Does a satisfactory fatigue-life calculation prove that a bearing can run at the required speed?

LILY Bearing | 2026-10-28

Best answer

Keep the two acceptance questions on separate lines

A rating-life calculation relates capacity, equivalent load and operating duty within its assumptions.

Limiting speed depends on additional features, including bearing design, size, cage, lubrication and sealing. JTEKT provides separate guidance for limiting-speed selection and correction, which is a useful warning against treating a long life result as a universal operating approval. The exact catalog execution matters: a speed value for an open or non-contact-sealed bearing should not automatically be applied to a different sealing or lubrication arrangement. Identify the speed reference and its conditions before comparing it with the required operating speed.

Show an unresolved speed check even when the life column looks good

Use a worksheet with distinct fields for required speed, the applicable manufacturer speed reference, the execution covered by that reference and any required corrections.

A life calculation based on light loading might give a large number of hours while the proposed seal or lubrication arrangement still lacks evidence for the required speed. Mark the speed check unresolved instead of allowing the favourable life value to turn the entire row green. Include any start-up, overspeed or temperature conditions required by the equipment specification. This comparison identifies missing evidence; it does not establish a universal safety margin above or below a catalog speed value.