HYDROK – Safety
2.10.6 Sample calculation
Applied to a specific example
Longitudinal turning of an offset shaft of 16MnCr5
[pre-machined clamping diameter] without tailstock
support in horizontal position.
Workpiece data
Clamping diameter d
sp
= 60 mm
Workpiece length
L
w
=150mm [151,5mm unmachined]
Machining diameter – turning operation
d
z
= 57,0 mm
Workpiece mass m
w
= 3,3 kg
→ F
G
= m
w
* 9,81 m/s
2
→ F
G
= 33 N
Process data
Speed n=800 1/min
Feed f=0,25 mm
Clamping depth a
p
=1,5 mm
Use of cooling lubricant
Clamping length L
sp
=20mm
Chuck
SPANNTOP pull-back size 65
Clamping head used:
D=60 mm, smooth, extension length=3 mm
Detailed consideration
The first condition, namely that the workpiece length
may equal up to six times the clamping diameter, is
satisfied.
The second condition, namely that the workpiece
mass must not exceed 40 kg, at chuck size 65 is sat-
isfied.
The third condition, that the workpiece must be
clamped at least 0.08*dsp=0.08*60 mm=4.8 mm, is
more than satisfied with clamping length 20 mm –
3 mm extension length = 17 mm.
To verify the fourth condition, first it is necessary, in
accordance with principle 1, to determine the required
radial clamping force.
34
Order h49 7144.907-333
