Friction
Influencing factors
Linear guidance systems have a low, uniform resistance to displacement.
The factors influencing friction are:
- load
- preload
- travel velocity
- lubricant (viscosity and quantity)
- temperature
- misalignment
- the sliding motion components of the seals.
Influence of grease on friction
During commissioning and relubrication, the coefficient of friction increases temporarily due to the fresh grease. After a short running-in period, however, the coefficient of friction returns to its original lower value.
The friction behaviour is determined significantly by the characteristics of the grease used. The consistency and base oil viscosity serve as approximate guide values.
ACHTUNG
Systems have an increased resistance to displacement after initial greasing.
Influence of seals on friction
Contact seals increase the total friction of the linear guidance system.
The seal friction is at its highest in new guidance systems. It decreases after the running-in period.
ACHTUNG
Additional wiper variants (accessories) increase the friction to differing extents depending on the seal design.