HYDROK – Safety
L
SP
= 17mm, corresponds to the full clamping
length minus the extension length of the
clamping head
p
=(
d
z
2
)=
57
2
=
28,5
, because of longitudinal turning operation
F
fz
=(
m
∗
rs
+
q
)∗(
π
∗
n
30
)
2
From table 6:
m = 2,05 kg
rs = 0,027 m
F
fz
=(
2,05
kg
∗
0,027
m
)∗(
π
∗
800 1
min
30
)
2
=
390N
F
raderf
=
1,6
∗
1,3
∗(
1,6
∗(
F
sz
+
F
sk
)+
F
fz
)
F
raderf
=
1,6
∗
1,3
∗(
1,6
∗(
14.703
+
14.727
)+
390
)=
98.745N
F
raderf
=
99kN
Because the size 65 chuck can apply a maximum ra-
dial clamping force F
rad
max. = 105 kN, principle 1
would thus be satisfied.
In this example principle 2 is not relevant, because
you are working without tailstock anyway.
Principle 3 would also be satisfied because the calcu-
lated cutting force of F
c
= 1226 N is far below the limit
of 4500 N.
In this example, principles 4 and 5 are again irrele-
vant because both principles must only be considered
for radial drilling work.
Result of the sample
calculation
All four limits are verified.
At full axial loading of the chuck with Fax=45 kN a
nominal 105 kN is applied radially on the workpiece.
This satisfies the condition F
rad
≥ F
raderf
.
Thus the machining can be executed.
It must be ensured that the chuck is in good condition
relative to degree of contamination and lubrication.
A check of the radial clamping force with a suitable
clamping force gauge must be executed in advance
of the machining as a precautionary measure. The
values determined in this process must be within the
range shown in section 3 »Clamping force diagram «
shown for RPM.
36
Order h49 7144.907-333
