SCHUNK ROTA THW 1000, Перевод оригинального руководства по эксплуатации, Страница: 24 / 45

Technical data
24 02.00|ROTA THW / THWB |en
The formula for the calculation of the total centrifugal force F
c
is:
For this, n is the given speed of rotation in RPM . The product m
B
∙ r
s
is referred to as the centrifugal force torque M
c
.
In case of toolholders with split chuck jaws, i.e., with base jaws and
top jaws, for which the base jaws change their radial position only
by the stroke amount, the centrifugal torque of the base jaws
M
cGB
and the centrifugal torque of the top jaws M
cAB
need to be
added:
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 for a given
speed
Required initial clamping force F
sp0
for a given speed 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 (application-
specific)
• 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:
3.3.2