SCHUNK ROTA THW 1000, Перевод оригинального руководства по эксплуатации, Страница: 26 / 45

Technical data
26 02.00|ROTA THW / THWB |en
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.
Identifying the permissible RPM:
The calculated RPM n
zul
= 1495
rpm
is smaller than the maximum
permissible RPM of the chuck n
max
= 3200
rpm
(see "Chuck data"
table
(

3.1, Page 17) ).
This calculated RPM may be used.
Grades of Accuracy
Tolerances for run-out accuracy and axial run-out accuracy corre-
spond to the Technical Supply Terms for lathe chucks as per DIN
ISO 3089.
Permissible imbalance
The ROTA THW/THWB in ungreased state without chuck jaws cor-
responds to the balancing quality class 6.3 (according to DIN ISO
1940-1). Residual imbalance risks may arise due to insufficient ro-
tation compensation being achieved (see DIN EN 1550 6.2 e). This
applies particularly to high speeds, asymmetrical workpieces or
the use of various chuck jaws, as well as uneven application of
lubricants. In order to prevent damage resulting from these
residual risks, the entire rotor is to be dynamically balanced in
accordance with DIN ISO 1940-1.
3.4
3.5