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9.2 Determining the permitted speed of rotation
9.2.1 Centrifugal force F
Formulae (1), (2) and (3) produce the following result
for clamping from the outside in:
F
spo
F
=
– F
sp
S
sp
In this case the centrifugal force F
the mass of all jaws m
and the speed of rotation n.
The following formula can be derived:
.
.
F
= (m
r
)
(
c
B
s
The expression m
B
moment M
c
.
M
= m
r
[mkg]
c
B
s
9.3 Permitted speed of rotation
The following formula applies for determining the
permitted speed of rotation for a specific machi-
ning job:
F
30
spo
p
n
=
perm
(Nothe the number of jaws for S M
B
C
R
L
A
A
, and centrifugal moment M
c
[N]
c
is dependent on
c
, the centre of gravity radius r
B
.
p
n
2
) [N]
30
⋅
r
is called the centrifugal
s
.
– (F
S
)
spz
z
–1
[min
] (9)
M
c
)
c.
Chuck size
r
s
Max. weight in kg
R
max. in mm
a
L
max. in mm
a
Centrifugal moment M
The following formula applies to chucks with sliding
c
and false jaws in which the false jaws AB can be mo-
ved in order to alter the clamping area and the sliding
jaws GB approximately maintain their radial position:
M
= M
c
cGB
(4)
M
cGB can be obtained from the table below.
M
s
cAB can be calculated using the following formula:
M
= m
cAB
(5)
(6)
Important:
Do not exceed the maximum speed of rotation
n
of the chuck (marked on the body of the
max
chuck). This applies even if the calculated
permitted speed of rotation n
the maximum speed n
220
280
350
A
75
95
103
B
36,5
45
50
C
53
54.5
80
0,88
1,4
2,58
63
78
106
29
30
45
0,070
0,161
0,400
GB [mkg]
C
+ M
[mkg]
cAB
⋅
r
[mkg]
AB
sAB
is greater than
perm
.
max
400
500
630
800
130
130
130
130
50
50
50
50
80
80
80
80
3,1
3,1
3,1
3,1
135
185
250
335
45
45
45
45
0,718
1,17
2,94
4,95
(7)
(8)
13
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