04.00|0889071 ROTA TP / ROTA TP-LH |en
Reduction in effective clamping force by the magnitude of the total centrifugal force, for grippin g 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
This calculated force must not be larger than the maximum
clamping force ΣS engraved on the lathe chuck.
See also "Lathe chuck data" table ( 3.1, Page 18)
From the above formula it is evident that the sum of the effective
clamping force F
sp
and the total centrifugal force F
c
is multiplied by
the safety factor for the clamping force S
sp
. According to VDI
3106, the following also applies here: S
sp
≥ 1.5.
The total centrifugal force F
c
is dependent on both the sum of the
masses of all jaws and on the center of gravity radius and the
speed of rotation.
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