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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
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
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
Vertical Gap
Top
Bottom
Gap
+
The gap is greater at the top
-
The gap is greater at the right
Lateral Gap
Left
Right
Gap
+
The gap is greater at the left
-
The gap is greater at the right
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
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.
and that from the bottom indicator A II by h
1
Dial AI
Dial AII
e 1
g 1
f 1
h 1
(
f
e
)
(
g
h
)
1
1
1
1
2
i 1
l 1
k 1
m 1
k
i
l
m
(
) (
)
1
1
1
1
2
and that from the bottom indicator A II by h
1
. The values for vertical and lateral misalignment
1
Example - measures
in hundredth of mm
50
42
62
50
(
62
50
)
(
42
50
)
10
2
The gap is greater by
0,1 mm at the top.
40
36
48
40
(
48
40
)
(
36
40
)
6
2
The gap is greater by
Fig. 2
0,06 mm at the left.
Schematic for Table 2
b
. The values for vertical and lateral misalignment
1
a
Sheet No.
3AAM101032 E
Rev. B
01.2023
Page. 3 of 3
top
right
Direction of
view
right-hand
left-hand
coupling
coupling
bottom
left
Issued by: MOLM
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