushed coupling)...........……….
b =
0,10 mm
Axial gap and misalignment
The axial gap is determined by taking readings from the two dial indicators A I and A II, whereby the first reading from the top
indicator A I is designated by e
1
and that from the bottom indicator A II by h
1
. The values for vertical and lateral misalignment
can be determined as shown in Table 2; a minimal axial displacement (in example 0,2 mm) during the measurement does not
affect the results (Fig. 2).
Axial displacement.
There must be sufficient axial clearance between the two coupling halves to accept a thermal expansion of 1 to 2 mm from the
machine shaft.
a = 3
1 mm, or in conformity with coupling manufacturer data.
top
right
left
left-hand
coupling
bottom
Direction of
view
right-hand
coupling
b
a
