Rotary chuck - K11-200 ISO 702-2
Version 1.0.5 - 2020-12-09
87
Originalbetriebsanleitung
3442762
│
3442763
│
3442764
GB
K11-
200_I
SO
-702
-2_3
4427
62_3
44276
3_43
3276
4_GB
.f
m
7.5
Calculating the required clamping force for a given speed
The initial clamping force F
sp0
is the total force impacting radially on the workpiece via the jaws
due to actuation of the lathe chuck during shutdown. Under the influence of rpm, the jaw mass
generates an additional centrifugal force. The centrifugal force reduces or increases the initial
clamping force depending on whether gripping takes place from the outside in or from the
inside out. The sum of the initial clamping force F
sp0
and the centrifugal force F
c
, is the effec-
tive clamping F
sp
.
DANGER!
Risk to life and limb of the operating personnel and significant property damage when
the RPM limit is exceeded! With gripping from the outside inwards, and with increasing
RPM, the effective clamping force is reduced by the magnitude of the increasing
centrifugal force (the forces are opposed). When the RPM limit is exceeded, the
clamping force drops below the minimum clamping force F
spmin
Consequently, the
workpiece is released in an unchecked manner.
Do not exceed the calculated RPM.
Do not fall below the necessary minimum clamping force.
F
sp
= F
sp0
± F
c
[N]
- for gripping from the outside in
+ for gripping from the inside out
Legend
F
c
Total centrifugal force [ N ]
M
cAB
Centrifugal force of top jaws in [ kgm ]
F
sp
Effective clamping force [ N ]
M
cGB
Centrifugal force of base jaws in [ kgm
F
spmin
Required static clamping force [ N ]
n
Rotational speed [ rpm ]
F
sp0
Initial clamping force [ N ]
r
s
Center of gravity radius [ mm ]
F
spz
Cutting force [ N ]
r
sAB
Center of gravity radius of top jaw
m
AB
Mass of one top jaw [ kg ]
s
sp
Clamping force safety factor
m
B
Mass of chuck jaw set [ kg ]
s
z
Safety factor for cutting
M
c
Centrifugal force torque [ kgm ]
Σ
s
Max. Clamping force of the chuck [ KN
1 Newton (N) = 1 kg m/s²
