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42 Portal axes with ball screw drive
3 Technical Data PAS4•S
MNA1MLSDM00EN, V2.01, 07.2009
3.5 Service life
The service life of the product is a function of the mean forces and tor-
ques that act in the system. If multiple forces and torques act simultane-
ously, use the following formula to calculate the loading factor k.
Figure 3.10 Forces and torques
The service life of the axis (in km) can be approximated using the load-
ing factor and the service life - load characteristic curve.
The application-specific load values appear in the numerator.
The numerator contains the maximum permissible forces and torques.
These forces and torques decrease at increasing velocities, see char-
acteristic curves in chapter 3.
3.6 Positioning accuracy and repeatability
Positioning accuracy and repeatability depend on temperature, load and
velocity changes as well as the accuracy of the ball screw drive and the
accuracy of the switching points of the sensors.
At steady temperature, speed and load, the repeatability amounts to ±
0.02 mm.
Fy
Fymax
+
Fz
Fzmax
+
Mx
Mymax
+
My
Mymax
+
Mz
Mzmax
= k
Fz
Mz
Fy
My
Fx
Mx