Technical data
22
03.00 | ROTA 2B | Assembly and operating manual | en | 0889059
6.3.1 Calculation of the required clamping force in case of a given rpm
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 rotation, the jaw mass
generates an additional centrifugal force. The centrifugal force
reduces or increases the initial clamping force depending on
whether gripping is from the outside inwards or from the inside
outwards.
The sum of the initial clamping force
F
sp0
and the
total centrifugal
force F
c
is
the effective clamping force F
sp
.
(–)
for gripping from the outside inwards
(+)
for gripping from the inside outwards
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
required minimum clamping force F
spmin
. Consequently, the
workpiece is released spontaneously.
•
Do not exceed the calculated RPM.
•
Do not fall below the necessary minimum clamping force.
The workpiece
will be
uncontrollably
released in
this area
Speed of rotation
Clamping force
Centrifugal
force
Effective clamping force
Minimum required clamping force
Initial clamping force during shutdown
Reduction in effective clamping force by the magnitude of the total centrifugal force, for gripping from the outside
inwards.
