TOPlus mini / TOPlus premium pull-back
Use and limits of use
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5.2.4 Third limit [clamping length]
The clamping length must not be less than the minimum
length required for clamping
𝐿
𝑠𝑝
≥ 𝐿
𝑠𝑝 𝑚𝑖𝑛
.
The front-end length of the clamping head
𝐿
𝑣
is not consid-
ered at all here.
With offset clamping bores [head bore], it may be necessary
to take account of a relief groove in the clamping head when
establishing the clamping length.
WS Workpiece
The clamping length is calculated as follows:
𝐿
𝑠𝑝
= 𝐿
𝑠𝑝 𝑣
− 𝐿
𝑣
𝐿
𝑠𝑝
≥ 0.08 ∗ 𝑑
𝑠𝑝
applies in all cases
In addition,
the following applies:
𝐿
𝑠𝑝
≥ 2.8𝑚𝑚
[when using clamping heads with a
smooth clamping bore]
𝐿
𝑠𝑝
≥ 13𝑚𝑚
[when using clamping heads with longitu-
dinal and transverse grooves]
When using clamping heads with a
closed first tunnel, different details apply
which may be even higher. Consult the
manufacturer for these details.
𝐿
𝑠𝑝
≥ 7𝑚𝑚
[when using clamping heads with Z ser-
rations]
𝐿
𝑠𝑝
≥ 5𝑚𝑚
[when using clamping heads with
F serrations]
If HAINBUCH uses a different and shorter clamping length
in this clamping situation drawing, this will have been
checked against the specific parameters for this type of ap-
plication and found to be sufficient.
5.2.5 Fourth limit [forces]
The following sample calculation shows how to quantify the
forces that are exerted on the workpiece from an external
source.
The aim here is to establish whether
1. the clamping force required to absorb external forces
and torques can be applied by the clamping device.
2. the clamping device is free of visible or invisible damage
caused by those external forces.
The forces and torques exerted on the clamping head and,
ultimately, on the chuck are, for the most part,
a) the machining forces and torques to be absorbed
b) the density of the workpiece itself,
