HBM HBK S2M, Mounting Instructions, Page: 20 / 124

S2M
MECHANICAL INSTALLATION
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3. Shaft surface quality and hardness
The recommended surface roughness is ≤ 10 μm.
The shaft must have a minimum hardness of 50 HRC.
7.3.4 Installation with load button and thrust piece
For measuring compressive forces, the S2M can be equipped with a load button and ap­
propriate thrust piece (available as accessories). To do this, the force transducer must be
screwed directly onto a construction element or suitable substructure. The force trans­
ducer measures static and dynamic compressive forces, and can be used at full oscilla­
tion width (peak-to-peak).
The substructure must be capable of absorbing the force to be measured. Remember
that the rigidity of the overall system depends on the stiffness of the force application
part and the substructure. Please also note that the substructure must ensure that the
force always has to be applied to the transducer vertically, i.e. there must be no inclina­
tion, even under full load.
Force is applied to the top of the force transducer via the spherical load button
(1-U1R-200kg).
Install the load button with a minimum tightening torque of 15 Nm. We recommend using
our thrust pieces (1-EDO3/1kN) to guarantee ideal force application. These thrust pieces,
which are placed on the convex load button, have a suitable surface quality.
If you want to do without a thrust piece, please note that the surface of the structural
component that applies the force to the convex load application part must be ground and
have a minimum hardness of 40 HRC.