HBK HBM Z4A Montageanleitung Seite 18

Pre-stressing the knuckle eyes is not possible. Knuckle eyes do not have high endurance
when the full oscillation bandwidth is used. The design of the Z4A allows knuckle eyes to
be used without loss of accuracy.
We recommend mounting the knuckle eyes offset by 90 degrees, to keep bending
moments from any direction away from the sensor.
Mount the knuckle eyes as follows:
S
Screw the knuckle eye in as far as the retainer
S
Screw the knuckle eye back about two turns
The dimensions of the knuckle eyes, as well as those of the Z4A with knuckle eyes, can
be found in the technical data.
Notice
Knuckle eyes are only suitable for static and quasi-static measurements. For applications
measuring alternating loads, we recommend pliable (cardanic) tension/compression bars
mounted under pre-stress (see section 7.3.)
Notes on mounting with knuckle eyes
1. Shaft diameter
When using a sensor with knuckle eyes mounted on one or both sides, make sure that the
shaft is the right size.
You will find the diameters of the knuckle eyes, suitable shafts and their recommended
tolerances in the tables below
Knuckle eye with internal thread
Knuckle eyes
1-Z4/20kN/ZGOW
1-Z4/2T/ZGOW
1-Z4/100kN/ZGOW
1-Z4/10T/ZGOW
1-Z4/500kN/ZGOW
Tab. 7.1 Recommended fitting sizes/tolerances for shaft and hole – knuckle eye with
internal thread
16
Nominal Hole fitting
diameter
16
20
30
50
60
Recommended shaft
size
H7
+0.002
-0.014
+0.003
-0.018
MECHANICAL INSTALLATION
fitting size
g6
f7
Z4A