HYDROK
Use and limits of use
Order h49 7144.907-333
49
5.2.6 Sample calculation
Applied to a specific example
Longitudinal turning of an offset shaft made of 16MnCr5
[blank clamping diameter] unsupported in a horizontal posi-
tion.
Workpiece data
Clamping diameter
𝑑
𝑠𝑝
= 60𝑚𝑚
Workpiece length
𝐿
𝑤
= 150𝑚𝑚
[
151.5𝑚𝑚
blank]
Machining diameter of turning operation
𝑑
𝑧
= 57.0𝑚𝑚
Workpiece mass
𝑚
𝑤
= 3.3𝑘𝑔
→
𝐹
𝐺
= 𝑚
𝑤
∗ 9.81
𝑚
𝑠
2
→
𝐹
𝐺
= 33𝑁
Process data
Speed
𝑛 = 800𝑚𝑖𝑛
−1
Feed
𝑓 = 0.25𝑚𝑚
Chip-cutting depth
𝑎
𝑝
= 1.5𝑚𝑚
Use of cooling lubricant
Total clamping length
𝐿
𝑠𝑝 𝑣
= 20𝑚𝑚
Clamping head chuck
Pull-back TOPlus size 65
Clamping head used
Smooth
Clamping diameter of clamping head
𝐷 = 60𝑚𝑚
Front-end length
𝐿
𝑣
= 3𝑚𝑚
Detailed observation
This satisfies the first condition, which is that the unclamping
length must not exceed six times the clamping diameter.
This also satisfies the second condition, which is that the
workpiece mass must not exceed
𝑚
𝑤
40𝑘𝑔
of size 65 of
clamping head chuck.
This more than satisfies the third condition, which is that the
workpiece must at least be clamped with
0.08 ∗ 𝑑
𝑠𝑝
= 0.08 ∗
60𝑚𝑚 = 4.8𝑚𝑚
, with a clamping length of
𝐿
𝑠𝑝
= 𝐿
𝑠𝑝 𝑣
− 𝐿
𝑣
=
20𝑚𝑚 − 3𝑚𝑚 = 17𝑚𝑚
.
To check the fourth condition, the required level of clamping
force needs to be established first, in accordance with Prin-
ciple 1.
