Optimum OPTI turn TU 3008G Operating Manual page 64

Base tensioning force
Required minimum tensioning force
The required effective clamping force for machining F
machining force F with the safety factor S
spz
calculation of the clamping force.
According to VDI 3106, the following also applies here:
F = F · S [ N ]
sp spz z
From this we can derive the calculation of the initial clamping force during shutdown:
F = S · (F ± F
sp0 sp sp c
ATTENTION!
This calculated force must not be larger than the maximum clamping force ∑
engraved on the chuck.
From the above formula it is evident that the sum of the effective clamping force F
total centrifugal force F
According to VDI 3106, the following also applies here:
The total centrifugal force F
center of gravity radius and the RPM.
ATTENTION!
For safety reasons, in accordance with DIN EN 1550, the centrifugal force may be a
maximum of 67% of the initial clamping force.
The formula for the calculation of the total centrifugal force F
F = ∑ (m r )
· ·
c b s
n is the given speed in r.p.m.. The product m
force torque M .
c
M = m · r [ kgm ]
c B s
GB 3442761
64
Speed
. This factor takes into account uncertainties in the
z
- for gripping from the outside in
) [ N ]
+ for gripping from the inside out
is multiplied by the safety factor for the clamping force S
c
is dependent both on the sum of the masses of all jaws and on the
c
π 2 π
( n ) (
·
= ∑ M
·
30 c 30
· r
B
Translation of original instruction
is calculated from the product of the
sp
S ≥ 1.5
sp
is:
c
2
n )
·
[N]
is described as the centrifugal
s
Workpiece is
released uncontrollably
( 24 KN )
S
and the
sp
.
sp
Version 1.1.6 - 2021-09-17