Requisite minimum load
The correlation between load and service life is less important for applications where there are very light loads. Failure mechanisms other than fatigue often prevail.
To provide satisfactory operation, insert bearing or ball bearing units must always be subjected to a given minimum load. A general “rule of thumb” indicates that minimum loads of 0,01 C should be imposed.
The importance of applying a minimum load increases in applications where there are rapid accelerations or rapid starts and stops, and where speeds are in the region of 75% or more of the limiting speed quoted in the product tables.
The weight of the components supported by the ball bearing unit, together with external forces, generally exceed the requisite minimum load.