SCHUNK ROTA THWvario, Сборка и руководство по эксплуатации, Страница: 22 / 77

Technical data
22 01.00|ROTA THW vario |en-US
DANGER
Risk to life and limb of the operating personnel and significant
property damage when a certain RPM limit is exceeded!
When clamping from the outside in, as the RPM increases, the
effective clamping force decreases by the amount by which the
centrifugal force increases (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.
Reduction in effective clamping force by the magnitude of the total centrifugal force, for gripping from the outside inwards.
The required effective clamping force for machining F
sp
is
calculated from the product of the
machining force F
spZ
and the
safety factor S
z
. This factor takes into account uncertainties in the
calculation of the machining force. According to VDI 3106: S
z
≥ 1.5.
From this we can derive the calculation of the initial clamping
force during shutdown:
(+) for gripping from the outside inwards
(–) for gripping from the inside outwards