Machine Guidance; Cylinder - Siemens SINAMICS S120 System Manual

System overview
2.1 Structure of a hydraulic drive
2.1.1

Machine guidance

Guidance systems
Guidance for straight-line movement of machine slides and tables is accomplished with
minimum friction and maximum precision using hydrodynamic and hydrostatic slideways or
roller slideways.
Friction
A certain degree of friction can be very useful for damping oscillations.
However, excessive friction, especially pronounced transitions from static to sliding friction,
has a negative effect on the control result and impairs control loop stability.
2.1.2

Cylinder

Design
The cylinder represents the simplest form of a hydraulic linear actuator and can easily be
integrated into the machine guidance system. The cylinder normally has a piston rod at one
end.
Quality criteria
The following are critical quality criteria
● The surface quality of cylinder itself and piston rod
● The seals and guides (low friction, servo quality, ...)
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System Manual, 04/2015, 6SL3097-4BA00-0BP1
Hydraulic Drive