SCHUNK ROTA NCR 1000, Assembly And Operating Manual, Page: 24 / 43

Technical data
24 02.00|ROTA NCR |en
The centrifugal torque of the base jaws M
cGB
can be found in the
table "Chuck data"
(

3.1, Page 17) . The centrifugal torque of the
top jaws M
cAB
is calculated as per:
Calculation example: Required initial clamping force Fsp0 for a
given rpm n
The following data is known for the machining job:
• Gripping from the outside in (application-specific)
• Machining force F
spz
= 3000 N (application-specific)
• max. speed of rotation n
max
= 3200
rpm
("Chuck data" table)
• RPM n = 1200 rpm (application-specific)
• Mass of one (!) top jaw m
AB
= 5.33 kg (applicationspecific)
• Center of gravity radius of top jaw r
sAB
= 0.107 m (application-
specific)
• 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.
First the required effective clamping force F
sp
is calculated using
the machining force stated:
Initial clamping force during shutdown:
Calculation of total centrifugal force:
For two-part chuck jaws, the following applies:
Centrifugal torque of base jaw and top jaw specified in "Chuck
data" table:
For the centrifugal torque of the top jaw, the following applies:
Centrifugal torque for one jaw:
3.3.2