SCHUNK ROTA NC plus 2 Series - Calculation of the Permissible Speed in Case of a Given Initial Clamping Force

Technical data
02.00|ROTA NC plus 2 / ROTA NCF plus 2 |en
25
Centrifugal torque for one jaw:
The chuck has 3 jaws, the total centrifugal torque is:
The total centrifugal force can now be calculated:
Initial clamping force during shutdown that was sought:
Calculation of the permissible speed in case of a given initial
clamping force
Calculation of the permissible speed n
perm
in case of a given initial
clamping force F
sp0
The following formula can be used to calculate the permissible
RPM for a given initial clamping force during shutdown:
NOTICE
The calculated permissible RPM may not exceed the maximum
RPM inscribed on the chuck for safety reasons!
Example of calculation: Permissible RPM for a given effective
clamping force
The following data is known from previous calculations:
• Initial clamping force during shutdown F
sp0
= 17723 N
• Machining force for machining job F
spz
3000 N (application-
specific)
• Total centrifugal torque of all jaws ∑M
c
= 2.668 kgm
• Safety factor S
z
= 1.5 (according to VDI 3106)
• Safety factor S
sp
= 1.5 (according to VDI 3106)
NOTE:
Masses of the jaw mounting screws and T-nuts are not taken into
account.
6.3.3