Does this page calculate a relubrication interval?

No. It calculates only dm=(d+D)/2 and n×dm. Obtain the interval from the current chart or software of the exact bearing and grease manufacturer.

Why is bearing type not a single multiplier?

Manufacturer methods use bearing-family factors together with speed factor, load ratio, grease, temperature and application conditions. A universal type multiplier is not sufficient.

What else is needed for an interval?

Use the exact bearing designation, load or C/P, grease performance and temperature limits, operating temperature, shaft orientation, contamination, vibration, outer-ring rotation and manufacturer-specific instructions.

Free Engineering Tool #052

Bearing Relubrication Planning Data Helper

Calculate mean diameter d_m and speed factor n·d_m for use with the current chart or software of the exact bearing and grease manufacturer.

Verified InputsNo Invented IntervalManufacturer Method Required

Results

Speed Factor n × d_m

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Mean Diameter d_m

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Verified preparatory calculations

d_m = (d + D) / 2

speed factor = n × d_m

SKF’s current public guidance derives relubrication interval from a manufacturer diagram or calculator using bearing factor b_f × n × d_m, load ratio C/P and application conditions. Temperature, vertical shaft, vibration, outer-ring rotation, contamination, bearing size and some cage designs can require different treatment; contamination is not a universal numeric multiplier.

Use the exact bearing designation and grease in the current manufacturer calculation tool, or the equivalent tool/documentation from the selected bearing manufacturer.

The procedures described on this page were developed and field-tested by the Vibromera team using the Balanset-1A, a portable dual-channel balancer and vibration analyzer for on-site rotor balancing.