quick-acting jaw change system Owner's manual

7.3 Permitted speed of rotation
The following formula applies for determining the
permitted speed of rotation for a specific machining
job:
n
perm
=
(Nothe the number of jaws for Σ M
c.
)
F
spo
-- ( F
spz
.
S
z
) [min
-- 1
](9)


M
c
30
π
.
n
7.2.1 Centrifugal force F
c
, and centrifugal moment M
c
Formulae (1), (2) and (3) produce the following result for
clamping from the outside in:
F
sp
=--F
c
[N] (4)
In this case the centrifugal force F
c
is dependent on
the mass of all jaws m
B
, the centre of gravity radius r
s
and
the speed of rotation n.
The following formula can be derived:
F
c
=(m
B
.
r
s
)
.
()[N] (5)
The expression m
B
⋅ r
s
is called the centrifugal
moment M
c
M
c
=m
B
.
r
s
[mkg] (6)
The following formula applies to chucks with sliding and
falsejawsinwhichthefalsejawsABcanbemovedin
order to alter the clamping area and the sliding jaws GB
approximately maintain their radial position:
M
c
=M
cGB
+M
cAB
[mkg] (7)
M
cGB
can be obtained from the table below.
M
cAB
canbecalculatedusingthefollowingformula:
M
cAB
=m
AB
⋅ r
sAB
[mkg] (8)
The clamping forces can be obtained by referring to the
clamping force/speed of rotation diagram (see page 28)
when using standard series production
jaws allocated to specific chuck by the chuck
manufacturer.
F
spo
S
sp
π
30
Do not exceed the maximum speed of rotation n
max
of the chuck (marked on the body of the chuck).
This applies even if the calculated permitted
speed of rotation n
perm
is greater than the maximum
speed n
max
.
7.2 Determining the permitted speed of rotation
2
at max.
speed
Chuck
8. Clamping force/speed of rotation diagram see page 33
9. Clamping force/actuating force diagram see page 34
B
A
C
o
/
L
A
R
A
r
s
Chuck-size 140 160 175 200 250 315 400 500 630
A 85 85 85 105 125 145 180 180 260
B202020223034505068
C4141414555568080110
Max. weight in kg 0,43 0,43 0,43 0,73 1,5 2,27 4,5 4,5 13
R
a
max. in mm 45 55 62 70 93 112 140 190 220
L
a
max. in mm 26 26 26 29 35 36 48 48 62
Centrifugal moment M
cGB
[mkg] 0,0182 0,048 0,0575 0,087 0,194 0,406 0,89 1,36 3,15
Important: