Rollico
In systems with two linear guideways and four carriages, a service decision cannot be based solely on the number of damaged components. Maintaining the system geometry, accuracy class and correct carriage arrangement is crucial.
In a critical situation, only two carriages can be replaced.
There is one condition: carriages of the same accuracy class must be arranged diagonally, i.e. across the system. The technical material also indicates that G3 class carriages should be replaced with G0 class carriages, because only G0 can replace carriages of all other classes.
In a system with four carriages, each component affects uniform guidance, load distribution and axis operating accuracy. Therefore, in the case of partial replacement, it is not enough to select a carriage with a higher accuracy class. The correct arrangement of the components must also be maintained.
Carriages of the same accuracy class should form a diagonal. Such an arrangement helps maintain the operating symmetry of the guideways and reduces the risk of uneven loading.
With two guideways and four carriages, components of the same class should be arranged diagonally. This prevents differences in accuracy classes from accumulating on one side of the axis.
Diagram of the diagonal principle: carriages of the same accuracy class should be arranged diagonally.
If the situation is critical, it is possible to replace only two carriages instead of all four.
It is G0 carriages that can replace carriages of other accuracy classes, provided that they are arranged correctly.
Arrange carriages of the same class diagonally so as not to disturb the operation of the guideways.
Carriages on one axis do not operate independently. They form a system that must maintain motion repeatability, guiding stability and even load transfer. If components with different accuracy classes are arranged randomly, local differences in guideway operation may occur.
The service question often concerns whether, in a system with G3 carriages, only some components can be replaced with G1 class. However, the technical material indicates a safer rule: G3 carriages should be replaced with G0, because only G0 class can replace all other classes.
| Situation | Recommendation | Condition |
|---|---|---|
| Failure of two carriages in a four-carriage system | Only two carriages can be replaced | Maintain the diagonal arrangement of accuracy classes |
| Base carriages in G3 class | Replace them with G0 class | G0 can replace any class |
| Replacement without system analysis | Not recommended | Risk of uneven operation and loss of accuracy |
Replacing two carriages instead of four is possible, but only as a conscious service decision. The most important factors are: accuracy class, diagonal arrangement and maintaining the operating symmetry of the entire axis.
Send us the carriage designations, guideway type and system diagram. We will help select a solution that meets the technical requirements of the application.