Bearing L10 Life

ISO basic rating life from C, P, and speed. Not a prediction of actual service life.

Mechanical & Motion

ISO basic rating life from C, P, and speed. Not a prediction of actual service life.

App id: MECH-15. Reference version 1.0.

How to fill it

Fill the inputs. The tool shows the outputs.

On the tool screen, Calc is the working sheet. Presets stores values you reuse. Reference is the formula, assumptions, and provenance below.

Formula

L10 = (C/P)^p × 10⁶ rev;  p = 3 (ball) or 10/3 (roller)

Inputs

Name	Unit
Dynamic load rating C	`kN`
Equivalent load P	`kN`
Rotational speed	`rpm`
Bearing type (0=ball, 1=roller)	`1`
Required service hours (optional)	`h`

Outputs

Name	Unit
L10 life (hero result)	`h`
L10 (million revolutions)	`1`
L10 revolutions	`1`

Diagnose

Observations are context. They do not pass or fail a structure. See Diagnose.

When	Observation	Severity
`frequency hz < 10`	Very low rotational speed	caution
`frequency hz > 20000`	Very high rotational speed	caution
`p > c`	Equivalent load exceeds dynamic rating	warning
`Required service hours = undefined or not Required service hours > 0 or not Number.is finite(L10 life)`	L10 basic rating life	info
`L10 life < Required service hours`	L10 below required service interval	caution
`L10 life ≥ Required service hours`	L10 meets required service interval	info

Assumptions

Bearing type 0 = ball (p = 3), 1 = roller (p = 10/3).
Constant load and speed. Lubrication and contamination are not included.

Provenance

ISO 281 basic rating life. No a_ISO life modification factors.