Installation, operation and maintenance instructions
High voltage flameproof motors for explosive atmosphere
Control list 5 – Mechanical installation
Issued by: MOLM
Sheet No.
3AAM101028 E
Rev. B
Page 6 di 13
01.2023
W
e r
eserve
a
ll
rig
ht
s i
n t
hi
s
do
cument an
d in t
he
inf
orm
at
io
n
con
tai
n
e
d
the
rein.
R
epr
o
duct
ion
,
use of
di
sc
losu
re
t
o t
h
ird
par
tie
s
w
itho
ut
ex
pr
es
s aut
h
or
ity
is
st
ric
tly
for
bidd
en.
Customer
Machine type
Machine serial n°
Radial misalignment
a
1
, b
1
, c
1
and d
1
are readings from the dial indicator "R" at the points a = top, b = bottom, c = right, d = left (4 turns, each of 90° angle).
The readings are entered in the formula to obtain the values of radial misalignment (table 1).
Table 1
Measuring
points
1st
measurement
2nd
measurement
Example – measures in
Vertical
hundredth of mm
Top
a
1
a
2
25
28
Bottom
b
1
b
2
31
28
Difference
a
1
-b
1
a
2
-b
2
-6
0
Vertical
misalignment
a
b
2
1
1
a
b
2
2
2
-3
0
+ Left-hand coupling higher than the right-hand one
Left-hand coupling
- Left-hand coupling lower than the right-hand one
raised by 0,03 mm.
Horizontal
Right
c
1
c
2
38
28
Left
d
1
d
2
18
28
Difference
c
1
-d
1
c
2
-d
2
20
0
Horizontal
misalignment
c
d
1
1
2
c
d
2
2
2
10
0
+ Left-hand coupling displaced to right of the right-hand one
Left-hand coupling
- Left-hand coupling displaced to left of the right-hand one
moved to left by 0,1 mm.
Check for
measuring error
a
b
c
d
1
a
b
c
d
1
1
1
1
2
2
2
2
25 + 31
1
28 + 28
28 + 28
38 18
Schematic for table 1
Axial gap and misalignment
The axial gap is determined by taking readings from the two dial indicators AI and AII, whereby the first reading from the top indicator AI
is designated by e
1
and that from the bottom indicator AII by h
1
. The values for vertical and horizontal gaps can be determined as
shown in table 2 ; axial displacement (in the example 0.2 mm) during the measurement does not affect the results. Use a feeler gauge
in case the gap is too small to use a dial gauge.
Table 2
Measuring points
Dial AI
Dial AII
Example – measures in
Vertical gap
hundredth of mm
Top
e1
g1
50
42
Bottom
f1
h1
62
50
Gap
2
)
(
)
(
1
1
1
1
h
g
e
f
2
)
50
42
(
)
50
62
(
+ The gap is greater at the top
The gap is greater by
- The gap is greater at the bottom
0,1 mm at the top.
Horizontal gap
Left
i1
l1
40
36
Right
k1
m1
48
40
Gap
2
)
(
)
(
1
1
1
1
m
l
i
k
2
)
40
36
(
)
40
48
(
+ The gap is greater at the left
The gap is greater by
Schematic for table 2
- The gap is greater at the right
0,06 mm at the left.
For record files
To
From
Date
Page
Issued by
Reg. n°
Continues on page
top
Left-hand
coupling
bottom
Direction
of view
Right-hand
coupling
right
left
Left-hand
coupling
bottom
Direction
of view
Right-hand
coupling
top
Right
Left
Left-hand
coupling
bottom
Direction
of view
Right-hand
coupling
