What is the difference between the basic dynamic load rating C and the basic static load rating C0?
An LM System has two types of basic load ratings: basic dynamic load rating (C), which is used to calculate the service life, and basic static load rating (C0), which defines the limit of the static permissible load.
The basic dynamic load rating (C) is used to calculate the service life when an LM System operates under a load.
The basic static load rating C0 is used for calculating the static safety factor relative to the working load.
Basic Dynamic Load Rating C
This refers to the load at which the LM Guide can travel
50 km (ball guide) or
100 km (roller guide)
before reaching the end of its service life.
Basic Static Load Rating C0
This refers to the maximum load that an LM Guide can withstand.
If an LM System receives an excessively large load or a large impact when it is stationary or operative, permanent deformation occurs between the raceway and the rolling element. If the permanent deformation exceeds a certain limit, it will prevent the LM System from moving smoothly.
The basic static load rating is a static load with a constant direction and magnitude whereby the sum of the permanent deformation of the rolling element and that of the raceway at the contact area under the maximum stress is 0.0001 times the rolling element diameter.
With an LM System, the basic static load rating is defined for the radial load.